ZX81 Part 2 – Upgrading the on board memory from 1K to 16K
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ZX81 Part 2 – Upgrading the on board memory from 1K to 16K,Building a new ZX81 Computer | hackup.net,Retro.Engineer - Sinclair ZX81 A,My first computer: Sinclair ZX81,Can anyone identify my 16K Rampack? - Sinclair ZX80 / ZX81 / Z88 Forums