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Sinclair Cambridge models |
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The Sinclair Cambridge was introduced in summer 1973, and was the first of a range of a dozen models and variations. This page illustrates the several varieties of the basic Sinclair Cambridge calculator, which can be distinguished by the key arrangements. |
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Sinclair Cambridge type 1 |
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Sinclair Cambridge (type 1). 8 digits, red LED. 4-functions, constant. Has [C] and [K] (constant) keys. Batteries: 4x AAA. Main integrated circuit - General Instruments Microelectronics GI-C550, here date coded mid-1973. 50 mm x 111 mm x 28 mm (2" x 4.4" x 1.1"). Made in England. The first of the very small Sinclair Cambridge series, introduced in Summer 1973, costing in Britain £43.95 Sterling (US$105). The case has a glossy finish, with a poorer quality moulding than usual for Sinclair. The main chip is in a more expensive ceramic package. |
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Sinclair Cambridge type 2 |
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Sinclair Cambridge (type 2). 8 digits, red LED. 4-functions. Batteries: 4x AAA. Main integrated circuit - Texas Instruments TMS0801NC, here date coded end of 1973. 50 mm x 111 mm x 28 mm (2" x 4.4" x 1.1"). Made in England. |
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Sinclair Cambridge type 3 |
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Sinclair Cambridge (type 3). 8 digits, red LED. 4-functions, constant. 6v (4 x AAA). Main integrated circuit - General Instruments Microelectronics GIMT-CZ550,here date coded to the end of 1975. 50 mm x 111 mm x 28 mm (2" x 4.4" x 1.1"). Made in England. A later, more common, version of the Cambridge. |
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Sinclair Cambridge type 4 |
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Sinclair Cambridge (type 4). 8 digits, red LED. 4-functions, %. Batteries: This model takes only 2x AAA. Main integrated circuit - General Instruments G-595, here date coded to the end of 1975. 50 mm x 111 mm x 28 mm (2" x 4.4" x 1.1"). Made in England. |
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Note the use of LED displays made by Bowmar, the pioneering U.S. calculator manufacturer. When first introduced in summer 1973 the Cambridge cost £43.95 Sterling [about US$100]. |
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Vintage Calculators |
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© Text & photographs copyright Nigel Tout 2000-2008 except where noted otherwise. |
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