Texas Instruments TI-1025 Handheld Electronic Calculator

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.

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