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Gillette GPA / Sinclair Oxford 100

Gillette GPA
Sinclair Oxford 100

Gillette GPA.

Display is 8 digits, red LED.

4-function.

9v (PP3 battery).

73 x 155 x 34 mm (2.9 x 6.1 x 1.3 ins).

Made in England (by Sinclair).

Sharp cornered casing.

Sinclair Oxford 100

Display is 8 digits, red LED.

4-function.

9v (PP3 battery).

73 x 155 x 34 mm (2.9 x 6.1 x 1.3 ins).

Made in England.

The Oxford 100 is only known with the type 1, sharp cornered, casing and LED display.

Price, April 1975[1] GBP £13.99 (about US$31).

The GPA was developed by Sinclair in late 1974 for Gillette, the razor company.  It was a short-lived model but formed the basis for the Sinclair Oxford 100, the first of Sinclair's Oxford range, which was launched in Spring 1975.

The Gillette model has a slightly cruder plastic casing.  The moulding on the Sinclair Oxford 100 is better and slightly more rounded.  This has been designated Oxford case type 1 on this site, and is always coupled with an LED display.

Later calculators in the Oxford range had a more stylish, more rounded casing, usually coupled with a green VFD display.  This has been designated Oxford casing type 2 on this site and can be seen on the other Oxford pages.

 

Reference:

  1. "news digest", Electronics Today International, May 1975, p6.

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