Texas Instruments TI-2500 (Datamath) Handheld Electronic Calculator

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Description
This is an example of the first model of an electronic calculator marketed by Texas Instruments under its own name. The handheld electronic calculator has a tan plastic case with a dark brown keyboard. It has an array of eighteen keys, sixteen of them square and two rectangular. These include ten digit keys, a decimal point key, a total key, four arithmetic function keys, a clear entry key, and a clear key. A switch at the right in the top row of keys may be set at “CHAIN” or “CONST.” A mark above this switch reads: Datamath. Behind the keyboard is an eight-digit LED display.
A jack for a power outlet is along the back edge. An on/off switch is on the left side. A sticker on the back reads: MADE BY (/) TEXAS INSTRUMENTS (/) INCORPORATED (/) DALLAS, TEXAS. Another sticker reads in part: TI-2500 electronic calculator. It also reads in part: Datamath (/) electronic calculator. It also reads in part: Serial Number (/) 2500-344952 (/) 001-E Manufactured in U.S.A. The sticker indicates that the calculator had a built-in battery that gave six hours of portable operation and fully recharged in ten hours.
Unscrewing three long screws on the back of the case allows one to remove the back. The inside has five chips. The largest reads: TMS0119NC (/) 7310 (/) ZA 072. This is a TMS0119 chip, manufactured in the tenth week of 1973. There is space for four soldered batteries.
This appears to be the second version of the TI-2500, introduced in February of 1973 for a price of $119.95. The calculator initially was introduced in 1972.
Compare 1986.0988.188, 1986.0988.189, 1986.0988.190, 1986.0988.342, and 1986.0988.359.
References:
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 157.
Online Datamath Museum, accessed May 13, 2015.
Location
Currently not on view
date made
1973
maker
Texas Instruments
place made
United States
Physical Description
plastic (case; circuit board; keys material)
paper (stickers material)
metal (circuitry; screws material)
Measurements
overall: 1/2 in x 2 3/4 in x 5 1/2 in; 1.27 cm x 6.985 cm x 13.97 cm
ID Number
1986.0988.189
accession number
1986.0988
catalog number
1986.0988.189
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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