Calmax M16 Desktop Electronic Calculator

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This desktop electronic calculator has a cream-colored plastic case, plastic keys, a glass display window and display tubes, a rubber-covered cord, and metal circuitry. The keyboard has ten digit keys, a decimal point key, a sign change key, four arithmetic function keys, a clear key, two memory keys, and a key for moving to the right or left in the display. Behind the keyboard is an eight-digit vacuum fluorescent display that may be manipulated to show answers with as many as sixteen digits. The cord extends from the back of the machine.
A mark above the display reads: CALMAX M16. A tag on the back of the machine reads: CALMAX (/) AC 115 V 50/60HZ 5W(/) SERIAL No. 02320 MADE IN JAPAN.
Unscrewing four screws opens the case. One board, attached to the top part of the calculator, has a mark that reads: EL-8M. A second board, wired to the bottom, reads: EL-8M-2. One chip is marked: 10580SA (/) 2J 001 (/) SHARP. A second has a mark that reads: 10621SA (/) [. . .] (/) SHARP.
An April 1975 advertisement in the Washington Post indicates that the Calmax M16 desktop calculator with memory then had a sale price of $39.95. The original price is not given.
According to correspondence in the accession file, this calculator was used in the early to mid-1970s at the Washington office of the Institute of Public Administration of New York.
Washington Post, April 10, 1975.
Currently not on view
date made
ca 1975
place made
Physical Description
plastic (case; keys; circuit boards material)
metal (circuitry; screws material)
glass (display window; tubes material)
rubber (cord material)
overall: 2 1/2 in x 5 1/2 in x 8 in; 6.35 cm x 13.97 cm x 20.32 cm
ID Number
catalog number
accession number
See more items in
Medicine and Science: Computers
Desktop Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History


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