Casio Mini CM-602 Handheld Electronic Calculator

This handheld electronic calculator is a modified version of Casio’s first commercial handheld electronic calculator, the Casio Mini. It has a black plastic case with aluminum trim on the front. The array of square plastic keys on the right side includes ten digit keys, a decimal point key, a cancel key, keys for four arithmetic functions, a total key, and an arrow key that is pressed to show more of larger results. Left of the cancel key on the top row of keys is a switch to set the position of the decimal point.
To the left of the keyboard is a six-digit vacuum fluorescent display. Below it is the on/off switch. A mark right of the switch reads: CASIO-MINI (/) ELECTRONIC CALCULATOR. A carrying loop extends from the left edge. This edge also has a socket for a power adapter. A mark inscribed on the trim on the front edge reads: Bob Clemens.
Unscrewing screws on the two ends of the calculator makes it possible to remove the top. A sticker attached in front of the keyboard on the inside reads: 3084597. A mark on a chip below the display reads: 3F 4 (/) HD32154P. This is a large-scale integrated chip made by Hitachi. Above it is a chip made by NEC with number μPD129C.
The back of the calculator has a compartment that would hold four batteries. A mark on the back reads: MINI CM-602 ELECTRONIC (/) CALCULATOR (/) BATTERY SUPPLY 1.5 V x 4 or (/) use AC ADAPTOR AD-4145 (/) 500mW MADE IN JAPAN (/) CASIO COMPUTER CO., LTD. A stcker below this gives operating instructions.
A mark on a sticker on the back of the battery compartment reads: 486383.
A June 1973 illustration of the Casio Mini in the Los Angeles Times shows this model calculator. It was on sale for $59.95.
Compare 1986.0988.184.
Rick Bensene, Old Calculator Museum website.
Los Angeles Times, June 30, 1973, p. D2.
Website of Casio International.
Currently not on view
Object Name
electronic calculator
date made
Casio Computer Company
Physical Description
plastic (case; keys; switches; circuit board material)
glass (tubes material)
paper (stickers material)
metal (circuitry; trim material)
overall: 1 3/8 in x 6 in x 3 1/8 in; 3.4925 cm x 15.24 cm x 7.9375 cm
place made
ID Number
accession number
catalog number
Handheld Electronic Calculators
Computers & Business Machines
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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