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In my BBC Micro section, about half way down, are the entries for the ZX81...
https://msknight.com/bbc/
Yet unfinished is the ROM section, as I have queries with a few suppliers about a 100 year EEPROM and if that fails then I have to query about EPROM programming... but that will likely be a few weeks away yet. I have also to add a few more pictures in the opening the zeddy section. I will also be re-reading what I've written (as I do) and possibly tighten some of my loose explanations as time goes on.
If anyone spots any errors, things I should add or credits and quotes that I've missed, please do let me know. I have another zeddy here to go through (which I am intending to put in a pine case which I hope to resemble the sloping C64) so there will no doubt be more experience taking that apart, to add to the troubleshooting section.
There are a few more pictures of the first zeddy in the first case, in the mechanical keyboard section.