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Slide Rule Calculators are defined as electronic calculators having the same functions as found on a Basic slide rule with A,B,C and D scales, minimally a multiply, divide and a square root key. Add in square, inverse (CI scale), and Sin, Cos and Tan trig functions and you have what was on Mannheim slide rules defined in 1850. This differentiates them from the four-function (+,-,x,/) calculators first introduced in 1970. Between 1970 and 1972 there were about 100 models of 4-function 'pocket' (some would be considered portable at least) calculators being manufactured or rebranded for the consumer market. When the slide rule calculator was first developed and made available to the common public in 1972, it was only natural to name these very pricey marvels for the tools they were about to replace.
In the July 1968 The Electronic Engineer, authors Hermann Schmid and David Busch wrote about: "An Electronic Digital Slide Rule - If This Hand-Sized
Calculator Ever Becomes Commercial, the Conventional Slide Rule Will Become Another Museum Piece". The article goes on to say: "The Electronic Digital Slide Rule (EDSR) of the future not only will be smaller and easier to operate than the conventional slide rule, but it will also be more accurate.". The slide rule industry should have been paying attention.
What made the portable electronic calculator small enough to be as portable as a slide rule was the inventions of Large Scale Integration (LSI) by Ted Hoff of Intel and Integrated Circuits (ICs) by Jack Kilby of Texas Instruments. LSI/ICs stuffed several thousand transistors and diodes into a small low-power usage package needed for many operations of transendental functions. The Light-Emitting-Diode, so crucial to the miniaturization of the battery powered calculator, was invented in the mid-1960s by the US company Monsanto and marketed together with Hewlett Packard. Subsequent manufacturers of seven-segment displays for electronic calculators included Dialight, Fairchild, Litronix, Motorola and Texas Instruments.
Electronic semi-conductor manufacturers leveraged the 'SLIDE RULE' reference as a way to impart confidence in potential buyers that the new devices would do everything that a slide rule could do, but with more significant figures and automatic decimal point positioning, The advanced scientific slide rules added keys to save key strokes and having to calculate exponents and engineering exponentiation, as well as more memory functions. The cursor on a slide rule is analogous to the Memory keys on a calculator. When shiftable function keys were introduced, with the HP65, the number of functions doubled. You might say this analogous to complex 'duplex' slide rules, which had double the functions of a one-side slide rules.
The two very basic 1976 calculators on the right, a U.S. TI-1270 and a Japanese Canon 8M, both meet the minimum requirements to be a slide rule. The canon has a square root key and memory functions. The TI has square root, square and inverse functions.
Japan, Europe and the Soviet bloc started to produce their own Scientific 'slide rule' calculators (with an 'SR-' prefix) starting in 1976. but were behind in their marketing as compared to HP and TI. Once calculators became ingrained into the mainstream of education and technology for everyday use, the 'SLIDE RULE' tag was dropped in 1976 and 'SCIENTIFIC' or 'ADVANCED PROFESSIONAL CALCULATOR' became the standard model names for these multifunction calculators. Later brochures mentioned 'SLIDE RULE' until the Programmable Versions came out and reference to Personal Computing were being reinforced. By 1978 all conventional slide rules manufacturers were either out of business or switched to making other products than slide rules.
The downside to losing the slide rule, as we knew it, was now one needed to keep
his batteries charged (which was found to be difficult in the field with calculators
having built-in rechargable batteries). A contemporary slide rule can stay functional
for over a century, but calculators can be killed by failed components or corroded
batteries within a decade, although there was a period in the 1930's where celluloid
was first used for cursors and crumbled within 15 years. Since rechargable NiCad
batteries were part of the construction of calculators, users did not remove them
when stored, and many calculators became unrepairable. It wasn't until about
1976 that 9V batteries replaced the NiCads in the calculators, followed by button
cells when Liquid Crystal displays were introduced.
Secondly, and more importantly, a future generation would become numerically illiterate by losing the art of numeracy which was the empetus of the ISRM , with the support of members the Oughtred Society, to create the Slide Rule Loaner Program for Schools.
Most of these specimens, listed in the chronological order of their release to the retail market, have red Light Emitting Diodes (LED) displays or green Vacuum Fluorescent Displays (VFD).
Liquid Crystal (LCD) displays appeared in 1979 after the model names went away from using SR, denoting 'Slide Rule', in favor of 'Scientific', with the exception of the TI SR-40-LCD and some green VFD calculators out of Japan, Taiwan and Hong Kong. This gallery, for the most part, only displays electronic calculators that were marketed as SLIDE RULE CALCULATOR or ELECTRONIC SLIDE RULE or have reference to slide rules in their brochures or manuals. Another exception is the presence of a Square Root key. Texas Instruments held on to the SLIDE RULE tag longer than anyone else and their aggressive marketing lowered prices drastically within 5 years. There were a few Japanese calculator makers who used the SR prefix or suffix to denote a 'Scientific' calculator, but without reference to slide rules. The assumption being is that is why the USA did it in their translation and mimicing of U.S. technology. Other brands used "SR" to denote a 'Scientific' calculator with 'Rechargeable' batteries. Casio was making slide rule calculators for Sperry-Remmington such as the SSR-8 which was the same as the later Casio FX-1 and FX-11. These were rebranded by Tandy Radio Shack as slide rules.
I'll make a couple of exceptions and show calculators that when released were significant moments in history, like the 4- function Casio Mini, the first low cost pocket calculator in 1972. Review this collection of
Articles on the History of Electronic Calculators at xnumber.com. First off ISRM would like to present the oldest
electronic slide rule calculator in the museum, the HP9100A, shown on the right and below.
Hewlett-Packard 9100A Electronic Slide Rule sn816-00447
1968 - $4800.00 ($33,000 in today's money)
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Although far from being a 'pocket' slide rule calculator, the 40 pound (18.1 kg) HP 9100A has the honor of being
the very first Hewlett Packard calculator. This powerful desk top, portable calculator was introduced in 1968 and
the high price made it so only corporate engineering departments could own one. Many engineers stood in line waiting to use it, in place of their slide rule.
Some have called this the 1st personal computer, but it could only be programmed for mathematical operations.
Bill Hewlett said, "If we had called it a computer, it would have been rejected by our customers' computer gurus
because it didn't look like an IBM. We therefore decided to call it a calculator, and all such nonsense disappeared."
The 9100A was the first scientific 'slide rule' calculator by the modern definition (i.e. trig, log/ln, and exponential functions),
and was the beginning of Hewlett-Packard's long history of using reverse Polish notation entry on their calculators.
The vey first paragraph on their sales brochure (3MB PDF) states:"Oriented to the engineering and scientific professions, the new hp 9100A Calculator contains all of the log, trig, and mathematical functions found on complex engineering slide rules - and more!". What is remarkable about the design, it uses NO integrated circuits, just diodes and transistors. The display is a 4" Cathode Ray Tube (CRT) as was used on their famous oscilliscopes. This unit was donated to ISRM by Alexey Davies, Boulder, Colorado, who obtained this in liquidation from his employer, Bell Telephone Labs (later AT&T).
Compucorp 322G 'Micro' Scientist Electronic Programmable Slide Rule
1971-1975 - $795 ($5465 in today's money)
The second important milestone was the development of ICs (Integrated Circuits) by Texas Instruments and made available to VARS (Value Added Re-Sellers).
Compucorp designed what I believe to be the first PORTABLE Electronic Slide Rule in their Model 322 Micro Scientist, with advanced slide rule functions, and like the HP 9100A, was programmable.with two 80-step memories. The introduction in their manual states "The Micro Scientist is somewhat larger than a slide rule, but it's far more powerful and accurate than anything else its size."
This is one of a "300" series of machines for different purposes. The journal "Electronics", for December 6, 1971, on their introduction, said of this series -
"Each machine is "microprogramed" with MOS/LSI logic specifically for each application. ROMs produced by Texas Instruments and AMI to Compucorp specs control the keyboard functions pre-programed by the manufacturer. Groups of calculators bearing family names such as Statistician, Scientist, Accountant, and Treasurer, are thus tailored to the user."
Under their own name and also Monroe, Sumlock, and IME, Compucorp Computer Design Corporation (later part of Wyle Laboratories of El Segundo, California) designed, manufactured and sold high specification electronic and hand-held calculators in the U.S.A. during the late 1960s and early 1970s. This 4 lb ruggedized calculator, with a cast aluminum housing, brought the electronic slide rule into the field. Preffered by surveyors.
The machines included a battery compartment into which either disposable D-cell batteries, or rechargeable Nickel-Cadmium cells could be installed. An external power-pack provided ability to operate on AC power, as well as serving as a charger if NiCad batteries were installed in the machine. Due to the fragile nature of Nixie tube displays, the display technology used in the 300-series machines changed to the new Burroughs Panaplex II seven-segment planar gas-discharge 10+2 digit display. Calculations had a 13 digit precision. The Panaplex display was more durable, less expensive, and could be made smaller to fit within the confines of a 'handheld' device.
More on Compucorp at www.oldcalculatormuseum.com/d-compucorp.html
Donated to ISRM by the Huang Collection.
Note 1: This is an educational historical resource intended for non-commercial use.
All rights belong to the respective on-line sources and publications.
Note 2: If a Placard is shown with a specimen, that indicates that model (or an advertisement) will be shown in the physical exhibit along with the supportive images below,
Note 3: Some of the following images and manuals were provided by various contributing websites for the on-line gallery until we acquire our own specimens or scan the manuals and handbooks in the archives. Please support them. If you need a PDF of a manual not scanned yet, let us know and we'll increase the priority to get it in the queue.
Note 4: We are attempting to build exhibits with physical specimens, so if you have one of these, preferably one that you used in your career, and would like to donate it, we'll add your photo and bio and archive it for posterity. It always makes a specimen more interesting to know who used it. Thanks!
The Electronic Slide Rule Comes Of Age by Nicholas Valery.New Scientist 27Feb1975
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Archaic Tool Daily Times Herald 5April1984
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Compare slide rule scales with their
corresponding calculator keys
Longivity problems for collectors.
On the Left is KERCS (K&E Rotting Cursor Syndrom) found and on the right, corroded NiCad batteries. Either one can make the specimen worthless, especially with claculators, where metal contacts and traces may be dissolved by chemicals in the battery. Many times Cursores may be swapped from one model to another which is more desirable, and battery packs may be re-built with new batteries if the contacts are intact.
Dispay Types
See more about TI Displays
1968 Hewlett-Packard 9100A Desktop Electronic Slide Rule
ISRM would like to thank Joerg Woerner
of datamath.org for his contribution of TI calculator photos, ephemera
and descriptive text as well as his technical advice. ISRM would like to thank David G. Hicks
of hpmuseum.org for his contribution of HP calculator photos, ephemera and descriptive text as well as his technical advice.
ISRM would like to especially thank Scott Reynolds of
Vintage Calculators Inc (760-975-9503) for his technical advice in restoring these slide rule calculators and
for his generous donation of numerous, and rare, calculators for this gallery and exhibit project.
Additionally we'd like to acknowledge the research, documents and images provided by the websites listed below.
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IMAGE
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DESCRIPTION
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LITERATURE
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EXHIBIT PLACARD
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Faber-Castell TR1
Slide Rule w/Calculator
1973 - $unknown
Faber-Castell TR1 (Der erste elektronische Taschen-Rechenstab) made by one of the premier
slide rule manufacturers in Germany, attached has a pocket slide rule to the back of a
similarly shaped four-function calculator. (The same needs I had when I bought the TI-2500 Datamath).
Between the two sides, one could do all arithmetic and transcentental functions required.
This hybrid model made more
sense than the later TR2 as once F-C began to
use the latest Texas Instruments chips there
was a duplication of functions between the
slide rule side and the calculator side. They
used 4 large button cell NiCad 150 DK DEAC batteries with an external charger.
F-C should be commended on their efforts to
adapt to a changing world, but without in-
house technology, they could not compete
once TI started producing their own calc-
ulators. F-C stopped making calculators and
slide rules in 1976 and concentrated on other
products. They are still a worldwide supplier
of quality pencils.
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Manual TBD
Large
Large
Scan of 1974 brochure donated by Dieter von Jezierski, Germany
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WANTED
for Exhibit
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ISRM 13.01.27.06
Exploded View
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Sperry-Remington 809SR sn2110811
December 1973 - $??.??
The mainframe computer company known
as Sperry Rand, famous for the Univac
"Super-Computer" marketed a line of Sperry
Remington Rand calculators in the 1972-
1975 timeframe. This early calculator, a re-
branded Casio 10U, has an 8-Digit VFD
display, powered by 5x AA batteries. It has
a SQRT key which qualifies it as a slide rule
calculator. You might think that 'SR' here
stands for Sperry-Remington, but other than
their SSR-8, no other model uses the suffix.
'SR' could also simlply mean 'Square Root'.
By 1976, Sperry was out of the calculator
market to focus on their computer business.
Like many of their competitors, they found
profits in calculators hard to come by and left
the business to the heavy-weights like TI, HP,
Sharp, and Casio.
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Manual TBD
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Texas Instruments SR-10 Electronic Slide Rule V2 sn505765
November 1973 - $89.95
The second version of TI's first Electronic Slide Rule Calculator (Version 2),
can be identified by the model number being on the faceplate rather than on the LED bezel. There were some cost reductions. The SR-10 had an
X squared and a square root key along with 1/X and could do Engineering notation.
Not as powerful as the HP-35, as there are no trig functions, but it was more
affordable. A third cost reduced version was sold in and through 1975. It removed the 7-segment display drivers and used a new calculator chip.
Used AC Adaptor: AC9200, AC9130
Donated by Jeff Illsman of Longmont, Colorado, who worked for TI at the time this calculator was produced
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Manual (3.2Mb)
V2 Internals
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Commodore Minuteman 3S (MM3S) Mini-Slide Rule Calculator
Mar 1973- $69.95
This relatively compact calculator is one of
Commodore's first models with the basic
slide rule functions of square root and
square. An advertisement touts it as a Mini-Sklide Rule. The major internal components
(CPU, chips and red LEDs) are supplied by
Texas Instruments. Three versions of the
Minuteman 3 exist: the MM3 (4 function
$39.95), the MM3P (with Percentage and
Discount Key $54.95) and the MM3S
(Square and Square root $69.95 - in 1974 $59.95) as shown
here. It has four 2/3AA Nicad batteries
sealed in a 2 row tandem pattern. The
4x5 keyboard has minus and plus keys
doubling up as equal keys. The 3 position
switch has OFF-ON-K. The 'K' position
allows a number to be entered and retained
as a constant for series multiplation and division.
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Manual TBD
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ISRM 12.06.20.xx
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Commodore SR-36 Electronic Slide Rule Calculator sn05329
1973 - £49.95 ($119.88) in 1975 (exhange rate was 2.4)
The SR36, "The advanced electronic press-button slide rule".
was one of the first scientific calculators made by
Commodore with all the slide rule exponential and trig functions.
The CPU is made by MOS Technologies, which
was later bought by Commodore in 1976, and the other
chips and red LEDs are supplied by
Texas Instruments. It has 4x 3/4AA size Nicad batteries mounted in series at 4.8VDC.
It has 36 single purpose keys. The first 1973 version had square
keys with a raised oval, the entire button moved. This 1974
second version just has the oval move and is the
transition to the other SR models. has
The ad on the right was from an February 1975 (old artwork)
New Scientist magazine which shows the square-oval
keys on the upper 17 function keys.
This specimen, found with its original Retail Box and Manual is the only proof ISRM
has that shows that SR in the model number clearly meant SLIDE RULE. Later SR models dropped
the referenece to slide rules in the manuals. By 1976, the term 'slide rule' was
not used in Commodore's advertising or manuals as they were now thinking
ahead toward programmable computers.
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Manual (6.1Mb)
Feb 1975 New Scientist
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ISRM 12.08.15.02
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Hewlett-Packard HP-80 Electronic Business Slide Rule sn1249A-06787
1973 (through 1978) - $395.00
The HP-80 was HP's second handheld calculator. This calculator was designed for business rather than scientific/engineering. There were also slide rules being produced at the time, by K&E and Faber Castell that performed the same financial functions as this calculator. In addition to having different functions, the HP-80 was designed with a different philosophy. Whereas the HP-35 was designed for technical/mathematical users, the HP-80 was designed to be a problem solver that didn't require its users to know the formulas needed. Thus, the user could simply enter the parameters of a business problem and get an answer with a single keystroke. (In other words, the HP-35 user supplied the formulas, but on the HP-80, the calculator supplied them.)
Donated to ISRM by the Huang Collection..
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Handbook to be scanned soon
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Hewlett-Packard HP-45 Advanced Electronic Slide Rule sn1350A-91723
July 1973 - $395.00
The HP-45 was HP's third handheld electronic calculator and the second scientific model. It was the first pocket sized electronic
calculator to have a shift key which doubled the computational power of the
calculator. This is the last HP calculator that has comparisons with slide
rules which is only mentioned in the manual. Early advertising brochures touted the HP-45 as doing "So much more. More than even our first 'electronic slide rule'!" It was sold from 1973-1976.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Handbook to be scanned soon
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Hewlett-Packard HP-35 Electronic Slide Rule V3 sn1249A-04461
July 1973 - $295-$195.00
The middle versions of the HP-35 had the '35' added to the bottom edge label,
and because of the release of the HP-45 the price was reduced by half.
More at MoHPC
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Manual (4.56Mb)
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Hewlett-Packard HP-65 sn1333A-02761
August 1973 - $795.00
This was the first programmable hand-held
calculator and could save programs on
magnetic strips. The HP-65 had up to 4
functions per key and had had 100 lines
of space and used label addressing. It
was the first HP pocket calculator with
base conversions (but only octal and
decimal). It was also the first to directly
perform degrees.minutes seconds
arithmetic (D.MS+ and D.MS-). In 1975
the American astronauts, swapped out
their Pickett slide rules and calculated
critical course-correction maneuvers on
their HP-65 programmable hand-held
during the rendezvous of the U.S. and
Russian spacecraft. The Hp-65 had more
computing power than the spacecraft,
which was designed using 1960 technology.
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Handbook to be scanned soon
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ISRM 13.04.13.01
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Melcor Answermath SR8 Electronic Slide Rule Calculator sn06528
1973 - $??.??
Melcor Electronics Corp. of Farmingdale,
New York (USA) was one of the first US
companies to enter the pocket calculator
business, but they only made
calculators for a few years. This model was
their first with slide rule functions, sqr root,
1/X and X2. It sports 26, square two-color keys with
rounded buttons, a red LED
display which are powered by a 9V battery.
Later models from Melcor were more obvious
in their comparisons with slide rules and had better quality.
This specimen has a lot of switch bounce either because the industry was just learning
to make reliable contacts using printed circuit boards, or simply because it is 30 years old.
More info on Melcor
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Manual (2.6MB)
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ISRM 12.09.26.01
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Melcor Model 400 Electronic Slide Rule Calculator sn21899
1973 - $??.??
Melcor Electronics Corp. of Farmingdale,
New York (USA) was one of the first US
companies to enter the pocket calculator
business, but they only made
calculators for a few years. This follow-on model is identical to the Answermath SR8,
their first with slide rule functions, sqr root,
1/X and X2. It sports 26, square two-color keys with
rounded buttons, a red LED
display which are powered by a 9V battery.
Later models from Melcor were more obvious
in their comparisons with slide rules and had better quality.
This specimen has a lot of switch bounce either because the industry was just learning
to make reliable contacts using printed circuit boards, or simply because it is 30 years old.
More info on Melcor
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Manual (2.6MB)
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Texas Instruments SR-11 Slide Rule Calculator sn085270
September 1973 - $119.95
The SR-11 Slide Rule Calculator was basically an SR-10 that cost less to manufacture.
No trig functions, so you would still have to carry a basic slide rule with you. Even then, the 12 digit red LED display allowed an almost 200 decade range in scientific notation.
The specimen shown here was made in USA, but notice the 'K'
(slide) switch has a shroud. The same calculator made in Italy did not have the shroud,
which hid the opening in the faceplate. The rechargeable batteries would be good for 6 hours continuous use, which could get you through your math classes. Quotes from the 1975 ad "Like a slide rule, the SR-11 goes with you anywhere" and "For most slide rule functions, the new Texas Instruments SR-11 electronic calculator makes the manual slide rule seem fit for the science museum" . Of course that was an accurate prediction. See the TI-30 which made the slide rule calculator cheaper than a slide rule.
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Manual (5.01Mb)
Italy vs USA
New Scientist Pg117 Ad, 18Apr1974
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Bohn Omnitrex SR1 Slide Rule Calculator sn3707791-1
Circa 1973 - >$100
The US company Bohn Rex-Rotary the the past 40 years.
(Div of VLM) distributed desktop
calculators from Contex (Denmark) and
this particular line of electronic calculators,
which was made in Taiwan. This is one of the first Slide Rule Calculators with 9
individual green Vacuum Florescent
Display (VFD) tubes. Page 2 of the
manual claims : "...one of the most
advanced Electronic Slide Rules
available today..." . it is more suited
to the desktop than being a portable like
a slide rule. The archaic semi-RPN logic
and size gave it a short life. The manufacturer was slow on the technology
curve and was soon outmatched by the
more advanced and lower cost products
from TI and others. This specimen is
New in the Box (NIB), and like most
calculators with sealed rechargeable
batteries requires new AA Ni Cads as
these have begun to deteriorate over
the last 40 years.
