Accumatic 100 Electronic Calculator

This small, desktop electronic calculator has ten digit buttons and a decimal point button on the left front. Five function buttons (for addition, subtraction, multiplication, division, total and canceling) are on the right front, along with an on/off button that causes the window over the display to rise. The calculator has a leather, cloth-lined case, which fits in a cardboard box. The paper instruction leaflet is dated 8/72. The instructions are given in English, French, German, and Spanish. The case has a space for a power adapter, but there is no adapter.
This is one of the first electronic calculators sold to have a liquid crystal display. The chips in it were made by Rockwell and, according to a mark on the object, the calculator was: assembled in Mexico primarily of Unted States parts. The serial number of this example is 134939 and it was sold by Lloyd's Electronics, Inc. of Compton, Calif. (near Los Angeles). According to an advertisement of the period, it sold for $99.95.
Compare 1990.0462.01, an Accumatic 70.
Guy Ball and Bruce Flamm, The Complete Collector's Guide to Pocket Calculators, Tustin, Calif.: Wilson/Barnett Publishing, 1997, pp. 88–92.
Currently not on view
Object Name
electronic calculator
date made
Lloyd's Electronics
Physical Description
plastic (overall material)
metal (overall material)
paper (overall material)
leather (overall material)
overall: 7 cm x 32.5 cm x 16 cm; 2 3/4 in x 12 25/32 in x 6 5/16 in
place made
United States: California, Compton
ID Number
accession number
catalog number
Computers & Business Machines
Desktop Electronic Calculators
See more items in
Medicine and Science: Computers
Desktop Electronic Calculators
Data Source
National Museum of American History, Kenneth E. Behring Center

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