This brings back memories. My first Z80 assembly program was a jetpac game for the Sinclair ZX80 around 1984 because I couldn't get a ZX Spectrum to play it. I

This brings back memories. My first Z80 assembly program was a jetpac game for the Sinclair ZX80 around 1984 because I couldn't get a ZX Spectrum to play it. I don't think any written copy still exists but there's still a copy on a cassette tape.