Sinclair Oxford was a range of low-cost scientific calculators manufactured and sold by Sinclair Radionics in England from 1975 until 1976. The first model was the Oxford 100, launched in Spring 1975 for GB£12.95; this model was based on the Gillette GPA from late 1974 that was made by Sinclair for Gillette in a slightly different case. Both the Gillette GPA and Oxford 100 models used 8 digit displays with red light-emitting diodes (LEDs), 4 functions, 9 volt PP3 batteries. Both models measured 73 x 155 x 34 mm (2.9 x 6.1 x 1.3 inches).
All the Oxford models were similar in appearance; the 150 was introduced in 1975 introducing the ability to calculate percentages and square roots. The Oxford 200 included memory and sold for £19.95. The Oxford 300 was a scientific model with a limited number of functions (such as sin, cos, tan), which sold for £29.95, much lower than the competition. The last two models, the Oxford Scientific (1976) and Oxford Universal were the most advanced of the range.
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