Sharp QT-8B Micro Compet Electronic Calculator

This Japanese-made non-printing electronic calculator is a relatively small and light desktop machine. It has an array of nine digit keys with a 0 and a decimal key below these. On the right are a clearance key, a key for indicating that multiplication (rather than addition) should be carried out, a key for indication that division (rather than subtraction) should be carried out, and a key for multiplication or division. The machine has an eight-digit capacity for all operations. In back of the keyboard is an eight-digit display. The on-off switch is on the side.
A mark on the front left reads: SHARP. A mark on the front right reads: microCompet. A mark behind the display reads: CORDLESS. A tag attached to the back reads in part: SHARP QT-8B (/) CORDLESS MICRO COMPET/. It also says in part: NO. 0067148 (/) SHARP ELECTRONICS CORPORATION (/) 10 KEYSTONE PLACE, PARAMUS (/) NEW JERSEY 07652 MADE IN JAPAN. The black carrying case has a handle.
The calculator fits into a plastic battery unit. The unit is plugged into the wall to operate the machine on alternating current or to charge the adapter. To operate the machine on direct current, the plug is not used and the switch is turned off. A mark on the back of the adapter reads: MICRO COMPET ADAPTOR. The adaptor has a gray cloth cover.
The instruction manual that comes with the calculator indicates that the machine incorporates four ELSIs (Extra Large Scale Integrations) with one 4-phase clock generator. The calculator was advertised in American newspapers from mid-1970 into 1971. The QT-8B (with the battery pack) cost $495.
Sharp Electronics Corporation, SHARP Electronic Calculator with ELSI Micro COMPET QT-8B Instruction Manual, no date.
[advertisement], Los Angeles Times, July 29, 1970, p. G5.
[advertisement], Chicago Tribune, December 2, 1970, p. G5.
[advertisement], The New York Times, January 9, 1971, p. 41.
Currently not on view
date made
ca 1970
Sharp Corporation
place made
Physical Description
plastic (case, keys material)
metal (wiring material)
overall: 3 1/4 in x 5 3/4 in x 10 1/4 in; 8.255 cm x 14.605 cm x 26.035 cm
ID Number
catalog number
accession number
Credit Line
Gift of Jon Eklund
See more items in
Medicine and Science: Computers
Desktop Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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