The museum is always looking for interesting or unusual old calculators, late model mechanical or early electronic. If you have a calculator which you feel may fit the museum's interests, and want to find a new home for it, please contact us. Also, the museum has a few items for trade (listed at the end of this page) that you may be interested in checking out. If you have a something that would make a good addition to the museum, whether listed here or not, please send an EMail.
The museum is primarily interested in desktop electronic calculators from the beginning
(early 1960's) through the mid-70's. We
generally do not collect handheld calculators with LED or Liquid Crystal
displays. The primary interests lie in desktop electronic machines utilizing
early display technology such as CRT, Nixie Tube, Burroughs Panaplex, incandescent displays, Numitron, Itron, early desktop (not handheld) LED
(Light-Emitting Diode), and early discrete tube
vacuum-fluorescent devices. Electronic designs include discrete
diode/transistor, parametron (ferro-electronic logic), cold-cathode tubes,
early bipolar (DTL & TTL) and MOS integrated circuit techology in small and
medium-scale forms, along with early Large-Scale MOS integrated circuit
devices. Manufacturers include (but not limited to):
Sumlock Comptometer (Anita),
Industria Macchine Elettroniche (IME),
SCM (Smith-Corona Marchant),
or Wyle Labs. Secondarily, the museum has interest in later-model (1950 and beyond) electro-mechanical (motor-driven) calculators from
Monroe, SCM/Marchant, Friden, Facit, Soemtron,
or Diehl, built between the mid '50's through late '60's. Must be calculators
(e.g., can add, subtract, multiply and divide automatically), generally rotary type.
Secondarily, the museum has interest in later-model (1950 and beyond) electro-mechanical (motor-driven) calculators from Monroe, SCM/Marchant, Friden, Facit, Soemtron, or Diehl, built between the mid '50's through late '60's. Must be calculators (e.g., can add, subtract, multiply and divide automatically), generally rotary type.
The museum generally prefers machines that are in operating and presentable cosmetic condition, but if you have a broken calculator that is listed on this wanted list or seems to meet the general criteria, don't hesitate to contact the museum. If you have something that seems to fit the interests of the museum, but would rather trade, please see the Trade section at the end of this page. Of course, if your old machine is laying around gathering dust, and you'd love to see it exhibited in the museum, donations are gratefully accepted. The museum does not yet have non-profit organization status, so a tax deduction for your donation cannot be granted, but the website and physical exhibit will most certainly credit you for your contribution. The museum can arrange to pay packing and shipping costs for calculators that donated.
The museum also has guest exhibits, which are exhibits provided on loan from the owner of the machine. The museum can arrange to pay packing, shipping and insurance costs to get your calculator to the museum for documentation as an exhibit, and then pay shipping and insurance costs to return the calculator to you. Guest exhibits are credited to the owner of the machine. A guest exhibit is a great way for your old relic to be documented for others to see and learn from. Please visit the Old Calculator Web Museum FAQ for more information on guest exhibits.
Here's a list of calculators that the museum has particular interest in. If the make/model of the calculator is a link, you can click on it to see a picture and perhaps other information about the machine. Just because you may have a machine which isn't on this list doesn't mean you shouldn't contact the museum. If a calculator you have meets the general criteria above, please don't hesitate to get in touch. If you have one of the calculators on the list, all the better.
Of course, should you have any questions about any of the machines exhibited in the museum, or listed here in the Wanted area, please don't hesitate to send an EMail.
Looking for any information or examples of Wyle Laboratories' Model WS-01 "Scientific" calculator.
Wanted - Any information on, or examples of a calculator called the Aleph Zero, made by Oi Electric, a Japanese electronic equipment manufacturer.
Wanted - Any information on, or examples of a calculator called the Sage-1, made by Dero Research and Development Co.
Early printing electronic calculator made by A.B. Addo of Malmo, Sweden. 18 digit capacity (with four additional guard digits), 10-key keyboard.
14-digit capacity, fixed decimal at 0, 2, 4 and 6 digits behind the decimal point. Constant for multipliation and division.
Anita Mark 11
Interesting hybrid calculator utilizing both transistor and cold-cathode (thyratron/dekatron) circuitry. First Sumlock Anita calculator to utilize 10-key keyboard versus the "full" keyboards of earlier machines.
Anita Mark 12
Interesting hybrid calculator utilizing both transistor and cold-cathode (thyratron/dekatron) circuitry. Functionally similar to Mark 11, with 10-key keyboard, but adds a memory register.
Third Generation Sumlock/Anita Nixie tube calculator. Ten digit, four function with percent and memory. Mostly discrete transistor circuitry with a few IC's.
Anita 1011 LSI
3rd Generation Sumlock/Anita Nixie tube calculator. Ten digit, four function with percent and memory. Essentially a re-implementation of Anita 1011 (see above) using early Large Scale IC's.
Follow-on machine to Nippon Calculating Machine Co.'s first electronic calculator, the Busicom 161. The 141 was a cost-reduced version of the 161. 14-digit capacity, Nixie display four-function calculator with single memory register. Discrete diode/transistor logic. Thumbwheel- selectable fixed decimal point location.
16-digit capacity, Nixie tube display, automatic square root, two accumulating memory registers. Utilizes small-scale DTL IC logic, with a small core memory array for working register storage. Marketed in the US by NCR as the NCR 18-3.
