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| author | Nebuleon Fumika | 2012-12-20 18:10:38 -0500 |
|---|---|---|
| committer | Nebuleon Fumika | 2012-12-20 18:14:24 -0500 |
| commit | 80858801300a2f48ad250721a79ebc7b1b0aba92 (patch) | |
| tree | a64d661a5e40b759a083a653841dff2ae82fa130 /source/ppu.h | |
| parent | 83426640a6079021815e611ff0519d27ca3f9ce4 (diff) | |
| download | snes9x2005-80858801300a2f48ad250721a79ebc7b1b0aba92.tar.gz snes9x2005-80858801300a2f48ad250721a79ebc7b1b0aba92.tar.bz2 snes9x2005-80858801300a2f48ad250721a79ebc7b1b0aba92.zip | |
Remove the SNES Open Bus behaviour by default. Also simplify translation again.
SNES Open Bus is a quirk of the memory subsystem that allow reads of invalid addresses to return the last byte read from memory. However, it is seldom needed by a game, and it costs 1 to 3 MIPS instructions per SNES instruction to emulate.
If you need SNES Open Bus, you can remove -DNO_OPEN_BUS from the Makefile.
Diffstat (limited to 'source/ppu.h')
| -rw-r--r-- | source/ppu.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/source/ppu.h b/source/ppu.h index 5a889ef..6daf473 100644 --- a/source/ppu.h +++ b/source/ppu.h @@ -266,8 +266,10 @@ struct SPPU { // XXX Do these need to be added to snapshot.cpp? uint16 OAMWriteRegister; uint8 BGnxOFSbyte; +#ifndef NO_OPEN_BUS uint8 OpenBus1; uint8 OpenBus2; +#endif }; #define CLIP_OR 0 |