Sinclair launches the ZX81
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5th March 1981 On the 5th March 1981, the Sinclair ZX81 computer was launched as the successor to the ZX80. The ZX81 was hugely successful and brought computing to the average family with more than 1.5 million units sold. It was the first cheap mass-market home computer that could be bought from high street stores, such as W.H. Smith. The ZX81 was available ready-built (£69.95) or in kit form (£49.95). The ZX81 was based around the Z-80A CPU which ran at 3.5MHz. It came with 1K of RAM, and 8K of ROM providing a simple BASIC interpreter. Related information:
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