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Original Building Instructions and Circuit Diagrams
Complete Online ZX81 Kit Assembly Instructions
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Original Building Instruction Scans
This page has jpeg photo scans of the original building instructions and circuit diagrams which came with the ZX81 kits back in 1981.
You will be supplied a free set of building instructions with your ZX81 kit purchase , as well as the online version of the instructions here.
You are welcome to download and print out and keep these photo scans of the original instructions should you wish but please be aware they are very large and slow to download.