A programmable desktop calculator sold by Nippon Computing Machine Co. (NCM), but designed under contract by Wyle Laboratories. Uses built-in punched card reader for program entry. 20 digit capacity, with CRT display. Two memory registers. Utilizes early small-scale DTL integrated circuit technology, and magnetostrictive delay line for register storage.
A programmable desktop calculator marketed by Busicom, but designed by Wyle Laboratories. Follow-on to the NCM/Busicom 202. Uses built-in punched card reader for program entry. 20 digit capacity, with CRT display. Seven memory registers. Utilizes early small-scale integrated circuit technology. The Model 207P provided a connection for an external printer.
Busicom's advanced programmable desktop calculator. Also designed by Wyle Laboratories for exclusive marketing by Busicom. Uses built-in punched card reader for programming. 20 digit capacity, with CRT display. 17 memory registers. Utilizes early small-scale DTL integrated circuit technology. Also available as the Model 2017P, with an external high-speed printer.
Fourteen digit four-function printing electronic calculator. Same functionality as the Brother 514. Utilizes early Mitsubishi-made small-scale integrated circuit technology.
Burroughs 12-digit Nixie display Desktop Calculator, circa late 1960's. One accumulator-style memory register. Four function only.
Burroughs 16-digit Nixie display Desktop Calculator, Circa 1968-1970. Two accumulator-style memory registers. Four function with square root.
Burroughs C3661 Desktop Programmable
Burroughs 16-digit Nixie display Desktop Programmable Calculator, Circa 1971-1973. Follow-on to the Burroughs C-3660 calculator, with additional of steps of program memory, and more comprehensive test/branch capabilities. Mag-Card reader for program storage. Early Large-Scale integrated circuit calculating engine. Wanted in any condition, working or not.
Burroughs Programmable Desktop Printing calculator, circa 1977-1979. Higher-level programming functions. Four function math, with arbitrary root and power functions. Algebraic logic.
First Canon electronic calculator product, introduced in late 1964. All transistor circuitry. Four function, 13 digit capacity. Display uses unique electro-optical technology designed by Canon. See exhibit of Canon 161 for more information.
Canon Nixie-display desktop electronic calculator from the late 1960's. 16 digit with memory functions, square root. The Monroe 990 may be the Monroe-sold version of this calculator.
An interesting calculator designed using a small magnetic drum as the storage element for the working registers of the calculator. 16 digit capacity with four functions and square root. Utilizes Canon's unique electro-optical display technology, same as used in the Canon 161. Seven memory registers (five store/recall, two accumulating registers).
Canon Punched-Card Programmable, 16-digit Nixie Display. Appears to be virtually identical to Canon 167P, with more memory registers (14), and possibly larger program storage space.
Canon Canola SX-320 Programmable
Complex programmable calculator, from the 1977 timeframe. LED display, 16-digit mantissa, 2-digit exponent, with signs. Mostly LSI IC technology, with a lot of small-scale glue logic. Built-in thermal alphanumeric dot-matrix printer, and magnetic tape cassette drive. Fixed or floating decimal. Large compliment of scientific functions built-in.
Casio 001 Desktop Calculator
Casio's first solid-state electronic calculator. Nixie tubr display, four-function, AC-powered desktop calculator. Constant set by front-mounted rotary switches.
Casio 101P Desktop Calculator
Printing version of the Casio 101 calculator. Four-function, AC-powered printing desktop calculator. Single memory register can automatically accumulate sum of products or quotients. Seven-digit constant set by rotary switches. 20 character-per-second printer records results on adding machine tape. Casio's first printing electronic calculator.
Casio 152 Desktop Calculator
15-digit Nixie-display desktop electronic calculator, utilizing early small- and medium-scale MOS integrated circuit logic. Four function with two memory registers and summation modes.
Casio 161 Desktop Calculator
Second-generation Casio Desktop Nixie-Tube Calculator. 16-Digit, four-function calculator with one accumulating memory register Top end machine in Casio's first line of electronic calculators to use MOS integrated circuit logic.
Casio 121-B or AS-B Desktop Calculator
Casio Desktop Nixie-Tube Calculator. Identical machines with two different model numbers...photo shows 121-B, but AS-B is identical with exception of model number. Looking for either or both machines. 12-Digit, four-function with accumulating memory register. AC-Powered. Sold by Sperry Remington in the U.S. as the EDC-1201GT "Lektronic".
Casio 121-K Desktop Calculator
Casio Desktop Nixie-Tube display Calculator. 12-Digit, four-function with constant and accumulating total register. Circa late 1970, uses early Fairchild 4-chip LSI calculator chipset. AC-Powered.
Casio 122 Desktop Calculator
Casio Desktop calculator. Nixie-Tube Display. 12-Digit Nixie- display four-function AC-powered desktop calculator.
Casio 152 Desktop Calculator
Second-generation Casio Desktop calculator. 15-digit Nixie-Tube Display. Four-function with two memory registers. Fixed and floating decimal point modes.
Casio 161 Desktop Calculator
Second-generation Casio Desktop Nixie-Tube Calculator. 16-Digit, four-function calculator with one accumulating memory register Top end machine in Casio's first line of electronic calculators to use MOS integrated circuit logic.
Casio AL-1000 Desktop Calculator
First-generation, transistorized electronic calculator from Casio. Casio's first programmable calculator. Identical machine marketed by Commodore as the Commodore AL-1000. Not looking for the Commodore-branded unit. Wanted dead or alive.
Casio AL-1000S Desktop Calculator
Updated version of the AL-1000 (see above) that provides input/output capabilities via an external typewriter).
