Sinclair Executive

Sinclair Executive
Sinclair Executive Type 1
IntroducedSeptember 1972
Invented byClive Sinclair
Cost£79.95
Calculator
Display typeLight-emitting diode
Display size8 digits
CPU
ProcessorTexas Instruments TMS1802NC[1][2]
Frequency200 kHz
Other
Power supply4 button cells
Power consumption20 milliwatts
Dimensions56 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.

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