Sinclair Executive
The Sinclair Executive was the world's first "slimline" pocket calculator, and the first to be produced by Clive Sinclair's company Sinclair Radionics. Introduced in 1972, there were at least two different versions of the Sinclair Executive, with different keyboard markings, and another called the Sinclair Executive Memory, introduced in 1973.
Sinclair Executive Type 1 | |
| Introduced | September 1972 |
|---|---|
| Invented by | Clive Sinclair |
| Cost | £79.95 |
| Calculator | |
| Display type | Light-emitting diode |
| Display size | 8 digits |
| CPU | |
| Processor | Texas Instruments TMS1802NC |
| Frequency | 200 kHz |
| Other | |
| Power supply | 4 button cells |
| Power consumption | 20 milliwatts |
| Dimensions | 56 by 138 by 9 millimetres (2.20 in × 5.43 in × 0.35 in) |
Its small size was made possible by pulsing the current to the Texas Instruments TMS1802 "calculator on a chip" integrated circuit, reducing the power consumption by a factor of more than 10. The Executive was highly successful, making £1.8 million of profit for Sinclair and winning a Design Council Award for Electronics.
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