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Manual (3.34Mb)
Warranty (900Kb)
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18.10.24.12 - Works with 4 AA battery. uses AD-4145 Adaptor
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Casio Root-8S LED Slide Rule Calculator sn 2150133.
Circa 1973 - $??
The Root-8S was the first Casio with a square root key, which puts it in the minimal slide rule catagory.
It uses red LEDs powered by 4 AA batteries and has 18. Production started in 1973 and ended in 1974. It was followed by the Mini-8 series. Internals (Casio Museum)
According to Ron Mackey who was a service manager for Peacock Bros. of Melbourne for the period 1954 through 1975, the Casio Computer Company products were being sold through Peacock & Associates. During this period a Mr. Kawamura was the Australian Agent and the product was marketed through Peacock Bros. as a parallel line to other products. More info: OLD CASIO CALCULATORS
by Ray Mackay
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Manual TBD
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Sperry-Remington 663 V2 sn3041831
December 1973 - $unknown
The mainframe computer company known
as Sperry Rand, famous for the Univac
"Super-Computer" marketed a line of Sperry
Remington Rand calculators in the 1972-
1975 timeframe. This version (see the 1972 version above) calculator has a
6-Digit display that uses a single vacuum
fluorescent tube. It has a shift key for
reading decimal points to the right and the
zero is only half the size of the other
numbers. Some of the same model numbers
can be seen in radically different body styles.
These were built by various Japanese
companies like Casio and Olympus based on
Sperry specifications.
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Manual (1.96Mb)
Warranty (2.25Mb)
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Unisonic 737 Slide Rulette sn027208
Circa 1973 - $unknown
A 4-function calculator that is included simply because of its model name. It has 20 keys and uses 4 AA batteries to power the Vacuum Fluorescent Display (VFD).
Unisonic Products Corporation was an American manufacturer established in 1972 as a distributor of consumer electronics. Although headquartered in New York City, Unisonic outsourced its manufacturing operations to various facilities in East Asia (especially in Hong Kong, South Korea, and Japan). Unisonic developed a variety of electronics, including calculators. Several of their first calculators had the trademark 'SLIDE RULETTE' even though they were missing the minimum requirement of a square root key. As the calculator industry became more competitive, they moved into game consoles and digital watches.
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Manual TBD
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ISRM 13.02.03.01
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Unisonic 738 Slide Rulette sn027208
Circa 1973 - $unknown
A 20 key 4-function with memory calculator
with a model name that identifies it as a slide
rule. This model has the same keys as the
Unisonic 737. Both models use 4 AA
batteries to power the Vacuum Fluorescent
Display (VFD). Unisonic Products Corp
was an American manufacturer established
in 1972 as a distributor of consumer
electronics. Headquartered in New York City,
Unisonic outsourced its manufacturing
operations to various facilities in East Asia
(especially in Hong Kong, South Korea, and
Japan). Unisonic developed a variety of
electronics, including calculators. Several of
their first calculators had the trademark
'SLIDE RULETTE' even though they were
missing the minimum requirement of a
square root key. As the calculator industry
became more competitive, they moved
into game consoles and digital watches.
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Manual TBD
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Citizen 820SR Slide Rule Calculator sn406-13482
Circa 1973 - $unknown
This slide rule calculator was made by the
Citizen Watch Company (parent Citizen
Holdings Co., Ltd.) is a Japanese
manufacturer of electronics, components,
and in particular, watches. It has its
headquarters in Nishi-Tokyo-shi, Tokyo.
It was founded in 1918 as the Shokosha
Watch Research Institute, and Citizen
Watch Co., Ltd. itself was established in
1930. In the early 1970s, Citizen began
to manufacture pocket calculators, which
were widely used throughout Asia and
Europe. Their biggest success was in the
making of digital watches which better
matched their original corporate mission,
as there was less competition in that
arena.They were already accustomed to the slide rule industry
as they made chronograph watches with logarithmic scales. (Tachyometers).
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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ISRM 12.04.10.02
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Texas Instruments SR-10 Version 2 sn505765
1973 - $89.95
There were internal changes and the SR-10 label moved from the display to the keyboard bezel.
Major retail price reductions occurred in anticipation of the SR-50 release.
Donated to ISRM by Jeff Illsman, Longmont, Colorado
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App Guide (3Mb)
OM US Manual (3.89Mb)
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Litronix 2260 Slide Rule V1 sn52333
1973 - ~$100
Litronix, Inc., (Cupertino, CA) was an early
light-emitting diode (LED) company that
became a leading supplier of displays for
handheld calculators and digital watches
(e.g. the Hamilton Pulsar line).
Litronix Malaysia Sdn Bhd located in
Penang was established in March 1972
with 7-segment light-emitting diode (LED)
displays as initial products. Within a few
years, the company expanded its product
base into LED related consumer products
such as LED watches, calculators and
LED games. Litronix Malaysia was
purchased by Siemens in 1976. This
'slide rule' model was an early version
with tan case and small LED display.
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Manual TBD
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Commodore 774D Electronic Calculator sn17034
1973 - $??.??
The 774D four-function Electronic Calculator, assembled in USA is one of Commodore Business Machines
early entries into the calculator market. It is much more compact that the rival Texas Instruments TI2500B
and easily fits in a shirt pocket. It has red LEDs from TI and uses a 9V disposable battery.
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Manual TBD
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Commodore 798D Electronic Calculator sn17102
1973 - $??.??
The 798D Electronic Calculator, assembled in USA is one of Commodore Business Machines
early models with the minimum slide rule function of a square root key. It is as compact and narrow as the
774D above, but is longer because of the additional keys and easily fits in a shirt pocket.
It has red LEDs from TI and uses a 9V disposable battery.
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Manual TBD
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Team Electronics Ad Nov 1974, New Scientist Magazine
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Nortex-Electronics Ad Nov 1974, Texas Monthly Magazine Shows TI SR-11 and TI-2500, Corvus 411 & 322, Bowmar MX100, Sharp EL-122
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The Brown And White, Lehigh, University, Bethlehem, PA April 1974
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Radio Shack Ad, The Morning Record, Meriden, Connecticutt, Nov14, 1974 - shows EC-400 and EC-425
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Texas Instruments SR-11 Elect Slide Rule, New Scientist Pg117 Ad, 18Apr1974
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Casio Sales Brochure 1974. Germany.(pdf)
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New Scientific PocketCalculators Article By John Free, Popular Science Pg124-125, Apr1974
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Casio FX-10 $99.95 May 1974
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Casio Mini-Generation May 1974
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Popular Mechanics Dec 1974 Calculators Get Smaller By Ivan Berger
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Radio Shack 1974 Catalog Page 67 shows EC-200
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Radio Shack 1974 Catalog Page 66 shows EC-300
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Casio Mini-Generation May 1974
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Casio ad model FX-11 (Epocalc)
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Casio 8A Memory Germany Ad (Epocalc)
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Casio Mini and Mini-Memory Germany Ad (Epocalc)
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Casio FX-10 and Personal 8 (Epocalc)
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Ulrich's HP Calculator Ad_HP-35,45, 65, 70, 80, 46, 81. - The Michigan Daily, September 1974
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Highland Appliance Calculator Ad. Corvus 310 Slide Rule, TI SR-10.- The Michigan Daily,September 1974
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Highland Appliance Calculator Ad Corvus 310 Slide Rule - The Michigan Daily, September 1974
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University Cellar Bookstore Calculator Ad. Corvus, TI, HP, Kingspoint, Casio. - The Michigan Daily, Sept 1974
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Playback Calculator Ad.TI SR-50, TI-1500, TI-2550, Exactra 20 - The Michigan Daily, December, 1974
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JS&A National Sales Group. ICP-537 Electronic Slide Rule - The Michigan Daily, March 1974
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Meijer Thrifty Acres. Unitrex Deluxe Slide Rule Calculator - The Michigan Daily, April 1974
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Playback's Calculator Ad. LLoyds Accumatic, TI SR-10, Sinclair Scientific - TheMichiganDaily, September 1974
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Playback's Calculator Ad. TI-2550, TI-1500, SR-50, SR-10, SR-11, Corvus 411, Sinclair - The Michigan Daily, October 1974
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Playback's Calculator Ad. Novus 850, Corvus, TI SR-10,TI Exactra21,Casio Mini - The Michigan Daily, December 1974
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Lafayette Electronics Calculator Ad.TI-1500, SR-10 - The Michigan Daily, September 1974
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Heathkit IC-2100 ad. "At last, A slide rule calculator big enough to use", November 1974
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Heathkit IC-2100 Schematic, Assembly Instructions.(PDF)
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Heathkit IC-2009 Calculator with Desk Set
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Olson Electronics Catalog 1974 pg099
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Olson Electronics Catalog 1974 pg100
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Olson Electronics Catalog 1974 pg101
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The American Jewish World Volume 63 Number 16, December 13, 1974 Texas Instruments Electronic Slide Rule Calculators
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Electronic-Design V22 Sep 18, 1974 Rockwell Unicom 202 Slide Rule Calculator Ad
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IMAGE
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DESCRIPTION
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LITERATURE
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EXHIBIT PLACARD
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ISRM 12.09.24.01
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Faber-Castell TR2 Slide Rule w/Calculator sn0251209109
Circa 1974 - DM148
Faber-Castell TR2 (Der erste elektronische
Taschen-Rechenstab) made by one of the
premier slide rule manufacturers in Germany,
attached has a pocket slide rule to the back
of a similarly shaped 'slide rule' calculator
with exponential functions. The first attempt
at a hybrid was with the 1973 TR-1 which was
only four functions. That model made more
sense than the TR2 as once F-C began to
use the latest Texas Instruments chips there
was a duplication of functions between the
slide rule side and the calculator side. They
used 4 large button cell 150 DK DEAC NiCad batteries.
F-C should be commended on their efforts to
adapt to a changing world, but without in-
house technology, they could not compete
once TI started producing their own calc-
ulators. F-C stopped making calculators and
slide rules in 1976 and concentrated on other
products. They are still a worldwide supplier
of quality pencils.
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Manual TBD
1975 Ad
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ISRM 13.01.27.15
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Corvus 310 Calculator sn310-151267
July 1974 - $??.??
Corvus was the consumer division of the IC
manufacturer MOSTEK. They introduced the Model
310 a basic four-function calculator with 20 keys
including a square-root and percent key. It uses
their MS5020A calculator circuit powered by 4AA
batteries.to drive a red LED module made by
Hewlett-Packard.
MOSTEK was founded in 1969 as a spin-off of Texas Instruments and engaged in the manufacturing and marketing of Metal Oxide Semiconductors and Large Scale Integration (MOS/LSI) integrated circuits. Already in May, 1970 MOSTEK started the development of the MK6010, the world's first "single-chip" calculator circuit for for Nippon Calculating Machine Company, better known under the brand Busicom.
More about MOSTEK at Datamath.org
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Manual (4.5Mb)
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ISRM 18.10.24.18
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Corvus 411 Slide Rule Calculator With Memory
Sept 1974 - $89.95
Corvus was the consumer division of the IC
manufacturer MOSTEK. As part of their initial line-up, they introduced this
Slide Rule With Memory with 24 keys which had SQRT
PI, 1/X, EE, and memory functions. It uses
their MK50310N calculator circuit chip powered by 4AA
batteries.to drive a red LED module made by
Hewlett-Packard. This is a great example of a 'slide rule'
as it was printed on the cover of the manual:
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Manual (883Kb)
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Heathkit IC-2100 Electronic Slide Rule
c1974 - $119.95
"You can walk into just about any department store and buy a wired calculator with the transcendental functions (sine, cosine, arc sine, etc.) for $50 to $120. Essentially the same functions are found in Heathkit's IC-2100 Electronic Slide Rule which sells for $119.95 in kit form." More at decodesystems.com
This is a desktop AC powered Slide Rule calculator with 14 functions (+,-,x,/,sqrt, pi,%,+/-, etc, sin, cos, tan) with memory, 27 keys, 2 rocker switches and a large display.
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ISRM 18.10.24.08
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Kings Point SPM-100 Electronic Slide Rule
1974
This is a called a slide rule calculator with 22 keys and 2 switchs. Arithmetic functions with memory .It has a red Light Emitting Diode (LED) display,and is powered by 4 replacable AA batteries, but can also be powered by their Model 616 AC adaptor.
Kings Point is also sold under the brand names Realtone, MBO, ELCON, EMAIL, and EMONA.(see ELCON/EMONA advertisment for model number.
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Manual TBD
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ISRM 18.10.24.08
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Kings Point SC-11 Electronic Scientific (Slide Rule)
1974
This is a full scientific sliderule calculator with 20 keys with a function key to provided 38 functions. It can compute complex problems utiling memory, sum of products, product of sums, reciprocals, squares and Nth root.It has a red Light Emitting Diode (LED) display,and is powered by replacable batteries, but can also be powered by their Model 616 AC adaptor.
Kings Point is also sold under the brand names Realtone, MBO, ELCON, EMAIL, and EMONA.(see ELCON/EMONA advertisment for model number.
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Manual TBD
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ISRM 18.10.24.21
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Kings Point SC-40 Electronic Scientific (Slide Rule)
1974 - $69.95(1975)
This is a full scientific sliderule calculator with 39 keys. It can compute complex problems utiling data hold, reciprocals, squares and Nth root.It has a red Light Emitting Diode (LED) display,and is powered by non-replacable NiCad batteries, but can also be powered by their Model 616 AC adaptor. The 3 internal NICads were replaced, but the calculator failed to come on line.
Kings Point is also sold under the brand names Realtone, MBO, ELCON, EMAIL, and EMONA.(see ELCON/EMONA advertisment for model number.
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Manual TBD
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ISRM 18.10.24.09
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Kings Point SC-44 Electronic Scientific (Slide Rule)
1974
This is a full scientific sliderule calculator with 40 keys. It can compute complex problems utiling memory, sum of products, product of sums, reciprocals, squares and Nth root.It has a red Light Emitting Diode (LED) display,and is powered by non-replacable NiCad batteries, but can also be powered by their Model 616 AC adaptor. It has an expanded memory function as compared to the SC-40 and different colors.
Kings Point is also sold under the brand names Realtone, MBO, ELCON, EMAIL, and EMONA.(see ELCON/EMONA advertisment for model number.
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Manual TBD
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ISRM 13.02.03.02
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Litronix 2140 Slide Rule Calculator
1974 - $??.??
This 'slide rule' model was an early version
with brown case and small LED display powered by 3 AA
disposable batteries. It has all the minimum
slide rule capabilities,, 1/X, X^2, SQRT, +/-,
plus memory, less trig functions. This is
otherwise a direct competitor to the TI SR-10. The
Litronix 2240 would be released with the same
layout but would be called 'Scientific'
or "slide rule'.
Litronix, Inc., (Cupertino, CA) was an early
light-emitting diode (LED) company that
became a leading supplier of displays for
handheld calculators and digital watches
(e.g. the Hamilton Pulsar line).
Litronix Malaysia Sdn Bhd located in
Penang was established in March 1972
with 7-segment light-emitting diode (LED)
displays as initial products. Within a few
years, the company expanded its product
base into LED related consumer products
such as LED watches, calculators and
LED games. Litronix Malaysia was
purchased by Siemens in 1976.
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Manual TBD
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ISRM 18.10.24.03
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Lloyds Accumatic E999 Slide Rule Calculator sn103139
1974
This is a full scientific slide rule calculator with 20 keys, which has a function key to double the functions making 38 keys. It can compute complex problems utiling memory, sum of products, product of sums, reciprocals, squares and Nth root.It has a green VFD display,and is powered by 4 AA batteries. The batteries were replaced, but the calculator failed to come on line.
This unit came in its original retail box
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Manual TBD
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Texas Instruments TI-2550 Memory Calculator sn036897
January 10, 1974 - $99.95
Roughly one year after the introduction of the famous
TI-2500 alias Datamath the engineers at Texas Instruments added a full memory onto
the calculator chip. Integrated into a housing similar to the wedge shape of the
SR-11 it was named TI-2550. It uses TI power adaptor AC9130 with 3 AA nicads or
4 AA alkaline batteries. A close relative of the TI-2550 was sold through the
American department store Montgomery Ward. Compare the TI-2550 with the P200.
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Manual (2.7Mb)
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Montgomery Ward P200 sn47X-035014
1974 - ~$79.95
The P200 could be easily identified as a close relative of the TI-2550. Both calculators
use the same electronics, the same layout of the keyboard and even an identical mold for
the housing bottom. The different look is achieved through a new mold for the upper half
of the housing and a different style of the memory keys. The color of the housing is
slightly different, too. This has a Texas Inst. model number TXI-8662A. It uses TI power
adaptor AC9130 with 3 AA nicads or 4 AA alkaline batteries.
Donated to ISRM by Scott Reynolds, Vintage Calculators Inc. Hemet, CA
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Manual (2.45Mb)
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Aristo M36 Electronic Slide Rule sn2L013-0441
1974 - $unknown
Dennert & Pape (Aristo) was one of the world's premier suppliers of slide rules in Germany,
and after reading the writing on the wall, stopped slide rule production and created their
own line of electronic slide rules. The M36 is the 2nd calculator, and the 1st of their own
design. It does not have any slide rule or transcendental functions but it was the start of
an entire product line. This Basic 4-function calculators competited against the TI-2500 and
others like it while they developed more complex calculators. It has red LED's from
Hewlett-Packard and uses 3 AA batteries.
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Manual TBD
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Aristo M65 Electronic Slide Rule snF2LT04-0359
1974 - $unknown
Dennert & Pape (Aristo) was one of the world's premier suppliers of slide rules in Germany.
They stopped slide rule production and created their own line of electronic slide rules.
The M65 is their own 2nd generation design, thinner and trimmer than all the other makers
slide rule calculators. It has the basic slide rule functions (Square root, 1/X, X squared)
accessible via a function key and competes against the Texas Instrument SR-50. It has
red LED's from Hewlett-Packard and uses 3 AA batteries.
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Manual TBD
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Radio Shack EC-425 Electronic Slide Rule sn026912
November 1974 - $79.95
The Radio Shack (Tandy Corp) EC-425 is
easily identified as a close relative of the
TI SR-10, as is the Montgomery Ward P300.
Both calculators use the same electronics,
the same layout of the keyboard and even
an identical mold for the housing bottom.
The different look is achieved through a
new mold for the upper half of the housing,
shared with the Ward P300, and a different
color of the function keys. The color of the
plastic is different . It uses TI power adaptor
AC9130. The early release of the EC-425
occured just in time for Christmas of 1974
in newspaper ads with at a sale price of $69.95,
but did not appear in the RS catalog
until 1975, with catalog number 65-632.
This model did not appear in the 1976
RS catalog as Tandy went with other
slide rule calculators made by Commodore
and Rockwell which had better pricing.
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Manual (3.6Mb)
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Montgomery Ward P300 Slide Rule Calculator sn47X-026332
1974 - ~$99.95
This Montgomery Ward P300 aka TXI-8663A is another a close relative of the TI SR-10, as is the Radio Shaeck EC-425.
Both calculators use the same electronics, the same layout of the keyboard and even an identical mold for the housing bottom. The different look is achieved through a new mold for the upper half of the housing, Shared with the Radio Shaeck EC-425, and a different color of the function keys. The color of the housing is slightly different,too. It uses TI power adaptor AC9130.
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Manual TBD
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ISRM 12.04.10.04
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Texas Instruments SR-50 sn0447926
January 1974 - $169.95
The SR-50 Slide Rule Calculator finally has trig functions and a couple more keys for doing logarithms and
fractional exponents. This starts a calculator pricing war with HP as this much less than
the cost of an equivalent HP-35. The algebraic method, using the equal sign, is more
comfortable with the buying public, than HP's RPN. By March of 1975 manufacturing
costs are reduced bring it to $109.50.
Donated to ISRM by Jeff Illsman, Longmont, Colorado
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Manual (5.45Mb)
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Commodore SR-1400 Electronic Slide Rule Calculator(Metal Fascia)
1974 - $99.95
This is Commodore's first scientific model which introduced nomenclature that Commodore
used for most of these types: the "SR" prefix indicates a scientific model with slide rule functions.
This calculator, which came in two faceplate variations, this one shows the bright metal fascia. One key is devoted to each function, so the user is faced with nearly 40 keys. This abundance of keys and functions beacame a
trademark of Commodore's advanced models. This one sports red LEDs. Photo of specimen from the National Museum of Math History.
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Ebay Photo
Manual TBD
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Commodore SR-1400 Electronic Slide Rule Calculator
1974 - $99.95
This is Commodore's first scientific model which introduced nomenclature that Commodore
used for most of these types: the "SR" prefix indicates a scientific model with slide rule functions.
This calculator, which came in two faceplate variations, devotes one key to a function,
so the user is faced with nearly 40 keys. This abundance of keys and functions beacame a
trademark of Commodore's advanced models. This one sports red LEDs.
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Ebay Photo
Manual TBD
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Unisonic 1212 Slide Rulette sn027208
Circa 1974 - $unknown
A 4-function calculator that is included simply because of its model name. Unisonic Products Corporation was an American manufacturer established in 1972 as a distributor of consumer electronics. Although headquartered in New York City, Unisonic outsourced its manufacturing operations to various facilities in East Asia (especially in Hong Kong, South Korea, and Japan). Unisonic developed a variety of electronics, including calculators. Several of their first calculators had the trademark 'SLIDE RULETTE' even though they were missing the minimum requirement of a square root key. As the calculator industry became more competitive, they moved into game consoles and digital watches.
