Unisonic 940-A Handheld Electronic Calculator

This handheld electronic calculator has a black and silver-colored plastic case and an array of nineteen rectangular plastic keys on a metallic-colored keyboard. It has ten digit keys, a decimal point key, a total key, four arithmetic function keys, a clear/clear entry key, a memory key, and a percentage key. The on/off switch is at the far right on the top row of keys. Text behind the keyboard reads: Unisonic 940. Behind this is an eight-digit green vacuum fluorescent display.
A jack for a power supply is on the right side.
A compartment for three AAA batteries is on the back. A sticker above this gives calculation examples. Text here reads in part: 940-A. It also reads: SERIAL NO. (/) 03885 (/) MADE IN JAPAN. The name “JOHN” is scratched in the plastic on the back of the calculator.
Compare the Unisonic 940 (1986.0988.319). The two calculators have cases and keys of somewhat different colors.
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 168.
Currently not on view
Object Name
electronic calculator
date made
ca 1978
Physical Description
plastic (case; keys material)
metal (circuitry material)
glass (display material)
overall: 1 in x 2 1/2 in x 3 3/4 in; 2.54 cm x 6.35 cm x 9.525 cm
place made
ID Number
catalog number
accession number
Computers & Business Machines
Handheld Electronic Calculators
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of John B. Priser
Additional Media

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