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If you're interested in secrets for the Z80, shameless plug ! I gave a talk at FOSDEM this year on secrets that were discovered 30-36 years after its release (M
by Aissen 4y ago
If you're interested in secrets for the Z80, shameless plug ! I gave a talk at FOSDEM this year on secrets that were discovered 30-36 years after its release (MEMPTR and some of SCF/CCF behavior): https://archive.fosdem.org/2022/schedule/event/z80/ https://archive.fosdem.org/2022/schedule/event/z80/
There are even more secrets that were discovered in recent years that aren't in the talk.
- q-big 4y ago> There are even more secrets that were discovered in recent years that aren't in the talk. Could you give details?
- Aissen 4y agoDespite giving a talk, I'm not an expert on the subject, but if you look at ZX Spectrum forums and the ZX Spectrum discord, you'll find more information: the block instruction flags, the NMI preservation during reset, SCF/CCF flag instability. I haven't researched any of those yet, but many have and did publish those results ! redcode's Z80 emulator seems to be the most up-to-date on those subjects: https://github.com/redcode/Z80/blob/master/THANKS https://github.com/redcode/Z80/blob/master/THANKS (has many links to the various reverse engineered parts).