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zx81 00The Sinclair ZX80 is a home computer launched on 29 January 1980 by Science of Cambridge Ltd. (later to be betterzx80 01 known as Sinclair Research). It is notable for being one of the first computers available in the United Kingdom for less than a hundred pounds. It was available in kit form for £79.95, where purchasers had to assemble and solder it together, and as a ready-built version at £99.95.The ZX80 was very popular straight away, and for some time there was a waiting list of several months for either version of the machine.

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Wikipedia ZX80