Inventor and entrepreneur Sir Clive Sinclair has died at age 81. | Photo by Evening Standard/Hulton Archive/Getty Images

Clive Sinclair, who invented the Sinclair ZX Spectrum, an early personal computer, died of cancer Thursday at age 81, his family confirmed. Sinclair was an inventor with an impressive list of electronic products to his name, some, like his pocket calculator, were quite successful, while others, like his Sinclair C5 “electric trike” vehicle, were decidedly not.

Born in England in 1940, Sinclair had a knack for creating gadgets. The Sinclair Executive “slimline” pocket calculator, released in 1972, sold well (likely in large part due to its low price ), and at one point was displayed at the Museum of Modern Art.

Sinclair’s ZX personal computers were priced lower than the then-popular Commodore 64, and well-liked by consumers in the UK….

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