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Sinclair ZX81

Computer/ Day in Tech History

March 5, 1981: Timex Sinclair ZX81 launched

Jeffrey Powers @geekazine aggregator, altair, apple, apple computer, Atari, barak obama, building computers, cheap computer, cto, first apple, fred moore, Geek, homebrew computer club, iTunes, kundra, menlo, menlo park, menlo park ca, Menlo Park California, popular computer, Sinclair Research, Sinclair ZX80, Sinclair ZX81, Steve Job, steve jobs, steve wozniak, SteveWozniak, Timex Corporation, Vivek Kundra, WMS Industries 0 Comments March 5, 2018

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Sinclair ZX81
Sinclair ZX81

1981 – The successor to the Sinclair ZX80, Britain’s most popular home computer – the Sinclair ZX81 was launched by Sinclair Research – a Timex Corporation. It was a popular computer mostly because of the price – £69.95 ($99) or £49.95 in kit form.

The cheap computer had only a fraction of components that an Apple II did. Yet the Apple II was around £699. The Sinclair ZX81 only had 1 kB RAM with option to upgrade to 16 kB. The graphics were only in monochrome and the Z80 CPU ran at 3.25 MHz – 8-bit. This was actually faster than the Apple II processor (1.08 MHz) and only outbested by the IBM PC (4.77 MHz at 16-bit). The TI99/4A procesor was a 3Mhz 16-bit chip.

You could get a tape drive and printer, bringing the system up to about £160 ($250). The computer was succeeded by the ZX Spectrum.

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