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.

Date Made: ca 1970

Maker: Sharp Corporation

Location: Currently not on view

Place Made: Japan

Subject: Business


See more items in: Medicine and Science: Computers, Computers & Business Machines, Desktop Electronic Calculators


Exhibition Location:

Credit Line: Gift of Jon Eklund

Data Source: National Museum of American History

Id Number: 2006.0132.22Catalog Number: 2006.0132.22Accession Number: 2006.0132

Object Name: electronic calculator

Physical Description: plastic (case, keys material)metal (wiring material)Measurements: 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


Record Id: nmah_1303471

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