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Manual TBD
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Litronix 2250 Slide Rule sn101345
1974 - ~$100
Marked as being a 'Slide Rule', this calculator was made by Litronix, Inc., (Cupertino, CA), an early
light-emitting diode (LED) company that
became a leading supplier of displays for
handheld calculators and digital watches
(e.g. the Hamilton Pulsar line).
Litronix Malaysia Sdn Bhd located in
Penang was established in March 1972
with 7-segment light-emitting diode (LED)
displays as initial products. Within a few
years, the company expanded its product
base into LED related consumer products
such as LED watches, calculators and
LED games. Litronix Malaysia was
purchased by Siemens in 1976.
In comparison with the 2260, the 2250
has parenthesis '(' and ')' keys in place of
memory keys 'RM' and 'M'
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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Litronix 2260 Slide Rule V2 sn50001
1974 - ~$100
This is an updated model of the Litronix
(Cupertino, CA) 2260 slide rule. Compare
with the tan versionreleased in 1973. This
'slide rule' model late version has a
brown case, with shrouded keys and
an LED display with digits twice the size.
Of particular interest, this specimen has
serial number 50001, the first in this series.
Litronix, Inc., (Cupertino, CA) was an early
light-emitting diode (LED) company that
became a leading supplier of displays for
handheld calculators and digital watches
(e.g. the Hamilton Pulsar line).
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Manual TBD
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Litronix 2280 Memory II sn103670
1974 - ~$100
This is four-function calculator with
expanded memory functions by the Litronix
company. It has the same packaging as
the late 2260 slide rule model with a brown
case, shrouded keys and a large LED digits.
display with digits twice the size.
Although there are no slide rule functions,
it is a good example of how companies
maximize tooling across product lines.
Litronix, Inc., (Cupertino, CA) was an early
light-emitting diode (LED) company that
became a leading supplier of displays for
handheld calculators and digital watches
(e.g. the Hamilton Pulsar line).
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Manual TBD
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Berkey 4030 Slide Rule Calculator sn0247165
1974 - $unknown
This USA made slide rule calculator by
Berkey Photo Inc, was the most advanced
of the other known related specimens from
1972, the Berkey-Omega 100, Berkey-
Keystone 88 and 350 and Atlas-Rand 240
which were limited to 4-functions. Berkey
calculators all use a Rockwell CPUs and a
Burroughs Panaplex II amber gas-discharge
display, normally only found in desktop
calculators. The Rockwell chip in this unit
has a 7423 date code
Berkey has been a camera manufacturer since
its 1966 acquisition of the Keystone Camera
Company, a producer of movie cameras and
equipment. In 1968 Berkey began to sell
amateur still cameras made by other firms,
and the following year the Keystone Division
commenced manufacturing such cameras itself.
In 1972 they tried entering the new calculator
market but lasted only until 1974.
From 1970 to 1978, Berkey accounted for a tenth
of the sales in the camera market in the United
States,. In 1978, Berkey sold its camera division
and thus abandoned this market.
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Manual TBD
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Rockwell 30R Slide Rule Memory sn221837
Circa 1974 - $unknown
This calculator, which has 'Slide Rule Memory' on the front edge,
appeared to have been issued to a North American Rockwell (as U.S. company)
employee as it has an asset tag on the back. Made in Great Britain by Rockwell
International, Microelectronic Product Division. It uses a 9.0V DC battery.
The display is an 8 digit red LED with bubble lens and ninth digit for minus sign
and has four functions with percentages and four function memory. Register exchange,
change sign, inverse, squares and square roots. The only thing missing to make it a
perfect slide rule is a Pi key, but most technical people can remember 3.14159
which is all the accuracy anyone needs.
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Manual TBD
 Box Cover
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ISRM 13.01.27.24
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Rockwell 31R Slide Rule Memory sn151267
Circa 1974 - $unknown
This calculator, which has 'Slide Rule Memory' on the front edge, the same as the 30R, which was made in England.
The 31R, however was assembled in Mexico, with US and Foreign parts, by Rockwell
International, Microelectronic Product Division. It uses a 9.0V DC battery.
The display is an 8 digit red LED with bubble lens and ninth digit for minus sign
and has four functions with percentages and four function memory. Register exchange,
change sign, inverse, squares and square roots. The only thing missing to make it a
perfect slide rule is a Pi key, but most technical people can remember 3.14159
which is all the accuracy anyone needs.
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Manual (6.0Mb)
Cover
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Rockwell 61R Advanced Slide Rule sn163764
Circa 1974 - £29.95 (Nov 1975)
This calculator, which has 'Advanced Slide Rule' on the front edge,
was made in Great Britain by Rockwell
International, Microelectronic Product Division. It uses a 3.6V NiCad battery pack with a 6V charger.
The display is an 8 digit blue VFD (Vacuum Flourescent Display) with a ninth digit cluster for minus sign and error indications.
It has a shift keys and four function plus logs, trigs, powers, square root, change sign, register exchange, reciprocal, pi, data recovery and six function memory. Degree / radian switching. This one, unfortunately is INOP.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
Landau Radio Ltd. Ad
Nov1975 New Scientist
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ISRM 12.04.10.34
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Sears Electronic Slide Rule, sn214649 (V1)
Circa 1974 - $unknown
Sears and Roebuck ESR model 801.58770 was designed in the USA and has the same keyboard layout
(and most likely the same circuit board) as the Rockwell Model 61R. It is an algebraic scientific calculator
with 40 functions using 20 keys with a switch for radians or degrees. It uses 4 AA batteries. This specimen was assembled in Mexico.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual (960kb)
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ISRM 12.04.10.33
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Sears Electronic Slide Rule II, sn123528
Circa 1974 - $unknown
Sears and Roebuck ESR model 801.58780 was designed in the USA and has the same keyboard layout
as the model 801-58770 but with reduced basic slide rule functions. It is an algebraic scientific calculator
with 30 functions using 20 keys with a switch for radians or degrees. It uses 4 AA batteries and drives a green VFD readout. This specimen was assembled in Mexico.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual (4.26Mb)
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Sears 10M, sn216498
Circa 1974 - $unknown
Sears and Roebuck 10M model 728-5825
was made in USA and was made by
Rockwell. It is an algebraic calculator with
the basic slide rule and memory functions. It has 3 AA
rechargable nicads inside and requires an
external charger. This specimen was made in the USA.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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Silver-Reed SR80 (Version 2) sn00007602
1974 - $unknown
Silver Reed Ltd. began operations as
Marukoshi Knitting Machines Ltd. in Tokyo
in the 1950s and in 1967 the company name
was changed to Silver Seiko Ltd. It claims to
be the first company to sell electronic home
knitting machines as early as 1977, and, as
as their technology, began selling rebranded
calculators and electric typewriters. The
SR80 has the minimal slide rule function of a
sqr root key. the 1st version of the SR80's
did not have it. It is most likely that the prefix
'SR' stands for 'Silver Reed', as another
model, the SR82S (see example), has 'Slide Rule' printed
on the faceplate. The suffix 'S' must stand for
Scientific or Slide Rule, and the prefix 'SR' for
the company intitials. This calculator uses
2 AA batteries driving a green VFD display.
The instructions on the back are in German.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
SR82S SlideRule
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REF
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Casio FX-10
May 1974 - $99.95
Casio, in Japan, released their first personal scientific calculator with
slide rule functions in a pocket device. Soon
after other models would follow.
The FX-10 is one of the early scientific slide rule
hand-held calculators using an 8
digit Vacuum Fluorescent Display VFD .
It is physically
identical to the Sperry Rand SSR-8 Scientific
Slide Rule of that period, with different
colors.
In 1975, Casio was one of the first companies to
make calculators with LCD displays, the Pocket-LC,
but VFD were made trhrough 1976
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Manual TBD
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Sperry-Remington SSR-8 Scientific Slide Rule sn8021122
May 1974 - $99.95
One of the early scientific slide rule
hand-held calculators using an 8
digit Vacuum Fluorescent Display VFD .
The mainframe computer company
known as Sperry Rand marketed a
line of Sperry Remington Rand
calculators in the 1972-1975 time
frame, all made in Japan. It is physically
identical to the Casio FX-10 Scientific
Calculator of that period, with different
colors.
By 1976, Sperry abandoned the
calculator business to focus on
their computer business.
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Manual TBD
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Texas Instruments SR-16 Slide Rule Calculator sn038211
October 1974 - $99.95
The SR-16 Slide Rule Calculator, used the packaging size of the SR-10 but had extra keys for doing
logarithims and fractional exponents, but no trig functions. Its novelty was quickly outmoded when the
SR-50 was released 3 months later. The SR-16 is considered a rarity amongst collectors.
It would return again in a year as the SR-16-II in a cheaper package.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual (4.4MB)
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ISRM 13.07.02.01
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APF Mark 23 Electronic Slide Rule Calculator snJ-019752
1974-1975 - $??
The APF (U.S. company) MARK 23 Electronic Slide Rule Calculator is an arithmetic calculator with 8 digits precision and algebraic logic. It has 9 functions, 20 keys and a VFD (vacuum fluorescent) display in a single tube. The power source is sealed battery pack using 3 AA NiCads, chargeable with a 4.5 DC source. The calculator was manufactured in Japan.
This specimen was found in its original retail box with a J.C. Pennys price tag on it. It is a another unique example of an electronic calculator being marketed for the slide rule users.
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Manual (1.39MB)
Manual Cover
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Sears Digi-matic SR-8 sn02261
1974- <$100
The Sears SR-8 Slide Rule Calculator is a with 8 digits precision and algebraic logic. It has 9 functions using 20 keys, all the functions required of a slide rule, and a VFD (vacuum fluorescent) display. The power source is sealed rechargeable NiCad batteries. This may have been manufactured by Bowmar - the inventor of the first "True-Pocket-Size" calculator, and assembled in Mexico.
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Manual TBD
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Rockwell 202 slide Rule sn176657
1974 - >$100
There is no doubt that this was 'slide rule'
calculator with the printing on the display
bezel. This classic Rockwell design is a little
larger than most with 21 functions, 20 keys
on 21 pivoting keys in the normal Rockwell
colors. It has an 8+2 digit blue VFD display
with a ninth digit (and intervening one) for
the minus signs. Display input starts at the
left rather than the normal right. The power
source is four AA disposable Alkaline or
rechargeable NiCad batteries. It was
assembled in Mexico.
This is one of the first true Rockwell
calculators. Although they had made
ICs from the very early days it wasn't
until Rockwell bought Unicom (in 1972)
that they started their own brand.
These "Transition Models" are renamed
Unicom calculators.
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Manual (4.73Mb)
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Melcor SC-535 Electronic Slide Rule Calculator sn39340
1974 - $89.95
Melcor Electronics Corporation of Farmingdale, New York (USA) was one of the
first US companies to enter the pocket calculator business. Like Bowmar, they were
known for quality products but only made calculators for a few years.
The first Melcor instruction manuals had a the picture of a Pickett slide
rule on the cover (see the SC-635 and 645 examples).
The SC-535, the first of the Scientific Calculators, has 18 functions, 37 keys and an 11 digit 7 segment LED
(light-emitting diode) display. In order to provide more calculating time the first units had double the battery storage of later units.
The power source was a pair of in-line sealed battery pack which was charged with an external DC 7.5V power supply.
Each pack consists of 3x 1.5V cells and apparently the packs are connected in series. It was discontinued in 1975 when it was replaced by the SC-635, which only used one of the battery packs.
More info on Melcor
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Manual TBD
Team Electronics Ad, Nov 4,1974,Lawrence-Journal, Louisiana
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ISRM 12.09.12.01
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Melcor SC-635 Electronic Slide Rule Calculator sn653172
1974/1975 - >$49.95 kit ($69.95 Assembled)
There is no doubt that this was a 'slide rule'
alternative with the picture of the Pickett on the cover of the manual.
Melcor Electronics Corporation of Farmingdale, New York (USA) was one of the
first US companies to enter the pocket calculator business. Like Bowmar, they were
known for quality products but only made calculators for a few years.
To save money you get it in a kit and solder your own components.
The SC-635 came out with a math error
(just like the first HP-35) but it was not found
until 50,000 units were produced. These
were sold in 1975 at a discount and the
corrected chip versions went to $99.
The SC-635 has 26 functions, 40 keys and an LED
(light-emitting diode) display, typical of calculators of this era.
The power source is a unique in-line sealed battery pack
consisting of 3x 3/4 size 1.2V Batteries.
More info on Melcor
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Manual (3.07Mb)
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Sinclair Scientific Electronic Slide Rule Calculator
April 1974 - >$29.95 kit ($69.95 Assembled)
This VERY SMALL calculator, designed
by Clive Sinclair has 18 keys with 12
functions on a simple keyboard. It uses
scientific notation having a 200 decade
(step) range using reverse Polish notation
(RPN). The red LED display has a5 digit
mantissa, with 2 digit exponent, powered
by 4 AAA batteries. This unit was offered
in a kit form (like the Melcor calculator line).
For people in Britain in the 1970s and 1980s
Clive Sinclair was known as "the inventor of
the pocket calculator". To reduce power
consumption he used a method of pulsing
the power to Texas Instruments chip every
1.7 microseconds to keep the operations
alive using the internal capacitance to
store the charge.
More info on the Sinclair Scientific Kit
Clive Sinclair and the Pocket calculator
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Manual TBD
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Mintron ESR-817 Electronic Slide Rule sn4065619
1974-1975 - $ ?
Mintron Electronic Slide Rule by Minsung Electronics, Ltd, Seoul, Korea. This specimen has
'SR' in the model name as well as saying 'Electronic Slide Rule' on the back label. It has
9 individual 7-segment LEDs, a rare design as cost reduced LED arrays and VFD's were
already becoming popular, and is powered by 4 2/3AA NiCd batteries. Fortunately, it
can use a Canon AC adaptor to charge the batteries, which have been replaced by new 400mAh NiCds.
The internal MOS chips have a date code of 1974. This model was acquired out of the UK, which
was the intended market, and refurbished by the curator.
,
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Manual TBD
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ISRM 13.01.27.27
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Unisonic 767 Electronic (Slide Rule) Calculator sn179220
1974-1975 - $ ?
The 767 is a basic four function calculator
with a SQRT key which qualifies as a slide
rule. It is more suited for the a desktop,
but that was most likely the designer's intent.
Smaller calculators with the same styling,
such as the Unisonic 1011, were produced at
the same time as the Unisonic 767,
so buyers did have a choice.
Aluminum sheet metal is used to trim over
the plastic with the goal of making these
look classier to an executive. The 767
has a green VFD display powered
by 4 C size batteries.
Unisonic Products Corporation was an
American manufacturer established in 1972
as a distributor of consumer electronics.
Their first calculator versions were called
'SLIDE RULETTE'.
Unisonic 767 vs 1011 packaging sizes.
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Manual TBD
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ISRM 13.01.27.26
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Unisonic 1010 Electronic (Slide Rule) Calculator sn179220
1974-1975 - $ ?
The 1011 is a basic four function calculator
with a SQRT key which qualifies as a slide
rule. This unit has the same styling as the
Unisonic 767, but it is only half the size.
Aluminum sheet metal is used to trim over
the plastic with the goal of making these
look classier to an executive. Both the 767
and 1011 have green VFD displays powered
by 4 batteries, but the 1011 uses AAA's while
the 767 uses C's. The 1011 is obviously more
portable.
Unisonic Products Corporation was an
American manufacturer established in 1972
as a distributor of consumer electronics.
Their first calculator versions were called
'SLIDE RULETTE'.
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Manual TBD
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Scientific Slide Rule Calculator Comparisons, Feb 1975, New Scientist Magazine
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Guilford Calculator Centre Ad, Feb 1975, New Scientist Magazine
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Mountaindene Ltd. Ad, Feb 1975, New Scientist Magazine
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Cavendish Sales Ad, Nov 1975, New Scientist Magazine
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Cavendish London, Sales Ad, New Scientist 27Feb1975 Pg509
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Rockwell Ad, Mar 1975
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Landau Radio Ltd. Ad, Nov 1975, New Scientist Magazine
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Electronic Calculator Buying Guide, Popular Science Magazine Pg80-81, Feb 1975
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Executive Calculators Ad, Nov 1975, New Scientist Magazine
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Casio Ad.1975, Germany
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Casio Ad.1975, UK
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Farad 1233 Electronic Slide Rule, Electronics Today International Oct1975 pg60
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Farad 808 Electronic Slide Rule, Electronics Today International Oct1975 pg62
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Farad 807 Electronic Slide Rule, Electronics Today International Oct1975 pg65
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Farad Auatralia Electronic Slide Rule Ad, Electronics Today International Oct1975 pg45
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Elcon Calculators (Same As Kings Point) Ad, Electronics Today International Oct1975 pg48
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Compuad ESR Electronic Slide Rule Ad, Electronics Today International Oct1975
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Qualitron Photimport Australia Calculators Ad. Electronics Today International Oct1975 pg31
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Scientific CalculatorsElectronics Today International Oct 1975 (PDF)
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Scientific Calculators Table - Electronics Today International Oct 1975
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Novus Calculator Ad Electronics Today Int Oct 1975 pg38
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Canon International Palmtronic Calculators Ad, Electronics Today Int, Oct 1975 pg42
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JCPenney Rockwell CalculatorAd Nov 10, 1975. Brainerd Daily Dispatch
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Radio Shack 1975 Catalog Page 162. Shows EC-450
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Radio Shack 1975 Catalog Page 163. Shows EC-400 and EC-425
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Faber-Castell 1975 Ad
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Heathkit IC-2100 Electronic Slide Rule - Elementary Electronics, Jan-Feb 1975 (released in 1974 for 1975 Catalog)
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Rockwell Slide Rule Calculator Ad. Models 61R, 63R. The Michigan Daily, May 1975
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Lafayette Electronics Calculator Ad. TI SR-11, SR-16, SR--50A, SR-51.The Michigan Daily, September 1975
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Lafayette Electronics Slide RuleC alculator Ad. Qualitron, TI-SR-16, Litronic, Melcor SC-535. The Michigan Daily, April 1975
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Big Georges Slide Rule Calculator AD. Rockwell 21R, 63R, TI SR-16, SR-50, SR-51. The Michigan Daily, May 1975
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Novus Calculator Ad.Novus 850, Mathematician. The Michigan Daily, February 1975
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Lafayette Electronics Calculator Ad. TI SR-16. $88.00. The Michigan Daily, January 1975
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Lafayette Electronics Calculator Ad. TI SR-16 Price Reduction $59.88. TI-1200, TI-2500II. TI-2550. The Michigan Daily, September 1975
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Meijer Thrifty Acres. Unitrex Deluxe Slide Rule Calculator. The Michigan Daily, October 1975
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Hewlett Packard HP-21, HP-25 Scientific. The Michigan Daily, September 1975
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Lafayette Electronics Calculator Ad TI SR-10. The Michigan Daily, January 1975
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Lafayette Electronics Calculator Ad. SR-50,SR-10, TI-2510. The Michigan Daily, October 1975
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Discount Calculator Sales, Dallas, TX Ad. TI SR-51 Super Slide Rule Calculator, SR-50, SR-16, SR-11, TI-5050. The Michigan Daily, June 1975
Original Page
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Lafayette Electronics Ad. Kingspoint SC-20 Calculator. The Michigan Daily, October 1975
Original Page
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Lafayette Electronics Calculator Ad TI SR-11 PriceReduction $49.88. The Michigan Daily, June 1975
Original Page
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Lafayette Electronics Ad. Kingspoint SC-20 Calculator. The Michigan Daily, October 1975
Original Page
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Follett's Michigan Bookstore TI SR-16. The Michigan Daily, October 1975
Original Page
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Melcor Scientist SC-535 Slide Rule Calculator. The Michigan Daily, February 11, 1975
Original Page
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Melcor Scientist SC-535 Slide Rule Calculator ($10 Increase In One Week). The Michigan Daily, February 05, 1975
Original Page
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Heathkit Calculators - Christmas 1975 Catalog #806
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Ryman Calculator Ad - New Scientist 13Nov1975
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IMAGE
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DESCRIPTION
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LITERATURE
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EXHIBIT PLACARD
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ISRM 18.10.24.15
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APF Mark-31 Slide Rule Calculator snW-003247
1975 -
This Electronic Slide rule by APF (company name is based on the initials of the founders: Al and Phil Friedman). This 27 key slide rule calculator with memory uses a VFD display and powered by a 9V battery.
The company was founded to import stereos from Japan to the U.S., specifically quadraphonic sets and 8-track player. They moved into calculators.in the mid 70's. APF had locations in Queens, NY where they were headquartered, and in Hong Kong, where they owned a factory. In all, APF employed 300 people. After calculators they imported video games, but went bankrupt in 1983.
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Manual TBD
Wanted for Exhibit
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ISRM 18.10.24.04
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APF Mark-50 Scientific (Slide Rule) Calculator snJ-086103
1975 -
This Electronic Slide rule by APF (company name is based on the initials of the founders: Al and Phil Friedman). This 19 key slide rule calculator has a function key that provides an additional 17 functions, including with memory. It uses a VFD display and powered by a 9V battery.
