SIR Clive Sinclair, the British computer pioneer, has died aged 81.
The inventor's daughter said today he died after a long illness at home in London.
Sir Clive became a household name after for computers into people's homes with his ZX Spectrum.
The computer went on to inspire the modern-day games industry.
Many of the bosses learned how to use computers on the ZX Spectrum.
As well as bringing computers into high-street stores at affordable price, Sir Clive invented the pocket calculator.
But his battery-powered Sinclair C5 tricycle failed to sell an expected 100,000, with the company that made them going into receivership.
His daughter, Belinda, told The Guardian: "He was a rather amazing person. Of course, he was so clever and he was always interested in everything.
"My daughter and her husband are engineers so he'd be chatting engineering with them."
Sir Clive founded Sinclair Radionics after leaving school at 17 and working as a journalist.
During the early 1970s, he invented several calculators that were small and enough to fit into pockets.
Sir Clive unleashed a revolution when he unveiled the ZX80 in January 1980 — the world’s first cheap home computer.
It cost £79.95 in kit form and £99.95 assembled, around a fifth of the price of other home computers at the time.