ROM Disassemblies were a very popular learning aid for home computers in the 1980’s. Usually they where in book form and most popular computers had at least one. The ZX Spectrum was very popular.
The Complete Spectrum ROM Disassembly book by Frank O’Hara and Ian Logan is the book I suspect many of familiar with, I know it was the first one I came across in my Spectrum days. It’s one of the best ROM listings I’ve read. Making it a great educational source for anyone interested in Z80 code.
Here’s the list:
The Complete Spectrum ROM Disassembly
https://worldofspectrum.net/item/2000076/
https://archive.org/details/CompleteSpectrumROMDisassemblyThe
Spectrum ROM Disassemblies
https://github.com/ZXSpectrumVault/rom-disassemblies
The Uncommented Spectrum ROM Assembly
https://github.com/cheveron/zxrom
Spectrum ROM disassembly
https://github.com/skoolkid/rom
Spectrum 128 ROM disassembly
http://www.fruitcake.plus.com/Sinclair/Spectrum128/ROMDisassembly/Spectrum128ROMDisassembly.htm
Timex Sinclair 2068 ROM disassembly
https://www.timexsinclair.com/computers/timex-sinclair-2068/technical/home-rom-disassembly/
If you know of any more please leave me a comment and I’ll add them to the list.
Please check out my “8-bit Shack” retro computing channel
and my Tindie store.
Thanks