Texas Instruments SR-10 Handheld Electronic Calculator

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.

Date Made: 1974

Maker: Texas Instruments

Location: Currently not on view

Place Made: United States: Texas, Dallas

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

Exhibition:

Exhibition Location:

Credit Line: Gift of John B. Priser

Data Source: National Museum of American History

Id Number: 1986.0988.351Catalog Number: 1986.0988.351Accession Number: 1986.0988

Object Name: electronic calculatorOther Terms: electronic calculator; Handheld

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

Guid: http://n2t.net/ark:/65665/ng49ca746a1-3977-704b-e053-15f76fa0b4fa

Record Id: nmah_334393

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.