How to install a ZX81 16K Ram expansion - 10 minute mod!
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ZX81 repair
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ZX-81 memory mod, case & keyboard restoration, test-drive (Pimp My Eight, episode 4, part 3)
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ZX81 still awesome after 40 years!
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ZX81 Part 2 – Upgrading the on board memory from 1K to 16K
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Oric Repair: The "Impossible" RAM Failure
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My first PCB! A Tandy 1000 EX/HX RAM expansion board
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