Texas Instruments Concept II Handheld Electronic Calculator

Description
Texas Instruments continued to manufacture calculators sold by other companies. This example was marketed by the Zayre department store chain. The handheld electronic calculator has a black plastic case and a metal keyboard. It has an array of twenty-four rectangular black plastic keys. The meaning of the keys is indicated on the keyboard. There are ten digit keys, a decimal point key, a total key, four arithmetic function keys, a clear key, a clear entry key, a change sign key, and a percentage key. Above these is a row of four memory keys. The on/off switch is on the left edge. A mark above keyboard on the left reads: TEXAS INSTRUMENTS. Behind the keyboard is an eight-digit LED display. A mark below the keys reads: CONCEPT II.
A jack for a power outlet is along the back edge. A sticker on the back reads: US PAT 3819921 AND OTHER PATS PENDING (/) TEXAS INSTRUMENTS (/) Concept II (/) Serial No. 1027861. It also reads in part: ASSEMBLED IN USA. Below the sticker is a compartment for a nine-volt battery. A mark below it reads: 4276 LTA. Unscrewing four screws on the back of the calculator does not reveal the chip.
Compare the Concept II calculator with the TI-1250 (1986.0988.053). By 1977 Zayre stores sold different calculators under the Concept name.
References:
[Advertisement], Hartford Courant , June 6, 1976, p. 8O, Selling for $14.77, regularly $18.77.
[Advertisement], Hartford Courant , December 5, 1976, p. 25L. Selling for $13.88, regularly $16.88.
Online Datamath museum, accessed June 3, 2015.
Location
Currently not on view
date made
1976
maker
Texas Instruments
Physical Description
plastic (case; keys material)
metal (keyboard; circuitry material)
paper (sticker material)
Measurements
overall: 1 1/4 in x 2 1/2 in x 5 1/2 in; 3.175 cm x 6.35 cm x 13.97 cm
ID Number
1986.0988.192
accession number
1986.0988
catalog number
1986.0988.192
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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