 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[1][2] |
| 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) |
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, the calculator was produced in at least two versions with different keyboard markings; a variant called the Sinclair Executive Memory was introduced in 1973.
Its small size was made possible by pulsing current to the Texas Instruments TMS1802 "calculator on a chip" integrated circuit, reducing the power consumption more than tenfold. The Executive was highly successful, making £1.8 million of profit for Sinclair and winning a Design Council Award for Electronics.
- ^ Cite error: The named reference
vcwas invoked but never defined (see the help page). - ^ Tout, Nigel. "The Calculator-on-a-Chip". Vintage Calculators Web Museum. Retrieved 15 September 2017.