Unisonic 940 Handheld Electronic Calculator

This handheld electronic calculator has a black 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. It also reads: SERIAL NO. (/) 001412 (/) MADE IN JAPAN.
Ball and Flamm give a 1978 price of $10.97 for this calculator.
Compare the Unisonic 940A (1986.0988.320).
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: 7/8 in x 2 1/2 in x 4 3/4 in; 2.2225 cm x 6.35 cm x 12.065 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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