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From Wikipedia, the free encyclopedia The Sinclair ZX81 home computer, released by Sinclair Research in 1981, was the follow up to the company's ZX80. The case was black, with a membrane keyboard; the machine's distinctive appearance was the work of industrial designer Rick Dickinson. Video output, as in the ZX80, was to a television set, and saving and loading programs was via an ordinary home audio tape recorder to audio cassette. Timex Corporation manufactured kits as well as assembled machines for Sinclair Research. In the United States a version with double the RAM and an NTSC television standard was marketed as the "Timex Sinclair 1000". In home computing the ZX81 was very significant historically because it was the first home computer under £100 (in kit form), and therefore sold in great volume compared to other home computers of the period.
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