Casio AS-C Desktop Calculator
Casio Desktop 12-digit Nixie-Tube Calculator from early 1970's. Early 4-chip LSI chipset made by Fairchild. Electronically simiar to the Casio 121K. May also have been marketed as Casio 121-C, but as yet this has not been positively verified.
Casio CL-100 Desktop Calculator
Small-scale IC-based four-function entry-level desktop electronic calculator. 12-digit Nixie display, floating decimal.
Cintra/Tektronix "Statistician" Model 911 Desktop Calculator
10 digit (plus 2 digit exponent) Nixie display, statistical functions calculator. Probably introduced in late '69 to early '70. Originally made by Cintra, but later rebadged by Tektronix, when Tek purchased Cintra in May of 1971. Physical appearance virtually identical to the Cintra/Tektronix 909 with only difference being keyboard nomenclature.
Commodore worked out a deal with Omron in Japan to OEM the guts of this calculator, which they packaged and sold as the Commodore C-108. Omron had contracted with chip design house and fabricator Nortec Electronics to develop a low-cost three-chip LSI chipset that set a new benchmark for a low-cost four-function desktop calculator. Omron sold their version of the calculator as the Omron 800. Commodore aggressively priced and marketed the machine in North America, and made a killing on it, devestating the market by flooding it with these low-cost machines. This calculator started a price war on basic desktop calculators that resulted in a huge shakeout in the calculator marketplace. Basic four-function with automatic decimal placement. Eight-digit vacuum-fluorescent display. See the Miida MC-840 and Adler 804 exhibits for examples of calculators using the same internals, which were sourced by Omron.
Commodore 12-digit desktop electronic calculator. Nixie tube display. Accumulating memory register for sum of products/quotients. Automatic constant for multiply/divide. Hybrid fixed/floating decimal, with location set by position of decimal in first number. Small and Early Medium-Scale MOS Integrated Circuitry.
Commodore 8-digit desktop electronic calculator. Vacuum-fluorescent display, with individual tubes. Four function with memory register and constant. Floating decimal.
Compucorp 110 Scientist
Compucorp AC-Powered Desktop Scientific Calculator. Shared styling with other first generation Compucorp calculators. Nixie tube display, scientific notation capable.
Compucorp 110G Scientist
Compucorp AC-Powered Desktop Scientific Calculator. Enhanced version of Compucorp 110 to provide trig arguments and results in degrees or gradians selectable by a front panel switch.
Compucorp 155 Surveyor
Compucorp AC-Powered programmable printing desktop calculator specifically designed for surveying applications. First-generation HTL Large Scale chipset shared with other 100-series calculators. Drum impact printer. Optional card reader for loading programs from punched cards.
Compucorp 327 "Scientific"
Compucorp 360 Bond Trader
"Portable" Compucorp Bond Trading (Financial) Calculator. Panaplex display, can operate on battery (rechargeable NiCd) or external charger. Learn-mode programmable.
Data Acquisition Corp. DAC-512
An early advanced programmable desktop calculator made by Data Acquisition Corp., of Hamden Connecticut. Machine was introduced in mid-1965, and was arguably the most powerful desktop electronic calculator available at the time, and for some time thereafter. Four-function, arithmetic logic with parentheses. Nixie display. Keyboard/display unit with cable to remote electronics package. Transistor and magnetic core memory technology. Wanted dead or alive. Also looking for documentation, marketing literature, or user anecdotes.
Eugene Deitzgen Co. OEM version of Computer Design Corporation's Desktop Nixie-Tube display scientific programmable calculator. Calculator provides Trigonometric Functions, Factorial, Square Root, Logarithms, Exponential functions. 128-Step Program Memory.
2nd Generation Denon Desktop Electronic Calculator. 12-digit Nixie display, four function, fixed decimal, with constant function.
Early Denon Desktop Calculator. 12-digit Nixie display.
Early Denon Desktop Calculator. 14-digit Nixie display.
Dero Sage 1
One and only calculator made by Dero Research & Development Corp., a company that manufactured military radio equipment. The machine has a ten-digit 7-segment display and a double-precision mode to provide a capacity of 20 digits. It is a basic four-function calculator, with a single memory register. Strangely, the machine provides no capability for calculations involving fractional numbers. It was introduced in October of 1965, and was unusual for the time in that it utilized early small-scale integrated circuit technology from semiconductor manufacturer Signetics. If you have one of these machines, worked for Dero Research during this time, or have any information about this machine, please contact the curator by clicking the EMail link above.
First electronic calculator by German firm Diehl, introduced in 1966. Design by Stanley Frankel, American Manhattan Project Nuclear Phycisist and later, prolific Computer/Calculator Designer. Print-only calculator, with front panel indicators to show how many digits have been entered. All-transistor logic, with two magnetostrictive delay lines (one for microcode store, the other for program step, memory registers, and working register storage. Metal punched tape loads at power-on with "operating instructions" (microcode). Learn-mode programmable, four function calculators with automatic one-key square root.
14-digit Nixie desktop calculator, 4 function, fixed decimal. Small-scale IC logic.
16-digit Nixie desktop calculator, 4 function, fixed decimal with 2 accumulating memory registers. Small-scale IC logic.
Friden 5005 Computyper
Late '60's-vintage business "billing" machine integrating functions of a programmable calculator into a 2nd generation Friden Flexowriter. Any information, documentation, stories/recollections, and, of course, if you have one, the museum wants it, working or not.
