Sinclair Executive

Sinclair Executive
	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)

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 vc was invoked but never defined (see the help page).
^ Tout, Nigel. "The Calculator-on-a-Chip". Vintage Calculators Web Museum. Retrieved 15 September 2017.

[vc-1] Cite error: The named reference vc was invoked but never defined (see the help page).

[tms1802-2] Tout, Nigel. "The Calculator-on-a-Chip". Vintage Calculators Web Museum. Retrieved 15 September 2017.

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