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  8K BASIC ROM Upgrade Pages Flicker-Free Technique Back Porch Generator Circuit Page Volume Tester Utility Page  
8K ROM Upgrade Flicker-Free Technique Back Porch Generator Volume Tester
  4K ROM Software Archive Pages 4K ROM Book Archive Pages Chroma 80 Interface Pages Dual ROM Loading Resource Page  
4K ROM Software 4K ROM
Book Programs		 Chroma 80 Interface Dual ROM Loading
If you have any original commercial software for the ZX80 then I would be keen to obtain a recording of it for digital preservation and analysis.