Unisonic 830-A Handheld Electronic Calculator

This handheld electronic calculator has a black- and silver-colored plastic and metal case with an array of twenty-one square plastic keys. These include ten digit keys and a decimal point key (white) as well as four arithmetic function keys, a total key, a clear key, a clear entry key, and a percentage key (turquoise). The square root and change sign keys in the topmost row are orange. Right of these, a mark scratched on the case reads: UNISONIC-830A. Right of this is an on/off switch. Behind is an eight-digit green vacuum fluorescent display. A power jack is on the back edge.
A paper sticker on the back gives calculation examples. It reads in part: 830A. It also reads: SERIAL NO. (/) 004991 (/) MADE IN JAPAN. Below this is a compartment for four 1.5V (AAA) batteries.
Compare 1986.0988.114 (a Unisonic 811-A). That calculator lacks the square root and change sign keys.
No references found.
Currently not on view
Object Name
electronic calculator
date made
ca 1977
Physical Description
plastic (case; keys material)
metal (trim; circuitry material)
glass (display material)
paper (sticker material)
overall: 1 1/8 in x 3 1/4 in x 5 1/4 in; 2.8575 cm x 8.255 cm x 13.335 cm
Place Made
ID Number
accession number
catalog 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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