Friden's first electronic printing calculator. Base model in series, similar to to Friden 1152 calculator. Small-scale integrated circuit technology.
A programmable version of the 1150 (see above), providing learn-mode programming capability of 30 steps. Small-scale integrated circuit technology.
Friden desktop electro-mechanical calculator with automatic Square Root.
Friden Electro-mechanical, early 1960's. Shortcut multiply, automatic decimal point placement.
General Teknika 1600
Manufactured by The General Corporation of Japan, the Teknika 1600 is a large desktop electronic calculator from the early 1970's. The machine provides sixteen digits of capacity, with fixed decimal point settings ranging from zero to nine digits behind the decimal. The machine uses gas-discharge seven-segment display tubes. The circuitry is implemented with Mitsubishi small-scale DTL/TTL integrated circuits, and a small core memory array for working register storage.
Hitachi's lower-cost, higher level integration version of the Hitachi ELCA-26. Nixie tube display. 14-digit capacity. Four function with two memory registers. Marketed by Hitachi in Asia and Europe.
Hitachi's lower-cost, higher level of integration version of the Hitachi ELKA-42. Nixie tube display. 12-digit capacity. Four function with one memory register. Marketed by Hitachi in Asia and Europe.
Follow-on, lower-cost version of the original IME 84 and IME 86 calculators. All transistor circuitry of same architecture as the earlier machines. 12 digit capacity with fixed decimal. Nixie tube display, four function with single accumulating memory register.
First electronic calculator by Italian calculator company Industria Macchine Elettroniche (IME). One of the earliest all-transistor calculators. Uses core memory for register storage. 16-digit capacity with Nixie tube display. Four function. Introduced in 1964.
Programmable desktop electronic calculator designed for in-house engineering use by Logicon, Inc. of Redondo Beach, California. CRT Display. Learn-mode programming. Core memory for register and program storage. First prototype operational early to mid-1965. Machine never became a product -- it was designed and manufactured (somewhere between two and six were apparently made) strictly as a tool to help with engineering calculations within Logicon.
MITS general-purpose desktop calculator. 14 digit LED display. Square root, percent, and memory functions. Circa 1973.
MITS most advanced calculator targeted at scientific/engineering usage. Stack-based architecture, with 3, 5, or 7-level stack. Two store/ recall memory registers. Ten digit LED display with fourteen digit accuracy. Normal or scientific (-99 to +99 exponent) numeric representation. Introduced December, 1972.
MITS 7440 Programmer
Before the Altair, widely recognized as the first practical "personal computer", MITS (among other things, such as an infrared communicator and various telemetry systems for model rockets) marketed electronic calculators that were avialable in assembled or kit form. The museum is looking for the "7440 Programmer", an add-on device that when connected to the 7440 calculator, would allow 128 or 256 (depending on memory option) step programs that included looping and branching capabilities.
Monroe EPIC 2000 Programmable Calculator
Printing only, all transistor "Learn Mode" programmable calculator. Two part design, printer/keyboard unit connects to suitcase-sized electronics package. Specifically looking for keyboard/printer unit, but any and all parts wanted.
Monroe 820/820A [UPDATED]
14 pound desktop CRT display four-function office calculator. Fixed and floating decimal settings. Two row, 14-digit CRT display, with seven-segment digit rendition. Circa 1969/1970. Two versions, 820, and 820A which added an accumulation mode with a switch on the keyboard for enabling accumulation.
Monroe 1710 Statistical Calculator
Desktop Nixie-tube display scientific calculator, circa 1971-1972. Made by Computer Design Corp. for Monroe, similar (if not identical) to the Compucorp 110 Scientist from Computer Design Corp.
Monroe 1765 Surveyor
Desktop Printing-only Programmable Calculator, with specialized functions for surveying applications. 256-step program storage. Can connect to external punched card reader for loading programs. Circa 1971.
Entry-level machine in Monroe's 600-Series of desktop electornic calculators. Utilizes early Large-Scale Integration Chipset (4 chips) made by Texas Instruments.
Manufactured by NCM/Busicom(Japan) and sold by NCR through an OEM license with NCM. 14-digit Panaplex-style gas-discharge display. Utilizes small-scale integrated circuit technology, and small magnetic core memory for register storage. Four function, with single accumulating memory register. Fixed decimal. Introduced slightly later than NCR's first machines marketed through their OEM relationship with NCM/Busicom, the NCR 18-2, and the NCR 18-3.
Manufactured for NCR for sale in USA by NCM/Busicom(Japan), who marketed the identical machine as the Busicom 162C. 16-Digit Nixie display calculator, utilizing small-scale integrated circuit technology, and small magnetic core memory for register storage. Four function with one key automatic square root. See exhibit on the NCR 18-2 for information on the 18-3's little brother, same calculator without square root function.
Manufactured for NCR for sale in USA by NCM/Busicom(Japan). Medium-Scale integrated circuit logic implementation. 12-digit Vacuum-Fluorescent display, four function, fixed decimal.
Manufactured for NCR for sale in USA by NCM/Busicom(Japan). Uses first single-chip calculator IC made by Mostek. 12-digit Vacuum-Fluorescent display, four function, fixed decimal.
Oi Electric Aleph-Zero
Early desktop electronic calculator utilizing Parametron ferromagnetic devices as logic elements. Only calculator made by Oi Electric in Japan.
