Commodore MM-1 Handheld Electronic Calculator

Description
This handheld electronic calculator has a white case with black trim and metal keyboard, and eighteen square plastic "Klixon" keys. Such keys have a design trademarked by Texas Instruments and make a distinctive click when pressed. In addition to ten digit and one decimal point key, the calculator has four keys for arithmetic functions. One serves as a total key for addition, another as a difference key for subtraction. The top of the keyboard has a constant switch, a D key for recalling the display (which turns off after fifteen seconds), a clear entry key, and a red clear key. The on/off switch is below the keyboard along with a switch for setting the position of the decimal point.
The eight-digit red LED display is behind the keyboard. A cord for recharging the battery attaches at the back of the top. (This example has no cord.)
The back has four plastic feet. A metal plate there gives operating instructions. Text near the bottom reads: COMMODORE BUSINESS MACHINES, INC. (/) MODEL MM-1 (/) SANTA CLARA, CALIFORNIA (/) MADE IN U.S.A.
This was one of the first models of a handheld calculator sold by Commodore. It was manufactured by Bowmar/Ali and is similar to the Bowmar 901B.
Compare 1986.0988.098 (the Commodore Minuteman 2) and 1988.0988.129 (the Bowmar 901B).
References:
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 57.
Los Angeles Times, March 14, 1972, p. C5. Advertised as selling for $179. “Now you can face this year’s taxes with confidence.”
Location
Currently not on view
Object Name
electronic calculator
date made
ca 1972
distributor
Commodore Business Machines, Inc.
maker
Bowmar/Ali
Physical Description
plastic (case; keys; display material)
glass (tube material)
metal (circuitry; keyboard material)
Measurements
overall: 1 1/2 in x 3 1/2 in x 6 in; 3.81 cm x 8.89 cm x 15.24 cm
place made
United States
ID Number
1986.0988.099
catalog number
1986.0988.099
accession number
1986.0988
subject
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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