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What about the ZX80 that preceeded it?? I bought one as a kit from Boots in the UK in 79'. I still have the ZX80 and 81. The ZX80 was the revolution, a total of only 4 ICs !. I made 16k RAM expansion packs and A/D conversion PCBs for them in 81' (in OZ). Sold many of them, specially to universities. Some of the projects done by universities with the A/D convertors were amazing (as a data logging device), there was nothing else at the time, at the price that could do anything close.
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