Texas Instruments TI-1025 Handheld Electronic Calculator

Texas Instruments TI-1025 Handheld Electronic Calculator

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This is one of a series of handheld electronic calculators manufactured by Texas Instruments. It has a black plastic case, a metal keyboard, and an array of twenty-four rectangular black plastic keys. In addition to ten digit keys and four arithmetic function keys, there are clear entry/clear/ON, decimal point, total, OFF, change sign, percentage, and four memory keys. Behind these is an eight-digit fluorescent display. A mark between the display and the keyboard reads: TI-1025. A socket for a battery adapter is on the right edge.
The back has a compartment for a battery at the center. A above this reads: TEXAS INSTRUMENTS (/) electronic calculator (/) A DIM OR ERRATIC DISPLAY INDICATES (/) A DISCHARGED BATTERY. A mark below the compartment reads in part: SERIAL NO. (/) 5096413 4577 (/) ASSEMBLED IN HONG KONG. Twelve patent numbers are listed, ranging from 3819921 to 4014013
U.S. Patent 3819921 was granted to J. Kilby, J. Merryman, and T. J. Van on January 25, 1974, and assigned to Texas Instruments. U.S. Patent 4014013 was granted to David J. McElroy on March 22, 1977.
Compare to 1987.0435.17 and 1986.0988.191. This calculator closely resembles one version of the Western Auto Citation in general appearance and the selection of keys. The keyboard finish is different.
Currently not on view
Object Name
electronic calculator
Other Terms
electronic calculator; Handheld
date made
ca 1978
Texas Instruments
place made
China: Hong Kong
Physical Description
plastic (case; keys; display cover material)
metal (circuitry; keyboard material)
rubber (feet material)
overall: 1/4 in x 2 3/4 in x 1/2 in;.635 cm x 6.985 cm x 1.27 cm
ID Number
accession number
catalog number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Computers & Business Machines
Handheld Electronic Calculators
Data Source
National Museum of American History
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I have one of these calculators, which I bought in 1978 when I was in the US Army stationed at Fort Meade, MD, and I have the original box and operating instructions. Mine appears identical to the one pictured, with a few minor differences. 1. On the back, the space below the words "SERIAL NO." is blank. 2. The space to the right of that contains the numbers "27 80". 3. Below that appear the words "ASSEMBLED IN EL SALVADOR". The first and last patent numbers are the same, as are likely the rest as well. The battery compartment lid catch is broken, otherwise, it appears to be in very good condition. I also have a book purchased at the same time entitled "The Great International Math on Keys Book", with a note inside "Ser. No. 3285585. This book was written for the similar TI-30/SR-40 calculator.

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