Texas Instruments SR-10 Handheld Electronic Calculator

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Description
This is an example of the first model of a scientific calculator marketed by Texas Instruments. The handheld electronic calculator has a black- and ivory-colored plastic case with an array of twenty-three plastic keys. Twenty-one of these are square; the 0 and the total keys are rectangular. In addition to ten digit keys, a decimal point key, a total key, and four arithmetic function keys, the calculator has a reciprocal key, a square key, a square root key, a change sign key, an enter exponent key, a clear key, and a clear display key. Text on the keyboard, above the keys and to the left, reads: SR-10. Behind the keyboard is a twelve-digit LED display. Numbers larger than eight digits are displayed in scientific notation. A mark behind the display reads: TEXAS INSTRUMENTS. An on/off switch is right and slightly above this.
The back edge of the calculator has a jack for a recharger/adapter. A sticker on the back gives extensive instructions. It also gives the serial number SR10 794630. A small round sticker above the large sticker reads: INSPECTED (/) BY L-01.
Unscrewing screws near the top and bottom of the back reveals the workings of the calculator. It has a total of five chips. The largest of these is marked TMS0120NC (/) C7421. This is a TMS0120 chip, manufactured in mid-1974. Also in the case is space for three AA nickel-cadmium batteries.
The leather zippered case has both a loop and a hook for attaching the calculator to a belt.
Texas Instruments described the SR-10 as an “electronic slide rule calculator,” hence the “SR” in the name. The first version of the device, introduced in 1972, did not have the mark SR-10 on the keyboard. The second version (introduced in 1973) and the third (introduced in 1975) did. This is an example of the second version.
Compare 1986.0988.351, 1986.0988.354, and 1986.0988.356.
References:
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 153.
The online Datamath Museum includes versions of the SR-10 from 1972, 1973, and 1975.
Location
Currently not on view
date made
1974
maker
Texas Instruments
place made
United States: Texas, Dallas
Physical Description
plastic (case; keys; circuit board material)
metal (circuitry; zipper material)
leather (carrying case material)
cloth (carrying case lining material)
Measurements
overall: 1 1/2 in x 3 in x 6 1/4 in; 3.81 cm x 7.62 cm x 15.875 cm
ID Number
1986.0988.351
catalog number
1986.0988.351
accession number
1986.0988
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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