Commodore MM2SR Handheld Electronic Calculator

Description
This chunky handheld electronic calculator has twenty-three oval plastic keys. At the center is an array of ten digit keys with a decimal point key and a subtraction key. To the right of these are keys for multiplication, division, addition, and total. Left of the digit keys are memory, percentage, clear entry and clear keys. The row of keys at the top of the keyboard has square root, inverse, and squaring keys. The on/off switch is right of these. A mark behind the keyboard reads: commodore. Behind this is an eight-digit LED display. A socket for a power adapter is on the back edge.
The back of the calculator has a sticker with an “operating outline.” It reads in part: Model MM2SR (/) Voltage: 6V (/) Current: .2A. It also reads: Serial No. 140626. It also reads: Commodore Business Machines Inc. Made in USA.
Compare 1986.0988.128.
References:
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 58.
Los Angeles Times, October 24, 1974, p. A7. Calculator sells for $49.95.
Location
Currently not on view
date made
ca 1974
maker
Commodore Business Machines, Inc.
place made
United States
Physical Description
plastic (case; keys; display cover material)
metal (circuitry material)
glass (tube material)
Measurements
overall: 1 1/4 in x 3 1/2 in x 6 in; 3.175 cm x 8.89 cm x 15.24 cm
ID Number
1986.0988.100
catalog number
1986.0988.100
accession number
1986.0988
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center

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