The company was founded to import stereos from Japan to the U.S., specifically quadraphonic sets and 8-track player. They moved into calculators.in the mid 70's. APF had locations in Queens, NY where they were headquartered, and in Hong Kong, where they owned a factory. In all, APF employed 300 people. After calculators they imported video games, but went bankrupt in 1983.
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Manual TBD
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ISRM 13.01.27.25
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Casio Memory-8A Electronic Calculator
July 1975 - $??
1975 was a big year for Casio and in July, the Memory-8A personal eight digit calculator was introduced, with memory and square root, plus percentage key. A minimum slide rule. 19 keys in total. This machine used a Micro PD977C Chip and a LD8120 blue Vacuum fluorecant Display.
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Manual TBD
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ISRM 18.10.24.13
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Casio FX-10 Scientific (Slide Rule) Calculator sn2120532
1975 - £56
This Electronic Slide rule by Casio in Japan is one of their first Scientific calculators. Casio never tagged their calculators that were in the immediate post slide rule era a "slide rule Calculators" even though their USA and UK competitors, TI, HP, Rockwell, and a myriad of others did. At least I (the ISRM curator) could not find any references to slide rules in their literature. This calculator is powered by replaceable 4 AA batteries, their model AD-4145 AC power Adaptor, and uses a green VFD display. There are 29 single use keys that provide root, sqr root, inv, and trig functions, and a PI key. In acquiring, Casios, the odds of them working after 40+ years is far better than their counterparts that had non-replaceable NiCads imbedded in the units, which corroded over time and lack of use. In many cases damaging the internal circuitry.
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Manual TBD
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ISRM 13.03.30.01
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Litronix Solid State 1602 Slide Rule sn46836
1975 - ~$??
This is four-function calculator with
expanded memory functions by the Litronix
company and has 'SLIDE RULE' printed on the
keyboard, however there are no slide rule functions. With a brown
case, raised buttons keys and a large LED digits.
display with digits. It takes advantage of using newer Integrated Circuits
with all the processing done on one chip. A mystery calculator as identical
models replace 'slide rule' with 'memory' on the faceplate. The model 1603
actually has a squared and SqR key instead of M+ and M-, so this could be a mixup in labeling at the factory.
See the image of the 1603 below and the 1602 'Memory' to the right. All the keys on the later are white.
Litronix, Inc., (Cupertino, CA) was an early
light-emitting diode (LED) company that
became a leading supplier of displays for
handheld calculators and digital watches
(e.g. the Hamilton Pulsar line).
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Manual TBD
Litronix 1602 Memory
Guy Ball Photo
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ISRM 13.05.15.01
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Litronix Solid State 1603 Slide Rule sn216455
1975 - ~$??
This is your basic slide rule calculator with
square, square root, percent and memory functions by the Litronix
company. It has 'SLIDE RULE' printed on the
keyboard, just like the Litronix 1602 which has no slide rule functions. With a brown
case, raised buttons keys and a large LED digits.
display with digits. It takes advantage of using newer Integrated Circuits
with all the processing done on one chip.
Litronix, Inc., (Cupertino, CA) was an early
light-emitting diode (LED) company that
became a leading supplier of displays for
handheld calculators and digital watches
(e.g. the Hamilton Pulsar line).
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Manual TBD
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ISRM 13.01.27.12
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Enterprex SR-55 Junior Electronic Sliderule Calculator
1975 - $??.??
This is an obvious example of a calculator
trying to represent itself as a slide rule!. It has 30 keys, with 1/X, X2 and SQRT
slide rule functions. 2 AA batteries power a green Vacuum Florescent Display.
Enterprex imported calculators from several Asian companies, most of which
were from Tiawan and Hong Kong. They operated for about 7 years from 1975
through 1983, but fell victim to the lower prices of Japanese companies,
along with a lawsuit from TI and HP, which did not allow them to produce
scientific calculators, limiting their potential market. They then concentrated
on making novelty (credit card sized)
calculators for promotional purposes.
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Manual TBD
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ISRM 18.10.24.01
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Enterprex SR-65 Electronic Sliderule Calculator
1975 - $??.??
This is an obvious example of a calculator
that has all the slide rule functions! It has 36 keys, with 1/X, X2,SQRT Sin, Cos, INV, XY, EX, 10X, with memory storage. All the
slide rule functions. 3 AA batteries power a green Vacuum Florescent Display.
Enterprex imported calculators from several Asian companies, most of which
were from Tiawan and Hong Kong. They operated for about 7 years from 1975
through 1983, but fell victim to the lower prices of Japanese companies,
along with a lawsuit from TI and HP, which did not allow them to produce
scientific calculators, limiting their potential market. They then concentrated
on making novelty (credit card sized)
calculators for promotional purposes.
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Manual (865Kb)
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ISRM 18.10.24.08
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Kings Point KP-460 Electronic Slide Rule sn07466
1975 - ~$26
Although the calculator does not have "slide Rule" on its labels, the manual does in its title and in the text as:
"Your 8 function slide-rule calculator". It can compute complex problems utiling memory, sum of products, product of sums, reciprocals, squares and Nth root.The blueish VFD (vacuum flourescant) display is powered by 3 AA batteries, but can also be powered by their Model 616 AC adaptor.
Kings Point is also sold under the brand names Realtone, MBO, ELCON, EMAIL, and EMONA.(see ELCON/EMONA advertisment for model number.
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Manual (171Mb)
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ISRM 12.09.15.01
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Melcor SC-645 Electronic Slide Rule Calculator sn844861
1975 - >$49.95 kit ($69.95 Assembled)
Another great example of a calculator as a 'slide rule'
alternative with the picture of a Pickett 140-T on the cover of the manual.
The SC-645 is basically the same as the SC-635, except for the color of the keys
and the use of a slide switch instead of a rocker. The SC-645 fixed the ROM bug
that caused the SC-635 to be sold at discount prices.
Melcor Electronics Corporation of Farmingdale, New York (USA) was one of the
first US companies to enter the pocket calculator business.
Components can be swapped between the two units. The unique (and now obsolete) battery was swapped
out with a removable setup of an R/C toy cable set and three 3/4size AA NiCds. (See pictures).
These can be charge with a 9VDC charger using a subminiature phone jack (Like the TI AC9180 charger).
More info on Melcor
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Manual (3.07Mb)
(SC-635 with SC-645 label)
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ISRM 18.10.24.07
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National Semiconductor Mathematician (Electronic Slide Rule Calculator) sn844861
1975 - $69.95
Inegrated circuit manufacturer produced this Scientific Slide calculator having 24 keys with a function key expanding it to 31 operations. It uses red LEDs, and is powered by one 9V battery.This one was made in Malaysia with a date code of P347. They were also sold as the Novus brand as model 4510 Mathematician.
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Manual TBD
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ISRM 13.02.03.03
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Dixon's Prinztronic SR88M sn518318
$-17-1975 - £16.95
This calculator has the minimal slide rule
function of a square root key and uses a
single green Vacuum Flourescent Display
(VFD). It is operated by four AA batteries.
It was made in Japan, possibly by TEAL
(Tokyo Applications Laboratory), specifically
for Dixon's, a UK electrical retailer, like
Radio Shack, that rebranded many forms of
calculators. It uses a Texas Instruments CPU.
This specimen has a receipt for when it was purchased from Dixons in the town of Bath, England.
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Manual (2.88Mb)
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Dixons Receipt
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Rockwell 63R Electronic Slide Rule sn259209
1975 - $99.99
There is no doubt that this was 'slide rule' calculator with the label on the front.
This classic Rockwell design is a little larger than most. Odd pivoting keys in the normal Rockwell colors.
It has an 8+2 digit blue VFD display with a ninth digit (and intervening one) for the minus signs.
Display input starts at the left rather than the normal right. This particular specimen was used by a
Hughes Aircraft employee and it had an asset tag, meaning the company owned it. It was assembled in Mexico.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual
Rockwell 63R Box End
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Texas Instruments TI-2550-II Memory Calculator sn048274
October 17, 1975 - $49.95
This is the cost reduced successor of the
1974 ($99.95) TI-2550 basic calculator. It
added minimal slide rule functions and the
housing is identical to the SR-16 II, with a
different keyplate. The TI-2550 II uses two
sliding switches and a green VFD (Vaccum
Fluorescent Display), a rare combination in
TI's calculator history.This calculator was
quickly replaced by the TI-2550 III, within 6
months, as keyboard without a [+/-] key was
not too useful.
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Manual (2.77Mb)
BP-2
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ISRM 12.08.15.18
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Hewlett-Packard HP-55 Programmable Slide Rule with timer sn1505A-05932
1975 - $395.00
Coming out a year after the HP-65, the HP-55 didn't generate quite the same level of excitement.
It had no card reader and only 49 lines of program memory. (And, of course, a much lower price.)
However, it did have more than twice as many storage registers (R0-R9 and R.0-R.9), more
pre-programmed functions and a quartz controlled timer. The timer was first officially
introduced on the HP-55 and turned the hand-held calculator into a useful test equipment like multi-meters.
Timer mode was engaged by a switch (Timer/Prgm/Run). Once engaged,
the timer could be started or stopped by pressing R/S, cleared by pressing CLx, and the
current time could be stored in any of the 10 registers by pressing 0-9.
Donated to ISRM by the Huang Collection.
Note:one of the lower segments is missing in the display at 3.14[1]59256 (5th digit from the left.
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Handbook to be scanned soon
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Faber-Castell TR3
Slide Rule w/Calculator
Circa 1975 - dm218
Faber-Castell TR3 (Der erste elektronische Taschen-Rechenstab) made by one of the premier slide rule manufacturers in Germany, attached has a pocket slide rule to the back of a similarly shaped scientific calculator with slide rule functions (making the slide rule portion redundant).
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Manual TBD
1975 Ad
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WANTED
for Exhibit
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Aristo M42 Electronic Slide Rule sn2LL13-0716
1975 - $unknown
Dennert & Pape (Aristo) was one of the world's premier suppliers of slide rules in Germany.
They stopped slide rule production and created their own line of electronic slide rules.
The M42 is a wider version than the previous generation of the basic slide rule with memory (see M65 in 1974)
as it had to accomodate a single VFD tube from Japan
(as opposed to the smaller red LEDs from Hewlett-Packard. It uses only 2 AA replaceable
batteries to drive the display, as the VFDs required less voltage, as compared to the red LEDs.
It has a 5x5 keyboard matrix with no function key.
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Manual TBD
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Aristo M66S Electronic Slide Rule snNone
1975 - $unknown
Dennert & Pape (Aristo) was one of the world's premier suppliers of slide rules in Germany.
They stopped slide rule production and created their own line of electronic slide rules.
The M66S is a wider version than the previous generation of the basic slide rule with memory (see M65 in 1974)
as it had to accomodate a single VFD tube from Japan
(as opposed to the smaller red LEDs from Hewlett-Packard. The 'S' denotes non-replaceable
sealed nicads (2 AA size). It has a 5x5 keyboard matrix with 5 memory keys via the function key.
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Manual TBD
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Aristo M76 Electronic Slide Rule snF2LT04-0359
1975 - $unknown
Dennert & Pape (Aristo) was one of the world's premier suppliers of slide rules in Germany.
They stopped slide rule production and created their own line of electronic slide rules.
The M76 is a wider version than the previous generation of the scientific slide rule (see M75 in 1974)
as it had to accomodate a single VFD tube from Japan
(as opposed to the smaller red LEDs from Hewlett-Packard. It uses 2 AA replaceable
batteries to drive the display, as the VFDs required less voltage, as compared to the red LEDs.
It has a 5x4 keyboard matrix shiftable to another set of 5x4 keys via the function key. You might say this
analogous to 'duplex' slide rule, which had double the functions of a one-side slide rule. This model has 3 slide switches,
power, rad-deg, and alpha.
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Manual TBD
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ISRM 12.04.10.09
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Texas Instruments SR-51 Super Slide Rule Calculator sn0065182
January 1975 - $224.95
The SR-51 Super Slide Rule Calculator now has a shift key, like the HP-45, which effectively doubles the number of keys. Statistical
functions are now available. The war continues with HP as this is competing head-on
with the HP-45. In 1976 the price of the SR-51-II is reduced to $79.95.
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Manual TBD
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Hewlett-Packard HP-35 Electronic Slide Rule V4 sn1364A-32400
February 1975 - $195.00
This is the last HP-35 model produced. Note that the function labels are on the keys rather than on the bezel.
More at MoHPC
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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ISRM 12.08.15.33
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Hewlett-Packard HP-21 Electronic Slide Rule sn1506A60518
1975 - $125.00
The first of the 20 series, the HP-21 was essentially an HP-35 Electronic Slide Rule in a smaller,
less expensive package. It used 2 AA cells rather than 3. Since the HP-21 had 33% more ROM than the
HP-35 it had room for a few extra features, namely:
Trig functions in radian mode. (The mode was selected by a slide switch.)
Display formatting. (DSP # displayed # decimal places in scientific mode.
DSP . # displayed # decimal places in fixed mode.)
Polar/rectangular conversions.
Storage arithmetic. This was implemented using special keys for M+, M-, Mx and M/.
10^x.
The HP-21 also implemented other changes that appeared in post HP-35
calculators. For example, it provided y^x rather than x^y and the CLR
key left the storage register intact.
Donated to ISRM by the Huang Collection..
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Handbook to be scanned soon
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ISRM 12.08.15.30
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Hewlett-Packard HP-25 Scientific Calculator sn1603A67725
1975 - $195.00
The HP-25 started on the drawing board as a scientific (slide rule) calculator with a much larger
set of functions than the HP-21. By the time it was done, it was that and it was
programmable with 49 lines of memory, making it the least expensive and smallest
of HP's programmable calculators. Like the HP-65, the HP-25 caused disbelief in many.
It seemed much too small to do so much. Unlike previous programmables, the HP-25
had fully merged key steps... (All multi-keystroke entries like f COS and STO * 2
took a single step.) Engineering display mode was also a first on this calculator.
The SST key was improved such that when it is held down, it displayed the line and
line number about to be executed. When released, it executed the line and displayed the result.
Like the HP-55, the HP-25 used line number addressing rather than labels. This made
it very easy to move around while editing a program but inserting an instruction
required either clever coding or reentering all instructions from that point onward.
Donated to ISRM by the Huang Collection..
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Handbook to be scanned soon
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Hewlett-Packard HP-27 Scientific/Business/Stat Calculator sn1611A009997
1976 (to 1978) - $200.00
The HP-27 is the "Do Everything" Model (Sci/Stat/Math/Bus) but no programming capability.
The HP-27 came with a 230 page Owner's Handbook. From the Introduction:
"At last, someone has made "a calculator for all seasons." The HP-27 solves the problems that you, the multi-dimensional professional, encounter everyday. Whether you are juggling budgets, answering a technical question, forecasting trends, checking lab results, or analyzing market data, the HP-27 solves problems fast and accurately to make your job easier."
. . "At work, at home, or on the road... whether you are tackling the company's problems or your own, the HP-27 puts answers at your fingertips. Over a million HP business and scientific pocket calculators are in use throughout the world, so you're in good company with HP!"
Note: This calculator in INOP.A donation of a working replacement would be appreciated.
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Handbook to be scanned soon
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Faber-Castell TR4
Circa 1975 - DM268
Faber-Castell TR4 (Der erste Elektronische-Rechenstab) now includeds logaritmic functions and exponent capabilities, finally making the need for the slide rule (like the TR-1, TR-2, and TR-3) obsolete.
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Manual TBD
1975 Ad
|
WANTED
for Exhibit
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Unisonic 888 Slide Rulette sn027208
Circa 1975 - $unknown
A 4-function calculator that is included simply because of its model name. Unisonic Products Corporation was an American manufacturer established in 1972 as a distributor of consumer electronics. Although headquartered in New York City, Unisonic outsourced its manufacturing operations to various facilities in East Asia (especially in Hong Kong, South Korea, and Japan). Unisonic developed a variety of electronics, including calculators. Several of their first calculators had the trademark 'SLIDE RULETTE' even though they were missing the minimum requirement of a square root key. As the calculator industry became more competitive, they moved into game consoles and digital watches.
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Manual TBD
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Radofin Professional Slide Rule sn875-10125
Circa 1975.
This Radofin is a perfect example of a Slide Rule calculator. No risk of misinterpreting 'SR' as it is clearly spelled out. The model 875 is an arithmetic calculator with 8 digits precision and algebraic logic. It has a total of 23 keys with 9 functions, including 1/X, X2 and SQRT, The red LED display is powered by 4x AAA batteries mounted in a removable cartridge.
This working example is missing the cover required to retain the cartridge and a contact terminal is missing.
In the 70's Radofin Electronics Ltd. was run by directors Laurie Scott, his son Laurie Jr and brother Ken in London. They produced novelty radios before moving onto calculators in 1974. By 1976 they moved out of calculators and concentrated on TV electronic games. Most of Radofin's products were imported from Hong Kong and were sold in Europe, especially France, Germany and Italy.
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Manual TBD
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mycalcdb.free.fr Photo
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Silver-Reed SR81 Slide Rule Calc
1975.
Silver Reed Ltd. began operations as
Marukoshi Knitting Machines Ltd. in Tokyo
in the 1950s and in 1967 the company name
was changed to Silver Seiko Ltd. It claims to
be the first company to sell electronic home
knitting machines as early as 1977, and, as
as their technology, began selling rebranded
calculators and electric typewriters.
This model has the basics of a minimum level Slide Rule calculator with 'SR' in the model number. The model SR81 is an arithmetic calculator with 8 digits precision and algebraic logic. It has a total of 23 keys with 6 functions, including %, and SQRT, plus 3 memory keys. The green VFD display is powered by 2x AA batteries. The 1976 SR82S actually has "Slide Rule" printed on its fascia"
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Manual TBD
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mycalcdb.free.fr Photo
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Silver-Reed SR82 Slide Rule Calc
1975.
Silver Reed Ltd. began operations as
Marukoshi Knitting Machines Ltd. in Tokyo
in the 1950s and in 1967 the company name
was changed to Silver Seiko Ltd. It claims to
be the first company to sell electronic home
knitting machines as early as 1977, and, as
as their technology, began selling rebranded
calculators and electric typewriters.
This model has the basics of a minimum level Slide Rule calculator with 'SR' in the model number. The model SR82 is an arithmetic calculator with 8 digits precision and algebraic logic. It has a total of 24 keys with 10 functions, including 1/X, X2, %, and SQRT, plus memory The green VFD display is powered by 2x AA batteries. The 1976 SR82S actually has "Slide Rule" printed on its fascia"
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Manual TBD
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ISRM 12.04.10.05
|
Texas Instruments SR-50A Slide Rule sn829858
March 1975 - $109.50
The SR-50A Slide Rule Calculator had reduced manufacturing costs. The only other
advantage compared to early SR-50 calculators is the higher calculating precision.
Donated to ISRM by Jeff Illsman, Longmont, Colorado
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Manual (7.41Mb)
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Texas Instruments TI-1200 4 Function Calculator with percent sn347374
March 1975 - $24.95
This became the low cost base line model that had dozens of variants
with different colors and OEM distributors. It demonstrated the later design
and technical engineering of the TI-30. Only the keyboard faceplates changed
between models as hidden underneath were extra key switches, like a change sign
and fully operational memory with 4 keys, that would get
used by other calculators models, all using the same basic calculator
integrated circuit (IC). The European model was the TI-1250.
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Manual EU (3.5Mb)
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Texas Instruments SR-51A Super Slide Rule Calculator sn089331
June 1975 - $224.95
The SR-51A was introduced shortly after
the SR-51 to reduce manufacturing costs.
The keyboard layout kept the same key
functions, but moved them down and the
colors changed from silverto gold trim.
The original SR-51 became much sought after
by collectors as it had a short production
run.
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SR-51 Manual(1.87Mb)
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Texas Instruments SR-16-II Electronic Slide Rule Calculator sn195350
August 1975 - $49.95
The SR-16-II Slide Rule Calculator had a cheap appearance with the
few black keys and the printed keyplate. Printed/colored keys cost more as each
has to have their own inventory control. Uses 3 AA Alkaline Batteries. AC adaptor: AC9180 .
The original SR-16 is more valuable and classier looking. The SR-16-II PWA is
identical to the Zayre Concept III Advanced Slide Rule..
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SR-16 Manual (4.21Mb)
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Texas Instruments SR-52 Programmable Slide Rule Calculator sn042250
September 1975 - $395.95
the SR-52 tntroduced an integrated a card reader for magnetic strips,
a huge memory (for the day) for 224 steps and the revolutionary AOS entry into a
housing similar to the SR-50A calculator. The SR-52 was the thickest calculator ever at 1.8".
The SR-52 was clearly placed against the Hewlett-Packard HP-65, later the HP-67 got identical memory space to the SR-52.
Although the retail box has 'Slide Rule Calculator' printed on the outside, the
sales literature does not reference Slide Rule any more.but stresses 'Programmable'.
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Manual (25.7Mb)
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Qualitron 1444 Slide Rule Version 1
June 1975 - $24.95
This is the first Qualitron 1444 labeled "Slide Rule" and is just a basic 5 function calculator with % and +/- keys including 3 memory keys. In total, 21 keys with an 8 digit green VFD with a ninth on the far left for negative, memory and error indication. It does not actually qualify for the 'loose' definition of being a slide rule as there is no square root key.