Olivetti Programma 101
The museum's existing Programma 101 has some problems that are difficult to solve (rubber parts disintegrating, some missing parts). Looking for complete machines or parts, working or not, to try to put together a fully operational example for the museum.
Circa 1971. Follow-on to Olivetti Programma 101. Mag-card reader/writer for offline program storage. Built-in drum printer for output.
Olympia RAE 4/15
Olympia's first electronic calculator. All-transistor construction with magnetic core memory, Nixie tube display. Four function with multiple memory registers. 15-digit capacity.
Olympia RAE 4/30-2
First generation Olympia electronic calculator. Mid-range machine the RAE 4/30 series, with two memory registers. Magnetic core memory, Nixie tube display, all-transistor construction.
Olympia RAE 4/30-3
First generation Olympia electronic calculator. High end of the RAE 4/30 series, with three memory registers. Functionally identical to the Monroe 770, which was a cosmetically modified version of the RAE 4/30-3 (keyboard color changes, badging, power switch location, and overflow/sign indicator indication) marketed in North America by Monroe.
12-digit Nixie display (with double precision 24-digit capacity) four function desktop calculator with single memory register. Circa 1970.
Omron's first electronic calculator. Very early four-chip LSI calculaor chipset. Desktop, 12-digit calculator with add/subtract memory register. Unique segmented vacuum-fluorescent display that creates stylish digits that look almost handwritten. Very early MOS LSI chipset technology (4 chips). Sold under other brands, through contracts with Omron. The museum is interested in any brand of this calculator.
Omron's second electronic calculator. Desktop, 12-digit four-function electronic calculator. Logic reduced to two-chip chipset versus four in Omron 1210. Unique segmented vacuum-fluorescent display that creates stylish digits that look almost handwritten. Very early MOS LSI chipset technology (2 chips). Sold under other brands, through contracts with Omron. The museum is interested in any brand of this calculator.
Omron contracted with chip design house IST and fabricator Nortec Electronics to develop an inexpensive three-chip LSI chipset that set a new benchmark for a low-cost four-function desktop calculator. Basic four-function with automatic decimal placement. Eight-digit vacuum-fluorescent display. See the Miida MC-840 and Adler 804 exhibits for examples of calculators using the same basic insides, which were made by Omron and sold to other calculator makers.
Twelve digit, four function, vacuum-fluorescent display calculator pacakged in a very contemporary wedge-shaped cabinet. Offers a single accumulating memory register which can be added to or subtracted from. Unusually small package for a full 12-digit calculator, hinting that the machine uses some form of large-scale integrated circuit technology for its brains. Same cabinet package used on the Miida MC-840.
First-generation printing-only desktop electronic calculator by Philips, 1968. Discrete component transistorized logic utilizing magnetic core memory as working storage. Drum and hammer printing mechanism. Four function with percent feature. Two memory registers. 16 digit capacity with fixed decimal, leading zero suppression.
Second-generation printing desktop electronic calculators from Philips, circa 1969. Early small-scale DTL integrated circuit design, utilizing magnetic core memory as working storage. 90 character-per-second serial 7-pin dot-matrix printing mechanism, first of its kind in electronic calculator use. 14-digit capacity. Model P 249 has no memory capability, while the P 251 and P 252 have one and two memory registers respectively. All models feature a percentage calculation. Model P 252 includes one-key automatic square root. All models have fixed decimal with trailing zero suppression and automatic rounding. Approximate dimensions of 19" deep, 13 3/4" wide, 8 1/4" high and weight of 33 pounds.
Ricoh Ricomac 1200D
Basic early '70's four function, 12-digit desktop calculator. Manufactured by Unicom (a division of chip manufacturer AMI), and sold through OEM customers including Ricoh and Commodore, as well as under the Unicom brand name. Unicom's first calculator product.
Ricoh Ricomac 1200
An updated version of the Ricomac 1200D using newer AMI LSI technology to shrink the size of the machine, by reducing the chip count. Manufactured by Unicom division of AMI, and sold through OEM customers including Ricoh and Commodore, as well as under the Unicom brand name.
Ricoh Ricomac 2420
Twelve digit, four function, Nixie display desktop office calculator with memory register. Small scale integrated circuit logic, withr magnetostrictive delay line for register storage.
Microprocessor-based desktop programmable electronic calculator made in East Germany by VEB Robotron-Büromaschinenwerk. Seven-segment LED display with ten digits for display, and an additional two digits with sign for power-of-ten exponent, along with four-digits for displaying program step number. Based on an Eastern-European clone of the Intel 8008 microprocessor called the U808. Thermal printer for recording results of calculations and listing programs. Magnetic card for storing/reading programs and data. ROM-based plug-in cartridges for adding functions such as statistics and scientific calculations. Lesser-capable versions marketed as K1001 and K1002, which are also of interest. Introduced in 1978.
Any Rockwell 900-Series Programmable Calculator
Mid-1970's vintage programmable electronic calculators from Rockwell. Models include 920, 930, 940, and 960. Display and printer. Magnetic card reader for program/data storage. 14-digit capacity using Panaplex-stype gas-discharge display.
Late 1960's small-scale MOS Integrated Circuit-based four-function desktop electronic calculator. Unique modular seven-segment incandescent display. 12-digit capacity, sliding fixed decimal selection with 0 to 6 digits behind decimal.
Small scale MOS-IC-based desktop electronic calculator from the late 1960's. Unique modular segmented incandescent display. 14-digit capacity, fixed decimal, four function single accumulating memory register. Utilizes early MOS shift register IC for register storage.
