ZX81
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The ZX81 is a home computer developed by Sinclair Research and manufactured in Dundee, Scotland, by Timex Corporation. It was launched in the United Kingdom in March 1981 as the successor to Sinclair'
Sinclair ZX81 PCB Revision 3 keyboard
Left side and rear views of the ZX81, showing its edge connector, the three input/output sockets (TV, EAR, MIC) and the 9 V DC power socket
The Sinclair Executive "slimline" pocket calculator (1972)
The Science of Cambridge MK14 (1978), sold in kit form, was Sinclair's first computer.
ZX80
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The Sinclair ZX80 is a home computer launched on 29 January 1980 by Science of Cambridge Ltd.. It was one of the first computers available in the United Kingdom for less than a hundred pounds. It was
ZX81
…Research and manufactured in Dundee, Scotland, by Timex Corporation. It was launched in the United Kingdom in March 1981 as the successor to Sinclair's ZX80 and designed to be a low-cost introduction to home computing for the general public. It was hugely successful; more than 1.5 million units were sold…
ZX80
Inside the ZX80: The Z80 is the large chip in center. 4K ROM is the medium-sized chip in the upper right. 1K RAM is implemented by two chips in the upper left. The video modulator is the metal box at the top.
Upgraded ZX80 showing the ZX81-style replacement keyboard overlay for use with the 8K ROM
ZX Spectrum 48k