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Manual TBD
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WANTED
for Exhibit
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Qualitron 1444 Slide Rule Version 2
June 1975 - $24.95
Qualitron 1444 Slide Rule has 26 keys with an 8 digit green VFD with a ninth on the far left for negative, memory and error indication. Standard four functions with percentages, powers, square root, squares, reciprocal, register exchange and four function memory.
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Manual TBD
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WANTED
for Exhibit
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Qualitron 1444 Slide Rule Version 3
June 1975 - $24.95
Qualitron 1444 Slide Rule has 30 keys with an 8 digit green VFD with a ninth on the far left for negative, memory and error indication. Standard four functions with percentages, powers, square root, squares, reciprocal, register exchange and four function memory.
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Manual TBD
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WANTED
for Exhibit
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Korvettes XAM Model 889 Slide Rule Calculator sn5061756
1975 - $29.99
This basic slide rule calculator was sold by
E. J. Korvette's, which was an American chain of discount department stores, founded in 1948 in New York City. It is notable
as one of the first department stores to challenge the suggested retail price provisions of anti-discounting statutes.
Founded by World War II veteran Eugene Ferkauf and his friend, Joe Zwillenberg, E.J. Korvette did much to define the
idea of a discount department store. It displaced earlier five and dime retailers and preceded later discount stores,
like Wal-Mart, and warehouse clubs such as Costco. The company failed to properly manage its business success which
led to decline and its 1980 bankruptcy and closure. (citation)
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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Commodore 725SR
1975 - $ ?
CMB Commodore issued over 120 calculators during the 1970s. They bought the semiconductor manufacture MOS and
then went on to sell the Pet Computer, Commodore 64, 128 and Amiga computers through the 1980s.
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Manual TBD
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WANTED
for Exhibit
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Commodore SR4148R sn121055
1975-1977 - ~$120
The SR4148, a scientific slide rule calculator
that has 78 keys, all with a single function
(no shift key). was produced from 1974 chips and sold
through 1977. It uses a red LED cluster and
is powered by 3 AA rechargable NiCad
batteries (3.6VDC), noted by the 'R' suffix in the model name.
It uses AC adaptors (UK calls the 'Mains') DC640B, 707C, 708C or 709C.
By 1976, the term 'slide rule' was
not used in Commodore's advertising as it
was in 1975, as they were now thinking
ahead toward programmable computers. Even the manual that came with this specimen states:
"Thank you for selecting our new scientific calculator. We prefer to call it a mini-computer because of its ability to handle so extensive a range of complex assignments across a broad spectrum of basic and advanced mathematics."
The ad on the right was from an October 1976
New Scientist magazine.
Note: This calculator looks exactly the same as the 1978 SR-4120D which uses a 9V disposable battery.
Disposables became more popular as Large Scale Integrated circuits advanced in technology with more of the calculator on one chip which reduced the power consumption of the calculator. This made them that much more portable and relieved the user from being near a charging source. This SR4148R needed to be taken apart and its NiCads replaced because they corroded over the last 40 years.
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Manual TBD
CBM ad, Oct 1976 New Scientist
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Commodore SR-9120D sn03697 (V1)
1975-1976 - ~$120
Commodore's SR-9120D advanced scientific slide rule using much of the same parts as the SR-1800,
but uses a red LED display. It has a shift key for increasing the number of functions available to the user.
The '12' in this silver model number denotes the number of digits displayed. The 'D' means it had disposable batteries, in this case one 9V battery.
CBM or Commodore Business Machines, issued over 120 calculators during the 1970s. They bought the semiconductor manufacturer MOS to produce
their own calculator chips but by 1981 they abandoned calculators in favor of personal computors like the PET Computer,
Commodore 64, 128 and Amiga computers which continued through the 1980s. They were noted for putting lots of colorful
buttons on their later scientific and slide rule calculators (SR prefix or suffix in the model number) while HP and TI moved toward
shift keys giving individual keys multiple functions. This specimen was acquired out of Australia and was built by Commodore Japan.
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Manual TBD
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Commodore GL-989R Portable Electronic 'Slide Rule' Calculator
1975 - £14.00
The Commodore GL-989R Portable Electronic Calculator is an arithmetic
calculator with slide rule functions (sqr root,
1/X, X squared) with memory. It has 8 digits
precision and algebraic logic with a total of
8 functions, 19 keys and a VFD (vacuum
fluorescent) display. The power source is
Sealed battery pack with 3 nicads. It was
manufactured in Japan and was part of
Commodore's 'Custom Green Line' because of the green VFDs.
An advertisement in the New Scientist magazine describes
this calculator as "CBM 989R Slide Rule - Scientific Green Display".
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Nov 1975 New Scientist
Executive Calculators Ad
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ISRM13.01.27.02
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Commodore SR7919 Electronic 'Slide Rule' Calculator
1975 - £12.95-15.20
The compact SR7919 was made in USA and
England and is a full electronic 'Slide Rule'
with the 'SR' prefix. It performs arithmetic
operations with 18 keys and a shift key that
adds another 18 scientific and memory
functions. The display is an 8 digit red LED
with bubble lens with a ninth digit for
negative, function select and error indicators
display. The power source is a 9V disposable
battery. It came in biege or black packaging.
Each button has a two color label showing
operators or 2nd functions. This was a cost
savings measure to utilize the molds for
several models. Most calculators after this
evolved with functions labels on faceplates.
This calculator was advertised by several
retailers in the November 1975 supplement
of The New Scientist Magazine.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Nov 1975 New Scientist
Executive Calculators Ad
Nov 1975 New Scientist
Cavendish Sales Ad
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ISRM 13.01.27.04
|
Compex SR-10 Slide Rule Calculator
1975 - $ ?
Compex was a brand manufactured in
Tiawan and Hong Kong and imported by
Cal-Comp Electronics, Inc in the USA.
The Hong Kong manufacturer was Nam Tai
Electronic Company in Kowloon.
Compex provided 4 models of slide rule
(SR prefix) calculators, the SR-8, SR-10,
and later the SR-40 and SR-55.
The SR-10 had the bare minimal slide rule
function of a SQRT key. The SR-40 added
1/X and X^2. The SR-55 included trig
functions and exponential operations.
Like most of the calculators coming out of
China, in 1975, the the SR-8 and SR-10
had the Commodore-ish appearance of red,
white and blue keys to appeal to the
American market.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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TI The Spirit Of 76
1975 - $14.88
This wonderful calculator was designed to commemorate the 200th birthday of the United States of America.
Included here as it was a forerunner of calculators becoming a commodity as a promotional item.
The European market received the TI-1260. Under the patriotic housing you'll find a basic TI-1200 calculator,
nevertheless most collectors will pay much more for the Spirit of '76.
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Manual (3.3Mb)
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ISRM 13.01.27.19
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TEAL 826 Memory sn408792
c1975 - $???
This minimul Slide Rule calculator, witha square root and percent key, was made by TEAL, 23 keys and a
green VFD display powered by 2 AA batteries. TEAL stanads for Tokyo Electronic Application Laboratory Ltd.
TEAL entered the calculator business in late 1968 and sold OEM products to Toshiba, Hitachi and Canon.
The company was greatly affected by the calculator price war of the mid 1970s and went out of business in 1978.
After that only 2 companies, Sharp and Casio, remained as an electronic calculator company in Japan.
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Manual TBD
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ISRM 13.02.05.02
|
TEAL SR82 Scientific Memory sn510891
c1975 - $???
This scientific Slide Rule calculator was made by TEAL 20 keys, one of which is a function key that adds 22 more functions.
TEAL stanads for Tokyo Electronic Application Laboratory Ltd. .
TEAL entered the calculator business in late 1968 and sold OEM products to Toshiba, Hitachi and Canon.
The company was greatly affected by the calculator price war of the mid 1970s and went out of business in 1978.
After that only 2 companies, Sharp and Casio, remained as an electronic calculator company in Japan.
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Manual TBD
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Calfax 899S sn213754
c1975 - $???
This scientific Slide Rule calculator was made in Hong Kong and distributed by Calfax Inc. (New York, USA). It uses red LEDs
with a 9V battery. This specimen is innoperative. Calfax had over a 10 models and only seemed to produce calculators between 1975-1976. Another loser in the calculator wars between TI, HP, Casio and Sharp.
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Manual TBD
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Casio Memory-8A CD-813
1975-1976 - $24.95
This minimum Slide Rule calculator with SQRT key and Memory was made in Japan. It uses green VFD
with two AA batteries. This specimen is functional.
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Manual TBD
Time Magazine, January, 1976
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Panasonic 8220U sn99409435
c1975 - $???
This is a minimal Slide Rule calculator with 8 functions (+,-,x,/,sqrt, pi,%,+/-) with memory, 24 keys and a VFD (vacuum fluorescent) display. The power source is 2xAA batteries. Panasonic is a division of Matsushita Electric Corporation. This is a nice compact version, and they produced over 250 calculator models from 1970 through 1986. Yet, they did not gain as mich of a foothold in the slide rule/scientific community, as the other other Japanese rivals, Casio and Sharp, and the dominant US makers, TI and HP.
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Manual TBD
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ISRM 12.09.26.02
|
Montgomery Ward P202 Memory+Electronic Calculator, sn57X-11899
1975 - ~$50.00
The P202, model number DAN-8656A,
upstaged the P200 (A rebranded TI-2550)
and included more slide rule functions,
which was a capability referenced on the
2nd page of the manual. The manual also
has a note from its owner that it was
purchased March 25, 1975. It has 20 keys
with 8 additional functions. Although
assembled in the U.S.A. it used Japanese
components like the blue VFD driven by a
9V battery.
APF, Lloyd's or Novus, along with TI, were
OEM manufacturers of Montgomery Ward
calculators. Montgomery Ward
closed its business in December 2000.
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Manual (1.98Mb)
Page 2 mentions "slide rule"
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ISRM 12.09.26.04
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Unisonic 1548 Slide Rule Calculator sn065283
1975 - $??.??
The Unisonic 1548, claiming to be a
"Technological Miracal!!" on its box cover,
is an arithmetic calculator with slide rule functions. 8 digits precision
is displayed using red LEDs and uses algebraic
logic. It has 13 functions, 30 keys. The
power source is 2 AA batteries. This unit
was manufactured in Hong Kong.
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Manual (714Kb)
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ISRM 12.09.26.03
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Unitrex Mini Handy 80SR snA57K83011
1975 - $??.??
Unitrex was a brand of calculators
distributed by Unitrex of America in New
York, which later moved to California in
the mid 1970's. Calculators were made by
Eiko Business Machine Co., Ltd in Japan
which also OEM'd slide rule calculators to
Montgomery Ward (US), Bohn, and Quelle
(Germany) . The MINI HANDY 80SR
is a scientific 'slide rule' calculator with 8
digits precision and algebraic logic. It has 20
functions, 26 keys and an LED display. The
LEDs are very small to see, even with little
magnifying lens above each 7-segment display.
The power source is 3xAA batteries.
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Manual (1.6Mb)
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Archive - Need for Exhibit
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Unitrex Executron S874L Slide Rule Calculator sn5699309
1975 - $??.??
Unitrex was a brand of calculators
distributed by Unitrex of America in New
York, and Unitrex of Canada which later moved to California in
the mid 1970's. Calculators were made by
Eiko Business Machine Co., Ltd in Japan
which also OEM'd slide rule calculators to
Montgomery Ward (US), Bohn, and Quelle
(Germany) . The Executron S874L
is an advanced scientific 'slide rule' calculator with 8
digits precision and algebraic logic. It has 27
functions, 40 keys and an LED display.
The power source is 3xAA batteries.
Model S874LR had 3 rechargable batteries.
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TBD
Back Label
case
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ISRM 18.09.15.01
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Unitrex Executron S874LR Slide Rule Calculator sn5730380
1975 - $??.??
Unitrex was a brand of calculators
distributed by Unitrex of America in New
York, and Unitrex of Canada which later moved to California in
the mid 1970's. Unitrex was made by
Eiko Business Machine Co., Ltd in Japan
which also OEM'd slide rule calculators to
Montgomery Ward (US), Bohn, and Quelle
(Germany). This unit is shown as having been made in Korea
and distributed by Unitrex of Canada, Downsview, Ontario.
The Executron S874L
is an advanced scientific 'slide rule' calculator with 8
digits precision and algebraic logic. It has 27
functions, 40 keys and an LED display.
The power source is 3xAA rechargeable batteries which were in removable battery pack.
This unit was hardwired for 3 batteries. New batteries have not brought this to life
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TBD
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Archive - Need for Exhibit
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Spectrum SP-70 Scientific w/ Algebraic Logic
1974 - £55.00
A little known slide rule calculator distributed by Kramer & Co. in London. VintageCalculators.com
suggests it was a USA company. Spectrum touted Algebraic Logic, as an alternative to RPN.
39 keys 22 functions. Rechargable battery. No physical specimen seems to exists in known collections. 2 reference ads found.
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Manual TBD
New Scientist 5Dec1974 Pg730
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New Scientist 27Feb1975 Pg509
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Commodore CBM Scientifics Oct 1976, New Scientist Magazine
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Rockwell Ad May 1976, New Scientist Magazine
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Rockwell Ad Dec 1976, New Scientist Magazine
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Cavendish Sales London Ad Dec 1976, New Scientist Magazine
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Casio Scientifics Dec 1976, New Scientist Magazine
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Ryman Retail Branch Apr 1976, New Scientist Magazine
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Texas Instrument Ad April 1976, New Scientist Magazine
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TK Enterprises Calculator Ad, Popular Science Pg78, Oct1976
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Hewlett-Packard Ad Aug 1976, New Scientist Magazine
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Casio Ad. January 1976, Time Magazine,
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JCPenney Rockwell Calculator Ad, Sep 3,1976. The Dominion Post, Morgantown, WV
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National Semiconductor Ad, New Scientist 28Oct1976
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Radio Shack 1976 Catalog Page 116. Shows EC-375
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Radio Shack 1976 Catalog Page 117. Shows EC-415,EC-475, and EC-490 Slide Rules
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TI-56 Prorammable Slide Rule Ad. The Villanovan, September 1976
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TI And HP Slide Rule Calculator Ad. SR-50, SR-51, SR-52, SR-56, SR-16II.HP-21, HP-25, HP-22, HP-65. The Michigan Daily, March 1976
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Sears Slide Rule Calculator Ad. APF mark86, Mark88. The Michigan Daily, Sept 1976
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Highland Appliance. Slide Rule Calculator Ad. Rockwell 64RD, 74RK. TI SR-16-II, SR-50A. The Michigan Daily, Sept 1976
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University Cellar TI Calculator Ad. SR-52, SR-56, SR-51A, SR-50A, SR-30. The Michigan Daily, September 1976
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Lafayette Electronics. Kingspoint Calculator Ad SC-20, SC-33, SC-11, SC-60. Omron. The Michigan Daily, September 1976
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Hewlett Packard HP-25 Think Of As A Slide Rule The Michigan Daily, May 1976
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Texas Instruments SR-56 Super Slide Rule Ad. The Michigan Daily, September 1976
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Univ Cellar. TI Calculator Ad. SR-52, SR-56, SR-51, SR-50, SR-16II.. HP 21, HP-22, HP-25, HP-65. The Michigan Daily, March 1976
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Big Georges. TI SR-50, SR_51A Slide Rule Ad. The Michigan Daily, February 1976
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University Cellar. TI Calculator Ad. SR-50, SR-51, SR-52, SR-56, SR-16II. TI-1200. TI-1250, TI-1500, TI-2550II. The Michigan Daily, March 1976
Original Page
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HP Calculator Ad The Villanovan September 1976
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Sears APF Calculator Ad The Villanovan September 1976
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Commodore CBM SR1800 (SR-1800) Scientific Slide Rule Master Calculator. New Scientist. March 1976
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University Of Toronto Skule Yearbook 1976 pg115 - Canon Palmtronic F-7 ad
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IMAGE
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DESCRIPTION
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LITERATURE
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EXHIBIT PLACARD
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ISRM 13.01.27.09
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Binatone Junior Slide Rule Calculator
1976 - $??.??
The Binatone Junior used a CPU by
Rockwell and a single tube Futaba 9 digit
VFD displaydriven by 4.5V DC, 3 x AA size
batteries. The batteries were mounted in a
cartridge like the TI calculators. It had the
basic four functions and slide rule functions.
I like this specimen with its 'slide rule' name,
but I wondered if they were considering an
advanced 'Senior Slide Rule' with trig
functions in the future. That happened to be
the Scientific Slide Rule. Both od these were
made in Tiawan. Binatone Electronics Ltd.
was founded in 1959 by two brothers, Gulu
and Partap Lalvani, and was named after
Bina, their younger sister. Out of Wembly,
UK they specialised in importing consumer
electronics from the far east.
specialised in importing consumer
electronics from the far east.
With the running down of Sinclair Radionics in
1979, Binatone bought the stock and rights to
the Sinclair Enterprise calculators and the
Microvision televisions.
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Ebay Photo
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REF Need Specimen
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Binatone Scientific Slide Rule Calculator
1976 - $??.??
The Binatone Scientific used a CPU by
Rockwell and a single tube Futaba 9 digit
VFD displaydriven by 4.5V DC, 3 x AA size
batteries. The batteries were mounted in a
cartridge like the TI calculators. It had the
basic four functions and slide rule functions.
including trig, Made in Tiawan. Binatone Electronics Ltd.
was founded in 1959 by two brothers, Gulu
and Partap Lalvani, and was named after
Bina, their younger sister. Out of Wembly,
UK they specialised in importing consumer
electronics from the far east.
specialised in importing consumer
electronics from the far east.
With the running down of Sinclair Radionics in
1979, Binatone bought the stock and rights to
the Sinclair Enterprise calculators and the
Microvision televisions.
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Manual TBD
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Need for exhibit
|
ISRM 18.10.24.14
|
Casio FX-19 Scientific Slide Rule Calculator
1976 - £19.95
The Casio FX-19 is the first scientific model to handle fractions without using decimal equivalents. , 35 keys8 digit green display (6 digit mantissa, 2 digit exponent). 2 standard deviation programes. +/- 99 power scientific notation. All trig functions, logs, antilogs and nataural logs. 4 key independent memory.
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Manual TBD
1976 ad
|
Need for exhibit
|
ISRM 12.08.15.32
|
Hewlett-Packard HP-25C Scientific Calculator with Continous Memory, sn1806S21019
1976 (to 1978) - $200.00
An improved version of the HP-25 featuring continuous memory. Programs and data were retained
when the calculator was turned off, because the new low power CMOS memory was powered even in
the "off" state. It was even possible to change the battery pack and retain the memory because
of a capacitor inside. Users expect continuous memory today but it was an impressive upgrade
at the time. This was the first example of HP upgrading rather than replacing a calculator.
Donated to ISRM by the Huang Collection..
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Handbook to be scanned soon
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Texas Instruments Concept III Advanced Slide Rule.
1976 - $28.88
Zayre Corporation was founded in 1956 by Stanley and Sumner Feldberg in Hyannis, Massachusetts as a discount department store chain. In August 1975,Zayre launched the CONCEPT series of portable electronic calculators with the introduction of their first CONCEPT 24 and culminated in June 1976 with the introduction of the Texas Instruments CONCEPT I, CONCEPT II, and CONCEPT III calculators based on the TI-1200, TI-1250, respectfully. The SR-16 II disappeared in August 1979 with the clearance sales of the CONCEPT COMPACT calculators.
Following the path of the Slide Rule (SR) calculators like the wonderful SR-16, the CONCEPT III was called Advanced Slide Rule.
The printed circuit board (PCB) is identical to a SR-16 II.
and is based on a TMS1016 single-chip calculator circuit, a member of the famous TMS1000 Microcomputer family developed in 1974.
See Zayre CONCEPT Calculator Series
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
June 24, 1976 Ad
Sep 12, 1976 Ad
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Concept III vs TI SR-16-II (Datamath.org photo)
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ISRM 12.08.09.01
|
OMRON 88SR Slide Rule sn0062097
1975 - ¥15,800
OMRON Calculators were made in Japan
by Tateisi Electronics Co., Kyoto. founded in
1933 by Kazuma Tateisi and distributed in
the UK, Germany and the United States
through department stores like Macy's. Of
the 33 known models, only 6 had the 'SR'
suffix denoting 'Slide Rule'. As a
scientific calculator with 8 digits precision
and algebraic logic, It has 16 functions,
35 keys, 3 switches and a VFD (vacuum fluorescent)
display. The power source is 2xAA batteries.
OMRON was named for the district "Omuro"
which was originally another name for
Kyoto's Ninna-ji Temple, which is renowned
for the exquisite cherry blossoms that bloom in spring.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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Dixon's Prinztronic SR99M sn272408
1976 - $?.??
This calculator has the minimal slide rule
function of a square root key and uses a
single green Vacuum Flourescent Display
(VFD). It is operated by two AA batteries.
It was made in Japan, possibly by TEAL
(Tokyo Applications Laboratory), specifically
for Dixon's, a UK electrical retailer, like
Radio Shack, that rebranded many forms of
calculators. It uses a Texas Instruments CPU.
It is very similar to the Nestler OH 2001A, distributed by the
German company Nestler, which was a major slide rule manufacturer.
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Manual (TBD)
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ISRM 13.01.27.20
|
Privileg SR53 Electronic Slide Rule, sn015489
1975 - $?