First LSI-based calculator from Sanyo. 16-digit capacity, gas-discharge tube-type display. Four function. Probably the smallest 16-digit electronic calculator ever made.
Late 1960's small-scale MOS Integrated Circuit-based desktop electronic calculator. Modular seven-segment incandescent display. 16-digit capacity, sliding fixed decimal selector 0-15 digits behind decimal, four function with single-key square root. Two accumulating memory registers.
SCM/Marchant Cogito 240
First electronic calculator from SCM/Marchant, introduced in June, 1965. CRT display, four function calculator with three surrogate memory registers. Transistorized logic with magnetostrictive delay line for register storage.
SCM/Marchant Cogito 566PR
1968 vintage programmable printing electronic calculator. Four function with automatic square root. 16-digit capacity, eight memory registers. 66 step learn-mode programmability.
SCM/Marchant Model 410
Low-end model of SCM/Marchant 400-series desktop electronic calculator. Nixie tube display, 10 digits. Unique 'dimmed' leading/trailing zeroes. Floating point (as opposed to settable fixed point on Cogito 412(12-digit) and Cogito 414(14-digit) models. Does not provide division function! Note that this model is designated "Marchant 410" as opposed to the "Cogito" designation on the 412 and 414 machines.
Sharp Compet 10 (Model CS-10A)
Sharp's First All-Transistor Electronic Calculator. "Full Size" keyboard, similar to older style electromechanical calculator. Nixie tube display.
Sharp Compet 17
A lower-cost version of the Sharp Compet 16 omitting the memory functionality. The machine utilizes identical circuitry to the Compet 16, just omits the keys on the keyboard for the memory functionality. Priced $100 less than the Compet 16.
Sharp Compet 18
MOS-IC-based desktop calculator utilizing unusual Itron Vacuum-Flourescent display tubes. Identical in function to the Sharp Compet 16 with only difference being the Itron vacuum-fluorescent display versus the Nixie tube display of the Compet 16.
All-transistor electronic desktop. 14 plus sign Nixie display.
Sharp Compet 21
Sharp Compet 23
Reduced cost version of the Sharp Compet 22, removing accessory connection capability. Four function, one accumulator-style memory register, 14-digit Nixie display.
Sharp Compet 30
Similar in appearance and architecture to the Sharp Compet 20, but utilzed fixed decimal point logic, and added a memory register for ease in processing multi-step calculations. Two versions were manufactured, the CS-30A, and CS-30B. The CS-30A had no numeric sign indication and could not properly display negative numbers, while the CS-30B added + and - indicators and could properly deal with negative numbers. Some examples of the CS-30B have been found with integrated circuits, creating confusion with regard to the Sharp Compet 31 (see below) as being the first Sharp calculator to use ICs.
Sharp Compet 31
14-digit Nixie display, with single memory register, visually and functionally identical to the Sharp Compet 30 model CS-30B. This machine was essentially a remake of the CS-30B utilizing early small-scale bipolar integrated circuit technology. A small number of IC's, combined with conventional discrete diode/transistor logic make up the machine. Introduced in early 1967.
Sharp Compet 32
Follow-on machine to the Sharp Compet 31 adding an additional memory register and automatic square root operation. Sharp's first electronic calculator to use magnetic core memory and multiplexed display technology. Limited number of small-scale Mitsubishi-made bipolar integrated circuit logic combined with a large amount of discrete diode/transistor logic. Wanted dead or alive.
Sharp Compet 261
16-Digit Nixie display desktop.
Sharp Compet 361 / 361R
Sharp Desktop electronic calculator, introduced in early '69. 16-digit Nixie tube display. Small-scale MOS IC design, with small magnetic core memory array for working register storage. Four function (model 361R adds two-key square root function), fixed decimal, with two accumulating memory registers.
Sharp Compet 364P
Sharp Desktop Programmable. 16-digit Nixie tube display, magnetic card reader for program load/store. Appears to pre-date the 363P, using earlier technology. Optional 'snap-on' printer module adds printing capability.
Sharp Compet 662
Printing desktop calculator utilizing "ticker-tape" style serial printer, circa 1969.
Sony Desktop Electronic Calculator. 16 digit, 2 memories, square root.
First-generation Sony Desktop Calculator. Upgraded version of Sony ICC-500W, adding 'comma' digit grouping, memory subtotal, and constant functions. Hybridized transistor circuitry. 14 digit capacity, Nixie tube display with lead-zero suppression.
First-generation Sony Desktop Calculator. Upgraded version of Sony ICC-550W, adding square root function. Hybridized transistor circuitry. 14 digit capacity, Nixie tube display.
Sony's top-of-the-line programmable calculator, and also last of Sony's line of electronic calculators before they left the calculator business. Very similar to Sony ICC-2550W in the museum, except adds additional memory registers (12) and larger program storage space (253 steps).
Sperry Remington EDC-I / EDC-ID
Sperry-Remington Nixie desktop, late 1960's. 13 digit with fixed decimal. Small-scale IC circuitry, with IC's made by Philco. EDC-1D offers thumbwheel-selectable decimal point, while EDC-1 provides no obvious means for setting decimal point selection.
Tektronix Model 21
Tektronix' entry-level programmable, little brother to the Tektronix Model 31. Introduced in mid-1973. Scientific math functions, including trig, logarithms, power functions, square root, along with some statistical functions. Panaplex-style seven-segment display using Sperry display modules. Optional thermal printer. Magnetic strip program storage. Single linear "f(x)" learn-mode program with no loop/branch capabilities.
