TI-SR-51A Version 1
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Texas Instruments SR-51A Version 1
The SR-51A was introduced shortly after the SR-51 to reduce manufacturing costs. You won't notice too much differences to the SR-51, the keyboard layout kept each key on it's place, only the colours changed. You have to open the calculator to understand the differences, the rigid inner keyboard frame of the SR-51 was removed, the LED modules replaced with a LED-stick and bubble-lens magnifier. The appearance of the SR-51A is similar to the later SR-52 and SR-56 calculators.
Date of introduction: June 1975
assembled in Italy and was kindly dontaed by Francis Hookham
Manufacturer: Texas Instruments
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This exhibit has a reference ID of CH31288. Please quote this reference ID in any communication with the Centre for Computing History.