Quelle AG was a leading department store
chain in Germany and Austria and sold
most of the electronic products under the
"privileg" brand. It is
possible that these were manufactured
by Commodore for the German market. Quelle is reported
to work out deals for calculators from Texas Instruments.
This very rare SR 53 is
the algebraic twin (with = key like TI calc-
ulators) of the privileg SR 54NC, an RPN
slide rule calculator like the first HP
calculators. It is a true scientific slide rule
with the SR prefix in the model number. It
has 8 digits precision and algebraic logic
with 28 functions, 37 keys and an Red Light
Emitting Diode display powered by 3x 1.5V
AA Alkaline disposable batteries. The
SR54NC uses 3x 1.2V rechargeable Ni-Cads.
Quelle Gmbh was liquidated in 2009 and
the rights to the "privileg" brand name was
acquired by Whirlpool.
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Manual TBD
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ISRM 13.01.27.21
|
Privileg SR54-NC RPN Electronic Slide Rule, sn41348
1975 - $?
Quelle AG was a leading department store
chain in Germany and Austria and sold
most of the electronic products under the
"privileg" brand. It is
possible that these were manufactured
by Commodore for the German market. Quelle is reported
to work out deals for calculators from Texas Instruments.
This very rare SR 53 is
the algebraic twin (with [=] key like TI calc-
ulators) of the privileg SR 54NC, an RPN
slide rule calculator like the first HP
calculators. It is a true scientific slide rule
with the SR prefix in the model number. It
has 8 digits precision and algebraic logic
with 28 functions, 37 keys and an Red Light
Emitting Diode display powered by 3x 1.2V rechargeable Ni-Cads, as noted by the "NC" suffix in the model name.
The SR53 uses 3x 1.5V AA Alkaline disposable batteries
Quelle Gmbh was liquidated in 2009 and
the rights to the "privileg" brand name was
acquired by Whirlpool.
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Manual TBD
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Texas Instruments TI-1220 True Value Hardware snA130186
April 1976 - $9.95
The TI-1220 was a TI-1200 produced exclusively for the True Value Hardware store chain.
Its now the cheapest calculator out there, viewed by thousands of shoppers, just ripe for an impulse buy.
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US Manual (2.2Mb)
EU Manual (3.39Mb)
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Texas Instruments TI 1270 Electronic Calculator with Memory sn0251139
April 1976 - $18.95
The colorful TI-1270 was introduced as a late member into the growing TI-1200 family.
At this point in the 4th generation of hand-held calculators, some say it is only a basic calculator,
even though it has slide rule functions making it suitable for scientific calculations.
Compare it with the SR-11, introduced only 2 years earlier as a powerful 'slide rule'
calculator costing $100 more. The European model is the TI-1250.
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US Manual (2.2Mb)
EU Manual (3.39Mb)
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Texas Instruments SR-56 sn027562
May 1976 - $179.95
Introduced only few month after the SR-52
programmable, which had a card reader,
the SR-56 was it's small brother any was
'key' programmable. The housing looked
identical to the SR-51A, only the LRN-key
gave you an idea of it's programmability.
Compared to the SR-52 it uses only one
instead of two memory-chips, reduceing
the possible program length from 224 steps
to 100 steps. Main disadvantage was the
lack of a permanent memory storage like a
card reader, but it was less than half the cost of an SR-52.
The box and manual was printed with
'Slide Rule' but not the marketing literature.
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Manual TBD
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Texas Instruments SR-40 Electronic Slide Rule sn1243657
June 1976 - $49.95
Uses a new manufacturing approach within Texas Instruments. Everything is snapped
together, no screws within the whole calculator. Comparable to the previous SR-50A and the later TI-30.
This can use a standard 9V battery.
Donated to ISRM by Ted Hume, San Angelo, Texas
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Manual (5.05Mb)
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ISRM 12.04.10.01
|
Texas Instruments TI Business Analyst sn7753056
June 1976 - $49.95
The Business Analyst was the first in a successful line targeting financial calculations.
It continued with the facelifted Business Analyst I, the LCD model Business Analyst II and
you'll find in each scientific/programmable epoch a financial variant. Along with many
'slide rule' functions the BA was able to perform 5 different calculation modes: Standard
math, Annuities, Compound interest, Profit margin, Linear regression. No mention
of slide rule in literature but there were plenty of slipsticks that could do these calculations as well.
Donated to ISRM by the Huang Collection.
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Manual (5.6Mb)
Leaflet (1.9Mb)
|
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ISRM 18.10.24.02
|
Texas Instruments SR-56P
Late 1976 - $139.95
SR-56P Programmable had lower price from the SR-56 and the word 'Programmable'
located under the model number.
1975 vs 1976 SR-56, and BP-1 Battery Pack repair
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Manual TBD
Box Cover
|
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Texas Instruments SR-51-II advanced slide rule calculator sn6558606
June 1976 - $224.95
The advanced slide rule calculator is a very interesting hybrid. It used the packaging of the SR-51A
and the advanced chip of the future TI-55. This is the last TI calculator to use the 'SR'
prefix in its model number.
Donated to ISRM by the Huang Collection.
Note: This calculator in INOP. so an image was used from another. A donation of a working replacement would be appreciated.
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Manual (10.9Mb)
|
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ISRM13.01.27.11
|
Commodore SR-5190R Scientific/Stat Slide Rule sn005434
1976 - $?
Commodore Business Machines, founded in
1955, was one of the more popular brands
of calculators produced in the 1970's. They
relied on chips from Texas Instruments until
TI jumped into the calculator business. The
complex SR5190R was made in England
is a full electronic 'Slide Rule' with the 'SR'
prefix. The 'R' suffix denotes 'rechargable'.
The 5190 represented the number of keys
and functions, although there are 49 keys,
with another 42 functions, 91 total, plus a power
switch. It performs arithmetic and scientific
operations, with memory, and also metric
conversions and statistical functions. A slide
rule aficianado would have loved this one as
it took the place of 3 slipsticks! It has a 14
digit red LED (11 mantissa + 2 exponents
and a deg/Rad indicator). The label on the back reccommends
using AC adaptor no. DC.640 or 707 or 708 or 709,
which provide 6V at 300ma. This unit came from Greece
(with no batteries should have 3 1.2V AA NiCads) but with
a 220VAC adaptor 6VDC output. It tested OK when jumpered with 6V.
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Manual TBD
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Commodore SR-1800 Electronic Slide Rule Calculator sn80383
1976 - 29.95Bp
Commodore's advanced scientific slide rule models include the SR-1800,
which has a green fluorescent display and a stylized wedge-shaped case.
It has a shift key for increasing the number of functions available to the user.
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Manual TBD
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Commodore 9R25 Portable Mini Computer sn17034
1976 - $??.??
The 9R25 Portable Mini Computer, assembled in England with Japanese components,
has the basic slide rule functions but not much else. Its claim to be a
'Mini-Computer' was a bit exaggerated, especially since there was no programming capability,
but it does give us foresight into where Commodore Business Machines was heading.
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Manual (5.07Mb)
|
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ISRM 13.01.27.14
|
Commodore GL-997R Portable Electronic Memory Calculator
1976 - $??.??
The Commodore GL-997R Portable Electronic Calculator is an arithmetic
calculator with memory functions and percent key. It has 8 digits
precision and algebraic logic with 23 keys and a VFD (vacuum
fluorescent) display. The power source is rated at 4.5V in a
sealed battery pack with 2 nicads. The recommended adapter is the CBM DC-420B. It was
manufactured in Japan and was part of
Commodore's 'Custom Green Line' because of the green VFDs.
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|
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Privileg SR58D-NC Electronic Slide Rule, sn42902
1976 - $?
The Privileg SR58D-NC Elektronik-Rechner
(aufladbar) is an electronic slide rule
with 8 digits precision and algebraic logic.
It has 25 scientific functions, 35 keys and a
VFD (vacuum fluorescent) display.
The power source is 3x 1.2V AA rechargeble Ni-Cad batteries ("NC" suffix in model number). It is
possible that these were manufactured
by Commodore for the German market
and distributed by Quelle International,
a German chain store. Quelle is reported to work out deals for calculators from Texas Instruments.
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Manual TBD
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Soviet (Russian) Elektronika sn078092
1976 - $??
The non-USA companies were slow on the catching up, but by 1976 there were scientific calculators
popping up out of Russia, Japan and Germany. This is one of the first to come out of the Soviet bloc. It came with a 220VAC adaptor.
They use button /disc/can/lozenge/land-mine shaped batteries, 33mm dia x 9mm thick, that they call D-0.55C (B3-18A, B3-19M, B3-21, B3-34 calculators).
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Manual TBD
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Soviet (Russian) Elektronika
1976 - $??
Another version of the Soviet Slide Rule Calculator. This is a typical example of the Soviet GOST standards to be followed amongst different factories (Leningrad, Unkraine, Romania) to be identical but with with minor variations in implementations and design.
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Manual TBD
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WANTED
for Exhibit
|
ISRM 18.10.24.16
|
Silver-Reed SR82S Slide Rule Calc sn0033985
1976.
Silver Reed Ltd. began operations as
Marukoshi Knitting Machines Ltd. in Tokyo
in the 1950s and in 1967 the company name
was changed to Silver Seiko Ltd. It claims to
be the first company to sell electronic home
knitting machines as early as 1977, and, as
as their technology, began selling rebranded
calculators and electric typewriters.
This model, clearly marked "Slide Rule" on the fascia, has all the basics of a Slide Rule calculator with 'SR' in the model number. The model SR82S is an arithmetic calculator with 8 digits precision and algebraic logic. It has a total of 30 keys with 12 functions, including 1/X, (,), X/Y, +/-, X2, %, and SQRT, plus 5 memory keys. The green VFD display is powered by 3x AA batteries.
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Manual TBD
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Texas Instruments TI-2550-III Memory Calculator sn253073 MTA4677
1976 - $24.95 (£24.95)
This version replaced the TI-2550-II in a few
months to add the [+/-] key, but eliminated
the [F/2] decimal point switch. Both used a
blue VFD (Vacuum Fluorescent Display)
which, prior to these TI models, were only
used in Japanese made calculators. Cost
optimized, this calculator used one AA NiCd
in the BP-3 battery pack, since then VFD
required less voltage than the TI Red LEDs
of other TI models. The operating time was
very short.
Donated to ISRM By the Huang Collection
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Manual (2.75MB)
BP-3
|
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Texas Instruments TI-30 Scientific (Electronic Slide Rule) sn244096
June 13, 1976 - $24.95
This is the defining moment of the death of the slide rule. When the TI-30 was released it was the same price as a high-end advanced slide rule like the K&E 4181-3, (the slide rule only has a total of 11 unique parts so this was amazing).
Inside the TI-30 is identically to the SR-40, the massive cost reduction was the sum of two details: The rechargable battery pack was replaced by a simple 9V cell and the molded lettering of the coloured keys replaced by a printed key plate. Battery consumption of the TI-30 was horrible. Probably the best selling calculator ever with about 15,000,000 manufactured units between 1976 and 1983.'SR' prefix dropped in favor of 'TI'. This is one of the last TI calculators that mentions 'SLIDE RULE' in its literature. "..the powerful 48-function TI-30 slide rule calculator.". In 1980, Texas Instruments converted the TI-30 to use an LCD display, and the TI-30 II a year later in the U.S. The calculator itself remained functionally similar over the years, with solar power coming in 1982. The TI-30X IIS 2-Line Scientific Calculator is currently issued to incoming freshmen at the US Air Force Academy and is nicknamed the "Honorator" as its lack of programmability does not allow the storage of answers in memory.
Original owner: Nick Ingala (Scratched on back in two places)
Donated to ISRM by Ted Hume, San Angelo, Texas
Wanted: TI-30 with date code of ATA 2476
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Manual (4.04MB)
|
|
ISRM 12.04.10.11
|
Hewlett Packard HP-67 Programmable sn1612S03885 (1976, week 12, Singapore)
Jan 7, 1976 - $450
This was HP's last Classic model and is the most powerful hand held calculator model that HP produced.
It used magnetic cards as non-volatile storage for programs.
HP code name was 'Hawkeye and uses the same Classic battery packs and chargers as the HP 35,45, 55 and 65.
An HP Catalog described them as "A major leap forward in fully-programmable personal calculators".
The HP-67 packed so many functions on to a small keyboard that three (orange [f], blue [g] and black [h])shift keys were needed.
It has a 13 digit with plus sign 7 segment red LED display and 26 volatile memories. Its programmable with
224 steps, fully merged, labels A-E, a-e and 0-9, program editing. Benchmarks showed that it was slower than the HP-65
but that is normal when you take the same CPU technology and load it up with more applications. Yet another candidate for "best calculator ever". The magnetic card reader gives access to numberless software libraries;
This particular specimen was acquired out of Salisbury, Wiltshire, United Kingdom and owned by Michael Barnes, assumed to be an aerospace engineer whose company provided this to him when it was still relevant technology. From the labels there are references to Folland (aircraft) Gun and Ejection Seat calculations, but the Folland was made over a decade before the HP67 but was bought by BAE who built components of the Harrier VTOL Jet. The Folland designs may have been used in newer aircraft. There is 4 albums of mag cards with this unit. Along with the Standard Pac (15 mag + cleaning card)
and M.E. Pac I (26 Mag cards), The owner programmed 73 additional mag cards relating to his work.
There were 30 cards left blank in his albums.
Obtained with the assistance of Rod Lovette, UK
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Handbook to be scanned soon
New Scientist 7Oct1976
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|
REF
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Omron 12SR RPN Scientific Calculator
1976
This Scientific Calculator 12SR, with the 'slide rule' suffix, was manufactured by OMRON Tateisi Electronics of Japan.
OMRON calculators are a class by itself and built like a tank. The keyboard, the housing,
even the battery compartment are from a different quality than your average calculator from
the 70s. Mostek, the chip maker of the original Hewlett Packard HP 35 and dozens of other
early HP calculators, introduced in 1975 a sensational set of Integrated Circuits with the
MK50075A "Data Processor" and two sets of ROM's with 1k*15bits, each, defining the algorithm
of the product: MK50101/MK50102: Financial calculator and MK50103/MK50104: Scientific calculator
We know only six calculators based on the MK50075A and MK50103/104 chip-set:
APF Mark 55, Corvus Model 500 and its twin Emerson E12, this Omron 12SR,
the Sanyo CZ-2901 and Privileg SR54NC.But they all have two things in common: RPN and superior performance.s.
Image and text Courtesy of Joerg Woerner
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Manual TBD
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ISRM 16.03.10.01
|
Rockwell 64RD Electronic Slide Rule Calculator sn103013-086r
1976
Rockwell was a prime contractor to the NASA Space program, manufacturing semiconductors as well as claculators. Their most advanced "slide rule" scientific calculator for scientists and engineers was the 64RD, made in Japan, sporting a 12 digit easy-to-read VFD green display. It had two key memory, 8+2 scientific notation, Log, Trig and exponential functions, and Parenthesis. Trig functions in degrees, radians or grads. Polar co-ordinate conversion. The front does not mention slide rule, but the serial nummber label on the back states "Electronic Slide Rule Calculator". It requires 6v (4x AA batteries). Note: It is the same as the House of Fraser 64HF.
Gift of Manny and Marti Leinz.
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Manual TBD
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 HOF 64HF
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Archive - Need for Exhibit
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House Of Fraser 64HF Slide Rule Calculator
1976
A rebranded Rockwell 64RD, made in Japan. House of Fraser is a retail department store established in 1849 in Glasgow, Scotland. Along with clothing and other soft goods they also sold electronics, under their name. The 64HF has a 12 digit easy-to-read VFD green display. It had two key memory, 8+2 scientific notation, Log, Trig and exponential functions, and Parenthesis. Trig functions in degrees, radians or grads. Polar co-ordinate conversion. The front does not mention slide rule, but the serial nummber label on the back states "Electronic Slide Rule Calculator". It requires 6v (4x AA batteries).
Image from Nigel Tout Collection.
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Manual TBD
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IMAGE
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DESCRIPTION
|
LITERATURE
|
EXHIBIT PLACARD
|
ISRM 13.02.02.01
|
Canon Palmtronic Multi-8 Calculator with Dual Display sn629605
1977 - $??
Made in Japan by the Canon Camera company, the 20 key Multi-8 is a landmark calculator,
the first to use two lines in its blue VFD display. It has a square root key, along with % and memory functions, which puts it in the slide rule catagory. The switch to the left of the display is used to select the number in the memory, or a single line display. Like many other Canons, it uses the Texas Instrument chip set. It operates with 3 AA batteries.
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Manual
|
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ISRM 13.02.02.01
|
Commodore SR-9190R Electronic Slide Rule Calculator sn144629
1977 - $48.88
Made in England based on Commodore's
MOS chip designs. This 49 key Scientific
Slide Rule, has over 117 directly accesible
functions with a 14 digit red LED display
powered by 3x N450AF rechargable NiCad
batteries (Adapter DC-505, 707, 708 or 709).
This model was late in the game and was
one of the last models produced before
Commodore abandoned calculators
for Personal Computers. The keyboard has
grey-scale keys which is a departure from
their red-white-blue of the past, which were
copied by many Hong Kong manufacturers.
This calculator had a lot of bang for the buck.
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Manual (500Kb)
Popular Science Nov 1977
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ISRM 12.08.15.32
|
Hewlett-Packard HP-29C Programmable Scientific Calculator with Continous Memory, sn1806S20184
1977 (to 1979) - $195.00
The HP-29C was the top high-end model and last of the 20 series calculator. It had 98 program steps with fully merged keycodes
and 30 storage registers. 16 were directly or indirectly addressable and the rest were only indirectly addressable.
The recently developed continuous memory allowed information to be kept intact even when the calculators were off. The entire program space, and the X register were continuous, but the rest of the stack was volatile. Memory registers were split. The 16 directly addressable registers were continuous whereas the other 14 indirectly addressable registers were volatile.
Donated to ISRM by the Huang Collection..
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Handbook to be scanned soon
|
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ISRM 13.01.27.22
|
Silver-Reed 80 Electronic Calculator sn80985517
1977 - $unknown
Silver Reed Ltd. began operations as
Marukoshi Knitting Machines Ltd. in Tokyo
in the 1950s and in 1967 the company name
was changed to Silver Seiko Ltd. It claims to
be the first company to sell electronic home
knitting machines as early as 1977, and, as
as their technology, began selling rebranded
calculators and electric typewriters. The
80 has the basic slide rule functions of 1/X,
X^2, SQRT, % and Pi keys. the 1st version
of the SR80's did not have any, the 2nd
version had just a SQRT key. This was
made at the time when calculators were
getting away from identifying themselves
with slide rules, so it it interesting that the
'SR' prefix was dropped, even though it
had more slide rule functions than the SR80.
Maybe SR was not there as the company
initials? This calculator uses only 1 AA
battery driving the green VFD display as IC's
were getting less power hungry.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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Ebay Photos
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Silver-Reed SR104 Slide Rule Calc
1977
Silver Reed Ltd. began operations as
Marukoshi Knitting Machines Ltd. in Tokyo
in the 1950s and in 1967 the company name
was changed to Silver Seiko Ltd. It claims to
be the first company to sell electronic home
knitting machines as early as 1977, and, as
as their technology, began selling rebranded
calculators and electric typewriters, mostly in Europe.
The SR104 is a full Slide Rule calculator with 'SR' in the model number, although you could make the case it stands for "Silver-Reed". The model SR104 is an arithmetic calculator with 8 digits precision with exponents. It has a total of 37 keys with 29 functions using an INV key The green VFD display is powered by 3x AA removable batteries.
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Manual TBD
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ISRM 12.08.21.00
|
Texas Instruments TI-55 Advanced Slide Rule Calculator with Statistical Functions and Progammability, sn2373004
1977 - $??.??
On the cover ofthe brochure: "Advanced Slide Rule Calculator with Statistical Functions and Progammability". 'SR'
prefix dropped in favor of 'TI'. This was a great calculator for mechanical designers and engineers as it included metric conversions.
From a technical aspect the TI-55 continued the ideas of the SR-40 with three main differences:
The LED-stick using LED chips mounted and bonded to the printed circuit board, was expanded to
12-digits instead of the 9-digits. The ON/OFF key was replaced by a mechanical slider and the
battery connector was changed from a 9V battey style to a small 3-pin header connected to a BP-7 battery pack which had a single 1.2V NiCd in it. A capacitor circuit is charged to bring the voltage up to 9V. Although
the usage of cheap 9V batteries wasn't possible, it is an easy conversion to re-wire these. More at datamath
The TI-55 was marketed in Europe and South America as the TI-51-III, made in Italy and Brazil.
Donated to ISRM by the Huang Collection.
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Manual (10.5MB)
Brochure (2MB)
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Baccyflap.com Photo
|
Texas Instruments TI-51-III Advanced Slide Rule Calculator with Statistical Functions and Progammability
1977 - $??.??
.
The TI-51-III is the non-USA version of the TI-55 which continued the ideas of the SR-40 with three main differences: The LED-stick using LED chips mounted and bonded to the printed circuit board, was expanded to
12-digits instead of the 9-digits. The ON/OFF key was replaced by a mechanical slider and the
battery connector was changed from a 9V battey style to a small 3-pin header connected to a BP-7 battery pack which had a single 1.2V NiCd in it. A capacitor circuit is charged to bring the voltage up to 9V. Although
the usage of cheap 9V batteries wasn't possible, it is an easy conversion to re-wire these (Note: Black wire is +, Red is -). More at datamath
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Manual (10.5MB)
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Wanted for
Exhibit
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ISRM 12.08.16.17
|
Texas Instruments TI Programmable 57 sn6749896 LTA4677
May 1977 - $79.95
Programmable 57 Slide Rule Calculator.. 'SR' prefix dropped in favor of 'TI'.