Toshiba TOSCAL BC-1201
Early Toshiba entry-level low-cost desktop four-function electronic calculator. 12-digit capacity, Nixie tube display. Discrete diode/transistor logic. Fixed decimal at 0 or 3 digits behind decimal point. Constant function. No memory.
Toshiba TOSCAL BC-1202
Toshiba entry-level low-cost desktop four-function electronic calculator. 12-digit capacity, Nixie tube display. Small-scale integrated circuit logic.
Toshiba TOSCAL BC-1211
12-digit, four-function desktop electronic calculator. Identical in style to the Toshiba BC-1211S.
Toshiba TOSCAL BC-1213
Second-generation Nixie Tube display desktop electronic calculator. 12-digits.
Toshiba TOSCAL BC-1412
Early (late 1960's) Toshiba Nixie Tube electronic calculator. 14-digit, five function (percent function) calculator with memory. Fixed decimal, thumbwheel selectable to 0, 2, 4, 6, or 8 digits behind the decimal point. All-transistor circuitry.
Toshiba TOSCAL BC-1414
Early (late 1960's) Toshiba Fluorescent display electronic calculator. 14-digit display w/memory. Fixed decimal w/ rotary-switch selectable decimal point location. "Large-Scale" MOS integrated circuit design, circa 1970.
Toshiba TOSCAL BC-1421
Early (late 1960's) Fluorescent display desktop electronic calculator. 14-digit display two memory registers. Fixed decimal w/ rotary-switch selectable decimal point location. Early Toshiba Small-Scale MOS integrated circuit design.
Late 1960's Nixie-display electronic calculator. 16-digit display, floating decimal, two memory registers. Square root and percent functions.
Late 1960's Nixie-display electronic calculator. 16-digit display, four-function with automatic square root and percent calculations. Small-scale integrated circuit logic. Electro-mechanical item counter.
Follow-on to the BC-1623 adding 30 steps of learn-mode programmability and an additional memory register.
Late 1960's Nixie-display electronic calculator. Four function with percent. 16-digit display. Two accumulator-style memory registers. Small-scale integrated circuit logic. Electro-mechanical item counter.
Late 1960's Nixie-display electronic calculator. 16-digit display, extended memory capabilities. At the high-end of Toshiba's 2nd generation of desktop electronic calculators.
Uchida Yoko USAC 10B
Product of large Japanese manufacturing conglomerate, Uchida Yoko Co., Ltd. Claims to be the world's first all integrated circuit desktop electronic calculator, though this is a claim that is unlikely to be true. Introduced sometime in mid to late 1967. Ten digit, four function machine with single accumulating memory register. Nixie tube display. Interested in the machine itself, as well as any other information about the company and its electronic calculators.
Victor 3900 Calculator
First electronic calculator introduced by Victor Comptometer in October of 1965. Breakthrough MOS LSI integrated circuit design that was way ahead of its time. 20 Digit capacity with CRT display, floating decimal, four function with three memory registers, two of which are always displayed. Also marketed for a short period of time as the Philco-Ford 3900.
Victor 1400-series Calculator
Early Victor CRT-display calculator, introduced in 1969. Early Small-Scale Integration circuitry with magnetostrictive delay-line register storage, similar technology-wise to Friden 1162. Three line CRT display. 14 Digit capacity, fixed decimal, four function plus memory function, and constant. Two versions: 14-321 provides a single memory register, while 14-322 offers two memory registers. A later revision of both machines replaced the delay line with two MOS shift register ICs.
Any Victor 1500-series Calculator
Desktop printing electronic calculators, made in West Germany by Wanderer Werke, AG and Nixdorf Computer. Victor Comptometer was an OEM customer, and marketed the machines in North America as the 1500-series calculators, after its difficulties with its state-of-the-art shattering Victor 3900. Known models: 1503 (3 memories), 1503R (3 memories and square root), 1510 (10 memories), 1510R (10 memories and square root).
Victor 1800-1721 Scientific Calculator
The high-end of the Victor 1800-series display calculators. Scientific functions, including trig and logarithms. Panaplex display, 14 digit capacity. Automatic floating decimal.
Any Victor 4000-series Programmable Calculator
A series of five programmable print-only microprocessor-driven electronic calculators, including the Any model Wanderer Conti Calculator
Desktop electronic printing calculators produced by German company Wanderer Werke, AG. Numerous models, including the Conti, Conti 10, Conti R, Conti 10R, Conti MR, Conti AF, Conti AFD, Conti D, Conti P, Conti M. The original Wanderer Conti was introduced in 1965, with electronics designed by Nixdorf. Calculators themselves, or any documentation for these machines is wanted. Nixdorf Computer later purchased Wanderer Werke, and sold the machines under the Nixdorf brand, as well as offering the machines to OEM customers, most notably, Victor Comptometer in the US. The machines were marketed in North America by Victor Comptometer as the Victor 1500 series. The calculators were also marketed by Sumlock Comptometer in Europe, to add printing calculator capability to Sumlock's line of Nixie-tube display calculators. The initial calculators were made with discrete Silicon transistor logic, and use magnetic core memory for register storage. A microcoded architecture (arguably the first fully microcode-driven electronic calculator sold) is used with a wire rope microcode store holding the microinstructions that govern the operation of the calculator.
