Texas Instruments Concept II Handheld Electronic Calculator

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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.
[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.
Currently not on view
date made
Texas Instruments
Physical Description
plastic (case; keys material)
metal (keyboard; circuitry material)
paper (sticker material)
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
accession number
catalog number
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


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