Texas Instruments 1400 Handheld Electronic Calculator

This handheld electronic calculator has a dark brown plastic case and a metal keyboard. It has an array of twenty rectangular brown plastic keys. The meaning of the keys is indicated on the keyboard. There are ten digit keys a decimal point key, a total key, four arithmetic function keys, a clear key, a clear entry key, a change sign key, and a percentage key. The on/off switch is on the left edge. A mark above the keys reads: TI-1200.

A mark above keyboard on the left reads: TEXAS INSTRUMENTS. Behind the keyboard is an eight-digit LED display.

A jack for a power outlet is along the back edge. A sticker on the back reads: US PAT 3819921 AND OTHER PATS PENDING (/) TEXAS INSTRUMENTS (/) Serial No. A 271475. The sticker indicates that the calculator should be recharged using an AC9180 adapter/charger. It also reads in part: ASSEMBLED IN USA. Below the sticker is a compartment for a nine-volt battery. A mark below it reads: 3876 LTA.

Unscrewing four screws in the back reveals the display and a chip. A mark on the chip reads: TMS0972NL (/) ZA0348 (/) ASP7624. This is a TMS0972 chip.

Compare the TI-1200 (1986.0988.074). The TI-1200 lacks a change sign key.

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