Wang Laboratories' first electronic calculator, introduced sometime in 1964. Quickly superceded by the Wang LOCI-2, which added more accuracy and punched-card based programming capabilities.
Introduced in mid-1970, the 100-series calculators filled a niche between the now dated Wang 300-series calculators, and the higher-end Wang 700-Series calculators. 12-digit capacity. Nixie display and print-only versions. Small and Medium-Scale DTL & TTL Integrated circuits make up the logic of the machines. Models targeted at business, scientific, and statistical applications. See the Old Calculator Museum's exhibit on the Wang 144T for more information.
Programming Keyboard for Wang 300-series Calculating System. 10-digit Nixie tube display, mag-tape cartridge in back of cabinet for program storage.
400-series Programmable Calculator
Wang's final generation of programmable electronic calculators. Various models, including advanced statistics(Model 462), surveying(Model 487), and scientific(Model 450, 452). Up to 320 steps of learn-mode programmability. Approx. 10 1/2" Wide, 14" Deep, 5 1/2" High. Burroughs Panaplex-style 7-segment planar display versus Nixie tube displays of earlier Wang calculators. Introduced late 1972/early 1973. Uses solid-state MOS RAM and ROM versus magnetic RAM/ROM of earlier Wang calculators. Design based on architecture of earlier Wang 700-series calculators, but updated with newer IC technology.
Any Wang 500-series Programmable Calculator
Programmable 3nd Generation Wang Scientific Calculator. Available as Model 500 or Model 520, with varying program step and memory capacities. Single-row Nixie tube display. Optional built-in Magnetic Cassette tape drive and 21-column 160LPM drum printer. Based on architecture of Wang 700-series calculators, but somewhat scaled back to reduce cost. Uses small and medium-scale integrated circuit technology, with Wang's first use of solid state (Intel 2102 1Kx1 bit RAM) memory instead of magnetic core. Utilizes ferrite transformer microcode store design of Wang 700-series.
C-series Desktop Calculator
Wang's last generation of desktop calculators. Very similar to the 400-series calculators, but without learn-mode programming capabilities. Burroughs Panaplex-style 7-segment planar display. Introduced late 1972/early 1973. Uses solid-state RAM and ROM versus magnetic RAM/ROM of earlier Wang calculators.
Wyle Model WS-01 or WS-02 'Scientific' Electronic Calculator
Early desktop programmable, introduced in late 1964. Eight inch integrated CRT display. Six lines of 24 digits (grouped in three digit chunks) on display. One-key Square Root, three 'memory' registers. Optional punched card reader. Model WS-01 uses small magnetic drum for working register storage, while WS-02 replaced the drum with a magnetostrictive delay line. A product of Wyle Laboratories, El Segundo, California.
Old Calculator Accessories and Documentation WANTED
Wang 301 Column Printer
Wang 300-Series drum impact printer peripheral, introduced late 1969.
Wang 703 Data Editor
Punched paper-tape editor/reformatter peripheral for Wang 700-Series programmable calculators. Allows data to be fed to a Wang 700-Series calculator, with on-the-fly formatting and blocking occurring as the tape is read. Rack-mounted or table-top form factor, with the rackmount version adding a series of plugboards and switches to allow the formatting and blocking operations to be configured. High-speed eight-level paper tape reader reads data from punched tape on command from the Wang 700-series calculator. Used primarily for input of data to the Wang 700 calculator from other data processing or data acquisition sources which generate punched tape as their output.
Magnetic Cards for Sony Sobax ICC-2500W or Sony Sobax ICC-2550W Calculators
Any manuals for the Texas Instruments SR-60
Owner/Operator Manual: Sharp Compet 20
Other Related Items WANTED
McGraw-Hill Publishing's Product Engineering Magazine - February 24, 1969 Edition
Featuring Calculator Innovator Dr. An Wang. and New Wang 700 Calculator
Wang Laboratories Field Facts Magazines
An internal periodical published by Wang Laboratories, focusing on providing information to the field sales and service forces on Wang's calculator and other products.
Wang Laboratories Programmer Magazines
Monthly periodical published by Wang Laboratories, focusing on their electronic calculator technology and its applications.
Specific editions wanted: July 1967 (Vol. 1, No. 1); August 1967 (Vol. 1, No. 2), September 1967 (Vol. 1, No. 3); November, 1969 (Vol. 3, No. 10); January, 1971 (Vol. 5, No. 2); June, 1977 (Vol. 11, No. 2); December, 1977 (Vol. 11, No. 4)
Administrative Management Magazines
Any "Administrative Management" (The Magazine of Methods, Personnel and Equipment)" Magazines in good condition from 1961 through 1973.
Popular Electronics Magazines
Any "Popular Electronics" Magazines in good condition from 1963 through 1973. Specifically looking for November, 1971 issue.
Calculators and Related Items For Sale/Trade
The items listed here are for trade. If you have an interest in any of the items shown here, and have an item that you believe may be of interest to me, please EMail me. If you wish to purchase rather than trade, I'll consider offers, but generally prefer to trade if possible.
HP98210A String-Advanced Programming ROM Cartridge for HP9825
Works fine. Provides a number of enhancements to the HPL programming environment on the 9825.
HP 98216A 9872A Plotter - General I/O - Extended I/O ROM Cartridge for HP9825
Works fine. Provides enhancements to HPL programming environment to allow for I/O to external devices (via external device interfaces plugged into the 9825) and plotting capabilities for the HP9872A Plotter. No interfaces included, just the ROM cartridge.