* [https://zx-pk.ru/threads/34173-revers-inzhiniring-z80.html ZX-PK forum topic on reverse engineering the Z80 (RU)]
* [[Media:Memptr eng.txt|MEMPTR, esoteric register of the Z80 CPU]] [https://github.com/raxoft/z80test/pull/3 inir/indr/otir/otdr instructions and MEMPTR]
* [[Media:Z80-documented-v0.91.pdf|The Undocumented Z80 Documented]]
* [[Z80 - undocumented opcodes]]
* [https://popolony2k.com.br/xtras/programming/asm/nemesis-lonestar/8080-z80-instruction-set.html Mapping between i8080 and Z80 mnemonics]