mirror of
https://github.com/holub/mame
synced 2025-05-22 05:38:52 +03:00
79f8cc1cf8
Sent: Sunday, November 02, 2008 1:04 AM To: Aaron Giles Subject: Z80 CPU change Hello Aaron, For a long time there was undiscovered internal register (MEMPTR) inside Z80 CPU which was visible by using BIT n,(HL) instruction in undocumented bits of flag, in last few months lot of things have been discovered by team of Russian programmers. There was a test on real machine which showed status of flags after each instruction. I am sending you now patch for Z80 with MEMPTR implemented, there is also one more bug fixed (BIT 6,(XY+o) was not implemented good it used BIT 4,(XY+o) code). As a proof that things are now valid, I am sending screens before patch on Z80 cpu core, and after with compare of results on real machine. I am also sending you a TZX file (for ZX Spectrum) since tests are done inside that driver. Please inform me about status. Hope this could fix some issues in drivers using Z80, since some games used this flags. Regards, Miodrag Milanovic |
||
|---|---|---|
| docs | ||
| src | ||
| .gitattributes | ||
| makefile | ||