Introduced together with the TI-58 and TI-59 the TI-57 represented the low budget
programmable calculator of that epoch and replaced the SR-56. Unbelievable that
this powerful calculator made use of the one-chip approach of the SR-40 calculator.
This is the last TI calculator that mentions 'SLIDE RULE' in its literature.
The TI-58 and TI-59 literature does not, they compare themselves with computers,
instead. By October 1981 the price on this was $39.95.
Donated to ISRM by the Huang Collection.
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Manual TBD
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ISRM 12.08.16.38
|
Texas Instruments TI Programmable 58 sn3757137 LTA4877
May 24, 1977 - $124.95
Programmable 58 Slide Rule Calculator. 'SR' prefix dropped in favor of 'TI'.
Introduced together with the TI-58 these calculators introduced the Solid State Software Modules,
with up to 5000 program steps. On the backside of the TI-58/59 is a small
lid with a place for a drop-in module. The Master Library with 25 different programs
was included and more modules directed at specific disiplines and operations were also available.
Compared with the SR-56 the memory space was raised by a factor of four, sporting up to 60 memories
or 480 program steps. A new flexible aproach allowed the conversion of 1 memory to 8 program steps,
base configuration was 30 memories and 240 program steps.
Donated to ISRM by the Huang Collection.
Note: This particular specimen had broken battery contacts and was repaired by soldering a set
of connector cables to a rebuilt battery pack with 3 new NiCds. See photo on right.
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Workbook (20.9MBkb)
Brochure (4.1MBkb)
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|
ISRM 12.04.10.08
|
Texas Instruments TI Programmable 59 sn9437640
May 24, 1977 - $299.95
Programmable 59 Slide Rule Calculator.. 'SR' prefix dropped in favor of 'TI'.
Introduced together with the TI-58 these calculators introduced the Solid State Software Modules,
with up to 5000 program steps. On the backside of the TI-58/59 is a small
lid with a place for a drop-in module. The Master Library with 25 different programs
was included and more modules directed at specific disiplines and operations were also available.
An even greater program collection for the TI-59 resulted from the Professional Program Exchange
(PPX-59) initiative started in November 1977. By November 1981 the price was reduced to $180.00.
Donated to ISRM by Jeff Illsman, Longmont, Colorado
|
Workbook (20.9MBkb)
Brochure (4.1MBkb)
|
|
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Texas Instruments TI-1025 snNone
June 1977 - $11.77
Introduced together with the TI-1000 this one uses a (Japanese) green vacuum fluorescent display
a departure from TI's red LEDs. The calculators were manufactured either in El Salvador, Hong Kong, Spain or USA.
Calculators with different nameplates were sold from Western Auto as Citation and the Dutch department store HEMA.
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Manual (949Kb)
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Nestler OH1002A slide rule calculator snNone
1977 - $unknown
The German company Albert Nestler KG was one of world's most respected slide rule makers,
and the favored choice of many rocket scientists like Wernher von Braun and Sergei Korolyov as well as Albert Einstein,
This basic slide rule calculator, with a square root key, was Nestler's attempt to move into the electronic slide rule market.
The Nestler family was caught by surprise when calculators emerged on the scene, and they were unable to adapt to save the company
when their products and manufacturing equipment became obsolete by 1977. They went to Japan (possibly to Tokyo Applications Laboratory)
to create a line of calculators,
but having to rely on outside semiconductor technology they were unable to create a sufficient market share to maintain their factories.
Consequently they had to lay off their entire German workforce. This unit uses two AA batteries driving a green VFD display.
Juergen Nestler, the great grandson of the founder Albert Nestler, is a generous contributor and friend to ISRM.
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Manual TBD
|
|
ISRM 12.08.09.03
|
Nestler T52 slide rule calculator sn102280
1977 - $unknown
The German company Albert Nestler KG was one of world's most respected slide rule makers,
and the favored choice of many rocket scientists like Wernher von Braun and Sergei Korolyov as well as Albert Einstein,
This basic slide rule calculator, with a square root key, was Nestler's attempt to move into the electronic slide rule market.
The Nestler family was caught by surprise when calculators emerged on the scene, and they were unable to adapt to save the company
when their products and manufacturing equipment became obsolete by 1977. They went to Japan (possibly to Tokyo Applications Laboratory)
to create a line of calculators,
but having to rely on outside semiconductor technology they were unable to create a sufficient market share to maintain their factories.
Consequently they had to lay off their entire German workforce. This unit is similar to the earlier Nestler model OH1002A but with different packaging. It also uses two AA batteries driving a green VFD display.
Juergen Nestler, the great grandson of the founder Albert Nestler, is a generous contributor and friend to ISRM.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
|
Manual TBD
|
|
ISRM 12.08.09.02
|
OMRON 8SR Slide Rule snH0701485
1977 - $29.10 (¥7800)
OMRON Calculators were made in Japan
by Tateisi Electronics Co., Kyoto. founded in
1933 by Kazuma Tateisi and distributed in
the UK, Germany and the United States
through department stores like Macy's. Of
the 33 known models, only 6 had the 'SR'
suffix denoting 'Slide Rule'. This one is a cost
reduced version of the 1975 modell 88SR, using less power as well.
As a scientific calculator with 8 digits precision
and algebraic logic, It has 21 functions,
20 keys and a VFD (vacuum fluorescent)
display. The power source is 2xAA batteries.
OMRON was named for the district "Omuro"
which was originally another name for
Kyoto's Ninna-ji Temple, which is renown
for the exquisite cherry blossoms.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Brochure (1.2Mb)
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|
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Brother 512SR Slide Rule snB6008511
Circa 1977 - $unknown
This 40 key scientific slide rule calculator
was made in Japan by Brother Industries, Ltd., of Nagoya, Japan, using NEC chips. Brother is better known for its later daisy wheel electronic typewriters, sewing and facsimile machines. It began selling products into the US in 1954. This model uses four AA batteries and
the display is an 8-1/2 digit blue VFD (Vacuum Flourescent Display) plus 2 -1/2 digits for scientific notation and minus sign.
It has "sin, cos, tan, sinh, cosh, tanh, asin, acos, atan, asinh, acosh, atanh, , EXP, ln, log, e^x, 10^x, y^x, 1/x, Pi, Sqrt, x^2, +,-, x<>y, CM, RM, ME" keys
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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ISRM 18.01.18.01
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Radio Shack EC-245 Statesman Thin
1977 - $34.95
The Radio Shack (Tandy Corp) EC-245 is advertised as a check book size calculator with
4-key memory. It has the minimum slide rule functions of square, sqr root, inv, +/-, % keys. Extra large green "Digitron" display. Internal Nicad battery cellc with AC adaptor Model 6100.
This one is made in Taiwan. The unit works but the keys and package are damaged.
Gift of Dr. Christopher Fink, PhD of of Fredericksburg, Virginia.
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Manual TBD
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ISRM 12.06.23.03
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Radio Shack EC-420 Slide Rule Calculator sn0034958
Early 1977 - $19.95
The Radio Shack (Tandy Corp) EC-420 is advertised as a Slide Rule Calculator with
Pi Key. It first appeared in the 1978 catalog with cat #65-636, which was mailed out late 1977,
and then repackaged along with the EC-421, where it was given cat #65-636A. See the catalog page.
This one is made in Taiwan.
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Manual TBD
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Radio Shack EC-421 Slide Rule Calculator sn003662
September 30, 1977 - $19.95
The Radio Shack (Tandy Corp) EC-421 is advertised as a Slide Rule Calculator with
four-key memory. It appeared in the 1978 catalog with cat #65-642, which was mailed out late 1977.
This one is made in Taiwan.
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Manual TBD
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Radio Shack EC-495 Scientific Slide Rule Calculator sn003662
September 30, 1977 - $39.95
The Radio Shack (Tandy Corp) EC-495 is advertised as a Scientific Calculator with
five memories plus statistics and math. It was alongside other calculators called 'slide rule'
but this one had more advanced functions. This was available in 1977 It appeared in the 1978 catalog with cat #65-642, which was mailed out late 1977.
This one is made in Taiwan.
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Manual TBD
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Perfect 100SR Slide Rule Calculator sn142882
1977 - $5.99
This generic (basic) slide rule calculator was produced by the OEM (Original Equipment Manufacturer) Futaba (printed on the chip) in Hong Kong and the package design was sold under various brands. This one was distributed in Germany as evident by the "2x1.5V Mignonzellen" in the battery compartment.
It has the basic slide rule functions which are %, pi, 1/x and sqr root, uses two AA batteries. Unfortunately, this specimen is inoperative, and is the only one known to exist on the web.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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Texas Instruments "The MBA" sn6887124
August 1977 - $79.95
The MBA gave you advanced financial and statistical functions and targeted the market above
the Business Analyst. The brown housing gave the calculator a very exclusive note.The
relation between a SR-40 and the TI-55 could easily be found with the Business Analyst
and The MBA. Both the TI-55 and The MBA use a 12-digit LED-stick and a single-chip
design and the mechanical ON/OFF slider. It is able to learn repetitive keystrokes.
By October 1981 the price on this was $60.00.
Donated to ISRM by Jeff Illsman, Longmont, Colorado
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Manual (2.7Mb)
Leaflet (2.1Mb)
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Texas Instruments TI Programmer sn3719449
August 1977 - $42.50
This calculator is dated from 1979 and was popular with computer programmers to convert Decimal, Hexadecimal Octal numbering systems. A merging of technologies from slide rules to personal computers. From the Introduction in the Owner's Manual: Your Calculator is designed to perform fast accurate calculations in base 16 (hexadecimal), base 10 (decimal) and base 8 (octal) number systems and to provide conversions from one base to another. Small size and simple operation with arithmetic and logical operation capability make it ideally suited for applications in computer programming, operations, and study, including minicomputer and microcomputer applications.
Donated to ISRM by the Huang Collection.
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Manual (2.7Mb)
Guide (2.1Mb)
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Sharp ELSI Mate EL-500 sn62092590
1977 - $??.??
This Japanese calculator with full slide rule functions uses an 8 digit green VFD with a ninth digit for negative and error indicators.
Standard four functions with change sign, powers, reciprocal, square root, DMS input, pi, trigs, logs and three-function memory. 6+2 scientific display mode. It uses two AA batteries. Sharp will become a major player in the calculator industry, outlasting most of it competitors, except for Casio, TI and HP.
Donated to ISRM by Scott Reynolds of
Vintage Calculators Inc
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Manual TBD
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Dec 1977 Ottawa Citizen Ad
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Sharp Elsimate EL-5804 Electronic Slide Rule sn74291520
Late 1977 - $39.95
A late arrival onto the 'Slide Rule' calculator scene was this long, narrow and thin
scientific calculator that resembled the shape and feel of a conventional slipstick.
A 1977 Willson ad states: An Electronic Slide-Rule That Looks Like a Slide-Rule.
It is 179mm long, 46mm wide and only 7mm thick. Two of these put together were used as props for the
Battlestar Galactica Original TV Series Viper pilot Hero leg computer. The prop was
constructed of metal parts, a cloth strap with Velcro and two calculator keypads.
Worn by Maren Jensen as "Athena". This calculator was only produced for one year.
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Manual TBD
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Battlestar Galactica
Hero Leg Computer
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IMAGE
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DESCRIPTION
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LITERATURE
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EXHIBIT PLACARD
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ISRM 12.08.15.39
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Hewlett Packard HP-41CV Alphanumeric Programmable Calculator sn2324S42918
1980 - $325
The HP-41CV was the same as the HP-41C except that it had four memory modules built in for a total of 319 registers. (With the four ports still available to add other modules.) Like the HP-41C, It had four expansion module ports at the top end which could add memory or a wide selection of specialized programs. These calculators could be attached to external HP-IL disk and tape drives as well as printers.
Donated to ISRM by the Huang Collection.
Note: This calculator in INOP.A donation of a working replacement would be appreciated.
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Handbook to be scanned soon
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TBD
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ISRM 19.02.09.01
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Texas Instruments Slimline TI-25 Pocket Scientific Electronic Calculator sn561356
1978 - $ $27.95
This "Slide Rule" calculator is part of a new generation of Slimline Calculators being designed by TI with LCD display. The first ones were built in Japan. It has a 'Constant Memory'. Values stored in registers are retained when the power is off.
The TI-25-II uses Toshiba T3763 electronics and powered by two LR44 batteries. It only weighs 3 ounces.
It called a "Slide Rule" Calculator in the description section of the manual.
Belonged to Carroll Kressel of Tennessee
In the late 1960's while in the Air Force (1963-1967),He was trained as an automatic flight controls/Guidance tech on B52's and KC-135's. Carroll enrolled in Cleveland Institute of Electronics (CIE) mail-order course which supplied Pickett 515 slide rules, After being discharged, he worked for Chryler, Lockheed Martin (on the C-5A), Esterline Angus, and ended up designing Printed Circuit Cards.He purchased this TI-25 sometime in 1978.
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Manual (6.5Mb) Datamath
Box
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TBD
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ISRM 12.08.16.05
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Texas Instruments Slimline TI-30-II Electronic Slide Rule Calculator
1982 - $18
This popular combination of practical scientific functions gets another new life in the packaging
of the 'Slim-Line' calculators and gains a 'Constant Memory'. Values stored in registers are retained when the power is off. This is the second edition of the one released in 1981
The TI-30-II uses the electronics of the European TI-30 LCD and the two shell housing of the TI-35. It uses two LR44 batteries.
Suprisingly, in 1982 and beyond, it still calls itself a 'Slide Rule' Calculator as seen on the cover of the manual.
Donated to ISRM by the Huang Collection..
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Manual (6.13Mb)
Manual Cover
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ISRM 19.02.11.01
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Texas Instruments TI-35 Constant memory Slide Rule Calculator sn2889149
1982 - $$24.95
A continuation of the Slimline Series. This one is made in the USA. Values stored in registers are retained when the power is off. This is the second edition of the one released in 1981
The TI-30-II uses the electronics of the European TI-30 LCD and the two shell housing of the TI-35. It uses two LR44 batteries.
It calls itself a 'Slide Rule' Calculator inside the description section of the manual..(Courtesy of Joerg Woerner, Datamath Calculator Museum).
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Manual (6.38Mb)
Manual Cover
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Texas Instruments SR-40 LCD
1980 - $unknown
A Late arrival. The last TI with SR in the model name. The SR-40 resurrected with a Liquid Crystal Display (LCD). The original
SR-40 (1976) had red LED's. Since 'SR' is in the model name, we list it here as one of the last TI slide rule calculators.
This model was produced only in Brazil under license of TI to Indústrias Gerais da Amazonia S.A.*, and because of export limitations was not available elsewhere. It is comparable to the European TI-30 LCD, with modified shell and sleeve.
*Indústrias Gerais da Amazonia manufactured in the Manaus Free Zone different calculators like the rare SR-40 LCD under license of Texas Instruments. Due to various barriers to trade most foreign companies established in Brazil some kind of off-shore production. Already in 1957 by parliamentary initiative the "Zona France de Manaus" was created in the Municipality of Manaus, State of Amazonas: the Geographic Center of the Western Brazilian Amazon. Grounded on federal, state and municipal fiscal incentives, the project included the creation of an industrial, commercial and agricultural and cattle raising center. Today there are more than 600 industries, using competetive technology in the production of electro-electronic, computer science, professional equipment, photocopiers, telephone receivers, fax, and telecommunications used all over Brazil.(Courtesy of Joerg Woerner, Datamath Calculator Museum).
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Manual TBD
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WANTED
for Exhibit
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ISRM 13.05.05.03
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Texas Instruments TI-55-II-LCD Advanced LCD Slide Rule Calculator
1981-84 - $50.00
BUT WAIT, THERE'S MORE!
Just when we thought that 'Slide Rules' were totally forgotten by the calculator industry, Texas Instruments, in
1981, reminded us where it all started by added a new LCD calculator to the slimline series.
Its a TI-55 resurrected with an angled Liquid Crystal Display (LCD) and 45 keys. The original
in 1976 had red LED's and 40 keys. We did not think this qualified to be in the gallery, but when the retail box was discovered, it clearly stated "advanced LCD slide rule calculator with programming and statistics". Datamath.org had a leaflet which showed the same text, but interestingly enough, the manual does not mention slide rule.
We list it here as the LAST TI slide rule calculator. The TI-55-II features are 112 powerful functions
for professional engineering, science, and mathematical applications. Modern, functional styling.
TI 55-II Student Math Kit Brochure
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Leaflet (2.16Mb)
Taiwan Printed
Manual (1.4Mb)
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USA Printed
Manual (2.33Mb)
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ISRM 12.08.16.07
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Texas Instruments TI Business Analyst II, sn1355958 ATA0582
1978 - $40.00
The Slime-Line Majestic series Texas Instruments started with the TI Business Analyst II with Constant Memory to
introduce a financial counterpart to the scientific calculator. Manufacturing cost of
the slimline models was inexpensive as the entire calculator uses one flexible printed
circuit board (Flex-PCB) with the integrated circuit and a LCD-module. There is no
soldering or screws fasteners within the calculator. As with all the Slim-Line series it uses 2 LR44 batteries.
Donated to ISRM by the Huang Collection..
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Manual (5Mb)
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Texas Instruments BA-II Executive Business Analyst snLTA0886
1984 - $unknown
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Manual TBD
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Not for Exhibit
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Aurora LCD-6
c1980 - $?
This calculator with the minimal slide rule function of a sqr root key, +/-, and %, has a
LCD screen and is operated by a 2 AA Alkaline Batteries. The Aurora company was founded in 1975, and this particular specimen uses a SHARP CPU.
Donated to ISRM by Jeff Illsman, Longmont, Colorado
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Manual TBD
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Not for Exhibit
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ISRM 12.06.14.01
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Sharp EL-8048 Sorokaru (Soroban-Calculator) sn001
January 1979 - ¥5500
Just as there was a delay in the acceptance of electronic slide rule calculators in the western world, the Japanese were reluctant to give up their Soroban's for the calculator without double-checking their answer on their Soroban Sharp's answer was the combination abucas/calculator. This early version was made in Japan. It uses a single 9V battery with Dimensions: 307 (W) x 87 (D) x 22 (H) mm. 310g. The
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Manual TBD
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Not for Exhibit
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ISRM 12.07.15.01
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Sharp EL-428 Sorokaru (Soroban-Calculator) sn482
c1981 - ¥5500
Just as there was a delay in the acceptance of electronic slide rule calculators in the western world, the Japanese were reluctant to give up their Soroban's for the calculator without double-checking their answer on their Soroban. Sharp's answer was the combination abucas/calculator. This later version was made in Korea. it uses a single AA battery with Dimensions: 298 (W) x 78 (D) x 18.5 (H) mm. 251g.
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Manual TBD
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Not for Exhibit
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ISRM 13.09.18.05
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Sharp EL-429 Sorokaru (Soroban-Calculator) sn44Y
c1984 - ¥
Just as there was a delay in the acceptance of electronic slide rule calculators in the western world, the Japanese were reluctant to give up their Soroban's for the calculator without double-checking their answer on their Soroban. Sharp's answer was the combination abucas/calculator. This later version was made in Korea.This one uses solar power. Size : W29.9(cm) x H 6.3(cm) x D1.35(cm)
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Manual TBD
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Not for Exhibit
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REF
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SUNNY_F-1660A (Soroban-Calculator)
c????
This is a Korean version of the Japanese combination Electronic Calculator and Soroban
Joern Luetjen Collection
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Manual TBD
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Not for Exhibit
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ISRM 12.04.29.01
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Soviet (Russian) Elecktronika MK33 CCCP sn887296-8904 (V2)
1983-1990 - RUB 35 (roubles/rubles)
The Eastern Europe countries in the Soviet
Bloc were hampered by the dictates of state-
run companies that had standards that were
at least 10 years behind the west. This is one
that has all the slide rule and advanced
scientific functions. It uses 3x D0.50 NiCd
button cell batteries, 19mm dia x 7mm
thick, that power an 8+1 digit red Light
Emmitting Diode (LED)Display. The rest
of the world, by now, were all using
Liquid Crystal Displays. The earlier MK-33 has 1/x functions on the firmware and 1/x functions on
the faceplate. One or two years later, another MK-33 was produced, with different
firmware incorprating the square root function with a properly marked faceplate.
The PCB's were interchangeable with both cases so it was possible that the 1/x key marked case
produced a sqrt result in some units during a repair.
New firmware also provided a few new functions: rounding after 2
digits and constant PI. You may get PI constant by pressing the memory recall button twice.
Collectors might enjoy finding both of these variants.
Variant description is based on input from Sergei Frolov of the Soviet Digital Electronics Museum in St.Petersburg, Russia.
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Manual TBD
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ISRM 13.01.27.18
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Soviet (Russian) Elecktronika MK36 CCCP sn23816
1986-1989 - RUB 70 (roubles/rubles)
The Eastern Europe countries in the Soviet
Bloc were hampered by the dictates of state-
run companies that had standards that were
at least 10 years behind the west. This is one
that has all the slide rule and advanced
scientific functions. It uses
3x D0.25 NiCd
button cell batteries, 25mm dia x 9mm thick,
that power an 8+1 digit Vacuum Fluorescent
Display. The rest of the world, by now, were
all using Liquid Crystal Displays. The case is
made of thin aluminum sheetmetal.
