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Sinclair ZX81

Sir Clive Sinclair launched the ZX81 in 1981, as a follow-up to the ZX80.  The white & blue casing of that machine was replaced with the now distinctive black ABS casing, reminiscent of earlier Sinclair products, and was again designed by Rick Dickinson.  Originally supplied in kit form by mail-order only, it introduced a generation - myself included - to programming, and trying to get the most out of that 'huge' 1K of RAM.