The MK-36 was carried into space on at
least one occasion aboard the MIR space
station by Cosmonaut Yuri Romanenko.
He used for navigational and scientific work
during his one-year flight from 1986 to 1987.
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Manual TBD
MIR Cosmonaut Yuri Romanenko, 1986
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Hewlet Packard HP20S
c1987 - $?
Donated to ISRM by Scott Reynolds, Hemet, CA
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Manual TBD
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Not for Exhibit
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Hewlet Packard HP32S
c1987 - $?
Donated to ISRM by Saleem Ahmed, Broomfield, CO
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Manual TBD
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Not for Exhibit
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Hewlet Packard HP32Sii
c1988 - $?
Donated to ISRM by Mike Konshak, Louisville, CO
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Manual TBD
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Not for Exhibit
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ISRM 18.10.24.20
|
Casio FX-250D Fraction
c1991 - $?
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Fx-82D, fx-250D Manual
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Not for Exhibit
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WANTED! - Other Potential Slide Rule Calculators
Not shown in Gallery - Donations with biographies of donors (if specimen was a personal calculator) are requested
Note: with SR- or -SR, -ESR or reference in literature to slide rules. Items added to List as discovered.
- Adler
Adler SIR SR
- Answermath
Answermath SR8
- APF Electronics Inc., New York, NY, U.S.A.
APF MARK 23 (Electronic Slide Rule Calculator)
APF MARK 30 1975 9 functions, 20 keys, and a VFD (vacuum fluorescent) display.
APF MARK 31 1976 9 functions, 27 keys, and a VFD (vacuum fluorescent) display.
APF MARK 50 (Scientific Calculator) 1975 17 functions, 19 keys, and a VFD display.
APF MARK 55 scientific calculator w/RPN logic. 1977 45 functions, 30 keys, LED display,
APF 8601 Slide Rule Calculator with LCD display
- Aristo
Aristo M 75 1975
Aristo M700, , dated 1978
Aristo Unilog S, (German)
- Boots - British Distributor of Japanese company, Casio
Boots 424 Scientific. (casio FX-21)
Boots 425 Scientific. (casio FX-31)
- Brother (Japanese company)
Brother 512SR.
Brother 522SR.
Brother 707SR.
Brother 708SR.
Brother 712SR.
Brother 715SR.
Brother 725SR, scientific, green VFD.
Brother Procal 508SR
- Canon - In 1971 Canon introduced one of the first hand-held calculators, the Canon Pocketronic, followed
by a series of models in its "Palmtronic" range.
http://www.datamath.org/Related/Canon/F-5.htm">
Canon Palmtronic F5
- Casio - Made a lot of scientific 'slide rule' calculators but only their OEM's called them that.
Casio Mini Root-8 1973
Casio Root-8 1973
Casio Root-8 1974
Casio Root-8M 1974
Casio Fx-1 May 1974 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥24,800
Casio Fx-2 May 1974 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥24,800
Casio Fx-3 May 1974 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥24,800
Casio Fx-8 May 1974 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥24,800
Casio Pocket Mini 1975 (Red LED w/sqr)
Casio Pocket Mini 1975 (VFD w/sqr,%)
Casio Pocket-Mini 801b 1975 (VFD w/sqr,%)
Casio Pocket-8 1975? (VFD w/sqr ) ¥9,500
Casio Pocket-8 Ad 1975? (VFD w/sqr ) ¥9,500
Casio personal-1 1975 (VFD w/sqr, %)
Casio personal-2 1975 (VFD w/sqr, %, +/-)
Casio AL-8 1976 First to display fractions (VFD w/sqr, pi, Sumx, Sumx^2, n, %, stats) $24.00 £16.95
Casio AL-8 New Scientist Ad 1976 First to display fractions look at bottom of page
Casio AL-8S 1976 (VFD w/sqr, pi, Sumx, Sumx^2, n, %, stats)
Casio AL-10 1975 (VFD w/sqr, pi, Sumx, Sumx^2, n, %, stats)
More on the AL10 at voidware.com
Casio AL-10S 1976 (VFD w/sqr, pi, Sumx, Sumx^2, n, %, stats)
Casio J-1 J-811 1977 (VFD w/sqr, %, +/-, MR, M-, M+)
Casio J-2 J-1011 1977 (VFD w/sqr, %, +/-, MR, M-, M+)
Casio J-3 J-1211 1977 (VFD w/sqr, %, +/-, MR, M-, M+)
Casio Fx-10 May 1974 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥24,800
Casio Fx-11 1974 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log)
Casio Fx-15 1975 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥9,800
Casio Fx-17 1975 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log)
Casio Fx-19 May, 1976 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥9,800 £19.95
Casio Fx-20 1975 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥9,800
Casio Fx-21 1975 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥9,800
Casio Fx-31 1977 Advanced version of Fx-21 with Stat functions (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥9,800
Casio Fx-29 1977 (was also labeled Fx-110) (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) £19.95
Casio Fx-39 1978 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥7,500
Casio Fx-101 1975? (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥9,800
Casio Fx-102 1976? (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥12,500
Casio Fx-110 1977 (was also labeled Fx-29) (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) £19.95
Casio Fx-120 1977 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥11,500
Casio Fx-135 1977 (Electro-Luminescence Display w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥11,500
Casio Fx-140 1978 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥8,900
Casio Fx-140 1978 (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥8,900
Casio Fx-201P 1976 Programmable (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥29,800 £59.95
Casio Fx-202P 1976 Programmable (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) £79.95
Casio Fx-360 1976? (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥29,800
Casio Fx-501P 1976? (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥49,000
More on the Fx-501P at voidware.com
Casio PRO-101 1976 Programmable (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥49,000
Casio PRO Fx-1 1976 Programmable uses Mag card (VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) £149.95
Casio PRO Fx-1 Ads at bottom of page, FX201P, FX1000 and FX-21
More on the Casio PRO Fx-1 FX201P,description - voidware.com
In late 1978 a long list of Casio's fx-series LCD's models started appearing which are not included above but shown on this product line sheet.
- Citizen (Japanese manufacturer, mostly distrubuted in Europe)
Citizen Eight (VFD w/sqrt, %,)
Citizen SR-270X 2008
Citizen 820SR
Citizen 850SR
Citizen 851SR
Citizen 852SR
831RD 4 funct, mem, %, sq funct, recip, sgn chg, green fluor
852SR, scientific, green VFD
Citizen SR I, Scientific, 2- AA rep. batt
Citizen SR II, Scientific, 2- AA rep. batt
- Colex (Hong Kong company)
ESR-70,
Commodore C110 (4F Replaced the Addiators)
Commodore SR-017, scientific, 8 digits mantissa & 2 digits exponent
Commodore SR-37, limited scientific, red LED, UK
Commodore 725SR 1975
Commodore SR-25 1976
Commodore SR7949, scientific, 5 digits mantissa & 2 digits exponent red LED
Commodore SR8120 1976
Commodore SR4190R 1977
Commodore SR912 1978
MM2SR aka Minuteman MM2SR
LC43SR, scientific, yellow LCD, button cells, slimline.
- Compex (Cal-Comp Electronics, Inc.)
manufactured by Nam Tai Electronic Company in Kowloon, Hong Kong
Compex SR-8, listed in book.
Compex SR-40, 8-digits green VFD
Compex SR-55, Scientific, green fluorescent,
Compex SR-60, Scientific, red LED, 1976
- Compuad (Australian company - Compuad Australia Sales)
Compuad SSR-2, Scientific, 8-digits mantissa & 2-digits exponent green VFD
- Czerweny
Czerweny Matematica RPN calculator
- Dietzgen
Dietzgen CD-1 Electronic Slide Rule (Desk top, made by Casio)
Dietzgen ESR-1 Electronic Slide Rule 1971 (Desk top, made by Casio)
- Elite (Euro-marketing company)
ELITE 7001 SR
ELITE 7002 SR
ELITE 7003 SR
ELITE 7004 SR
- ESR
ESR-947
- ENTERPREX
ENTERPREX SR-65 Electronic Sliderule
Enterprex SR-815 (aka Slide Rule) (possibly branded Victron SR-815)
ENTERPREX SSR-947 Electronic Sliderule
- Faber Castell
Faber Castell TR1
Faber Castell TR2
- Hanimex (Australian company with strong links to European market)
Hanimex ESR90 Electronic Slide Rule
Hanimex ESR100 Electronic Slide Rule
Hanimex ESR388 Electronic Slide Rule
Hanimex ESR80 Electronic Slide Rule
Hanimex ESR1000 Electronic Slide Rule
Hanimex ESR1010 SN Electronic Slide Rule
Hanimex ESR2170 Electronic Slide Rule
Hanimex ESR800 SN Electronic Slide Rule
Hanimex ESR Master Electronic Slide Rule
- Imperial (Imperial Typewriter Company, England, was a division of Litton Industries).
Imperial 81SR, scientific slide rule, green fluor, 3- AAA rep batt, 65x95x23mm / 2.5x3.75x0.9", Japan
- ibeco 088 slide rule calculator (rebranded Lloyds), with minimum slide rule functions. Green fluor display
- Hornet (Great Wall Electronic Co., Taiwan. Euro-market)
Hornet SR-20 Slide Rule
Hornet SR-26 Min Pocket Digitron Slide Rule
Hornet SR-30 Slide Rule
- House of Fraser UK, (ReBranded Rockwell)
House of Fraser 24HF
House of Fraser 30F
House of Fraser 44HF
House of Fraser 64HF
- Karstadt
Karstadt SR 40 Slide Rule
- KingsPoint
KingsPoint Micro Algebra (aka 8413) 1973 (sqrt, sqr, +/-)
KingsPoint SC-6010
- Kovac
Kovac 809ESR "Electronic Slide Rule"
- Litton-Monroe
Litton-Monroe 98 -1976 (sqr, sqrt, 1/x, %)
- Litronix
Litronix 2210 Slide Rule
Litronix 2235 "memory" Slide Rule
Litronix 2235B "memory" Slide Rule
Litronix 2230 "memory" Slide Rule
Litronix 2240 Scientific (Slide Rule)
Litronix 2250 Slide Rule
Litronix 2260 Slide Rule
Litronix 1603 aka slide rule
Litronix 2270 Statistical
Litronix 2290 Programmable
- Loyds
Lloyds Accumatic E322 VFD with sqrt, pi, 1/x, x2, (, ) keys.
Lloyds Acumatic 304, VFD, Sqrt Key, 1976
Lloyds Acumatic 334 Scientific, c1977
Lloyds Acumatic 999 Electronic Slide Rule, c1977
- Mach
Mach I Slide Rulette
Mach IV Slide Rulette
- Manniacs
MBO ESR-817 Slide Rule
- MBO
MANNICS MSR-40 Memory Slide Rule
MBO 121-MR Memory Slide Rule (Casio 121-MR) (VFD sqrt, %, +/-, x/y
MBO Fx-19 1976 (Casio Fx-19)(VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥9,800
MBO Fx-21 1976 (Casio Fx-21)(VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥9,800
MBO Fx-102 1976 (Casio Fx-102)(VFD w/sqr, sin, cos, tan, 1/x, a^n, e^x, log) ¥12,500
- Melcor
Melcor SR8 "ANSWERMATH", 4-function, %, memory, sq rt, red LED.
Melcor SC-600 Scientific RPN (Slide Rule) Calculator, 20 keys, 20-functions, red LED
Melcor SC-655 Senior Scientist (Slide Rule) Calculator, 12 memory, 40 keys, 50-functions, red LED. $129.00/Kit, $149.00/Assembled
- M-Office (Trade name of the Migros supermarket and department store company of Switzerland.)
M-Office 28SR, 4-function, %, square root, gree VFD, 2- AA rep. batt
M-OFFICE 33SR
- Monroe (A Litton Industries company)
Monroe 98 4-function w/sqrt, 1/x, x^2
Monroe 324 Scientist
- National Semiconductor
National Semiconductor, Model 200 - 1976 (%, sqrt, +/-)
Novus 3500 Slide Rule - 1974
Novus 4510 Mathematician Slide Rule 1975 $69.95
Novus Norman Matematica 800 (Argentena)
- Nestler (German Slide Rule Manufacturer) All examples wanted
OH1001A (Slide Rule) VFD Pi Sqrt % +/-
OH1002A (Slide Rule) VFD Sqrt % Cm RM M-= M+=
OH1005A (Slide Rule)VFD () Pi x^2 1/x % CM RM M-= M+=
T51 (Slide Rule) VFD () Pi x^2 Sqrt 1/x % CM RM M-= M+=
T69 (Slide Rule) LCD Sqrt +/- % MC MR M- M+ M<>X
Matho 220 (Slide Rule) LCD Sqrt % +/- % MRC M- M+
Matho 250 (Slide Rule) LCD +/- Sqrt % MRC M- M+
Matho 500 (Slide Rule) LCD +/- Sqrt % MRC M- M+
- Omron (Omron Tateisi Electronics Co., Japan)
Omron 10SR
Omron 86SR
Omron 12SR RPN 1976
Omron 140SR
- Prinztronics
Prinztronic Scientific Calculator, Model SC4001M (see Qualitron)
Prinztronic c-mos 8m Calculator, (sqrt, %)
Prinztronic Scientific Programmable, (Qualitron 1421 )
- Privileg
Privileg SR-35NC
- Qualitron
Qualitron Industrial Corp was a Taiwanese company owned by the Lin family. Mr Stan Shih (who later founded the Acer computer group) played a major part in establishing the company and its calculators in 1972. The company ran into financial problem in the mid-1970s.
Qualitron Scientific Calculator, Model 1444 -1977 (see Prinztronic SC4001M)
Qualitron Scientific Calculator, Model 1445 -1976
Qualitron Scientific Calculator, Model 1447 -1976
Qualitron Scientific Calculator, Model 1450 -1976
Qualitron Scientific Calculator, Model 2450 -1976
- Radio Shack Store
Radio Shack EC-375 7 functions with memory 1976 cat#65-615 sqr root, % key $39.95
Radio Shack EC-380 7 functions with memory 1976 cat#65-616 sqr root, % key, +/-
Radio Shack EC-400 7 functions with memory 1975 cat#65-630 sqr root, inv, % key $99.95
Radio Shack EC-415 "Low-cost Slide-Rule" 1976 cat#65-633 square, sqr root. inv, +/-, % key $29.95
Radio Shack EC-450 20 functions with scientific notation 1975 cat#65-631 slide rule $129.95
Radio Shack EC-475 25 functions with scientific notation 1976 cat#65-634 slide rule $59.95
Radio Shack EC-490 "Our Finest Scientific Slide-Rule" 1976 cat#65-635 slide rule $99.95 (Rockwell 63R)
Radio Shack EC-240 Statesman thin 1977 cat#65-622 sqr root. % key $29.95
Radio Shack EC-243 4 functions with sqr root and memory 1978 cat#65-618 sqr root, % key $14.95
Radio Shack EC-256 Statesman thin 1977 cat#65-625 sqr root, +/-, % key $34.95
Radio Shack EC-480 "Low-cost Slide-Rule" Digitron 1977 cat#65-637 Available Oct 30, 1976 $29.95
Radio Shack EC-495 "Low-cost Slide-Rule" 1977 cat#65-638 $39.95
Radio Shack EC-421 1978 cat#65-642 Available Sep 30, 1977 $19.95
Radio Shack EC-281 1978 cat#65-641 Available Sep 30, 1977 $29.95
Radio Shack EC-4000 1978 cat#65-560 (Texas Instruments TI-57) $79.95
- Radofin - Radofin (Triton was a registered tradename of Radofin and appears on some calculators). Radofin Electronics Ltd., London, England.
Radofin 875 Professional Slide Rule (Donated by Scott Reynolds)
Radofin SR1630
Radofin 1660 Electronic Calculator (has 'Slide Rule' in manual)
The black and white manual measures 74mm by 134mm and is 34 pages in total.
In English only, it gives plenty of definitions, descriptions and accuracies of functions, examples and problem functions.
Ref No. 1B-140-62-A
"This calculator will provide you with rapid, accurate solutions to a wide range of problems.
It is an electronic slide rule with eight digit accuracy plus the standard calculator functions
of addition, subtraction, multiplication and division. A memory stores intermediate results
for easy recall. Automatic constant retains a number for repetitive operations plus integer
powers of a number without need of a special key or switch."
Radofin 1660 - scientific functions
Radofin 2560 - scientific functions
- Rockwell
Rockwell Anita 202 Slide Rule.
Rockwell Anita 841 Slide Rule.
Rockwell 64RD Calculator
- Santron (Santronic)
SANTRON 20 SR
SANTRON 22 SR
SANTRON 300 SR
SANTRON 71 SR
SANTRON 76 SR
SANTRON 77 SR
SANTRON 8 SR 2
SANTRON 8 SR
SANTRON 81 SR
SANTRON 96 SR
SANTRONIC 300 SR
- Sanyo
Sanyo CZ-8102 Mini Electronic Slide Rule (on Instruction Manual)
Sanyo Sanyo CZ 2901
- Sears
SEARS BASIC SLIDE RULE
SEARS DIGI-MATIC SR-8 (41016).
SEARS ELECTRONIC SLIDE RULE (801.58770)..
SEARS ELECTRONIC SLIDE RULE II (801.58780).
- Sieko
SEIKO 6138-7000 (Rechenschieber) Watch
- SERD
SERD ESR-817
SERD Stuttgart
- Silver-Reed (Silver Seiko International)
SILVER-REED SR 104
SILVER-REED SR 104 2
SILVER-REED SR 80
SILVER-REED SR 81
SILVER-REED SR 82 Version 1 1975 VFD (Slide Rule)
SILVER-REED SR 82S (Slide Rule) 1976
SILVER-REED SR 82 Slide Rule, VFD 1976
SILVER-REED SR 84
SILVER-REED SR 84 2
SILVER-REED SR 85
SILVER-REED SR 104 Slide Rule with all trig functions and exponents
- Sharp
Sharp Retro Commercial
Sharp EL-8 Sharp's 1st pocket calculator with individual VFD tubes
Sharp ELSI MATE EL-8100S (VFD w/SQR, %, memory)
Sharp ELSI MATE EL-8117 (VFD w/SQR, 1/X, %, A^x, +/-)
Sharp ELSI MATE EL-105 (VFD basic SR)
Sharp ELSI MATE EL-204 (LED basic SR w/SQR, %, +/-, CM, RM, M+, M-)
Sharp PC-1801 (LED slide rule, log and trig functions w/memory)
Sharp EL-8102 (VFD %, sqrt, 1 memory)
Sharp EL-8103 (VFD slide rule, log and trig functions w/memory)
Sharp ELSI MATE EL-8104 (VFD slide rule, log and trig functions w/memory)
Sharp ELSI MATE EL-8113S (VFD slide rule, log and trig functions w/memory)
Sharp ELSI MATE EL-8115 (VFD slide rule, log and trig functions w/memory)
Sharp ELSI MATE EL-8200 (VFD busines slide rule)
Sharp ELSI MATE EL-5001 Pythagoras (VFD slide rule, log and trig functions w/memory)
Sharp ELSI MATE EL-5002 Pythagoras (VFD slide rule, log and trig functions w/memory)
Sharp ELSI MATE EL-501 1977 (VFD slide rule, log and trig functions w/memory)
Sharp PC-1201, "Pocket Computer" 1977 (VFD slide rule, log and trig functions w/memory)
- Sperry-Remington (Casio)
Sperry-Remington SSR-8 Scientific Slide Rule Calculator.(same as Casio FX-10)
Sperry-Remington SSR-9 Scientific Slide Rule Calculator.(same as Casio FX-15)
Sperry-Remington SSR-12 Scientific Slide Rule Calculator.(same as Casio FX-101)
Sperry-Remington SSR-14 Scientific Slide Rule Calculator.(same as Casio FX-17)
Sperry-Remington SSR-15 Scientific Slide Rule Calculator. (same as Casio FX-102)
Sperry-Remington SSR-21 Scientific Slide Rule Calculator. (same as Casio FX-29)
Sperry-Remington SSR-25 Scientific Slide Rule Calculator. (same as Casio FX-102)
Sperry-Remington SSR-839M Slide Rule Calculator with Root. (same as Casio Memory 8A)
Sperry-Remington 809SR Desk top Slide Rule Calculator. (same as Casio Memory 8A)
Sperry-Remington 809SR (exploded chart) Desk top Slide Rule Calculator. (same as Casio Memory 8A)
- Technico (see also Olympia, Santron/Santronics)
Technico 55 SR
Technico 77 SR
- Texas Instruments
TI SR-40-LCD
TI-25 LCD (pre- solar)
TI-35 LCD (pre- solar)
TI-50 LCD (pre- solar)
SR-56 (working)
- Triumph
Triumph LS826
- Unisonic
- Unitrex of Canada
Unitrex Executron S874L Slide Rule Calculator
Unitrex Executron 817D is a scientific calculator with algebraic logic. It has a VFD (vacuum fluorescent) display. The power source is 2xAA.
Unitrex UC-75 Scientific Slide Rule Calculator
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HOF 64HF
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