ShuriZma
/
fceux
mirror of https://github.com/TASEmulators/fceux.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Fix SYA and SXA opcodes in the CPU. blargg_nes_cpu_test5 now works

This commit is contained in:
qeeg 2021-07-03 10:27:56 -05:00
parent 7c70db115e
commit f3bab87c38
1 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/ops.inc
View File

@ -464,10 +464,16 @@ case 0x93: ST_IY(_A&_X&(((A-_Y)>>8)+1));
case 0x9F: ST_ABY(_A&_X&(((A-_Y)>>8)+1));
/* SYA */
case 0x9C: ST_ABX(_Y&(((A-_X)>>8)+1));
case 0x9C: /* Can't reuse existing ST_ABI macro here, due to addressing weirdness. */
{
unsigned int A; GetABIWR(A,_X); A = ((_Y&((A>>8)+1)) << 8) | (A & 0xff); WrMem(A,A>>8); break;
}
/* SXA */
case 0x9E: ST_ABY(_X&(((A-_Y)>>8)+1));
case 0x9E: /* Can't reuse existing ST_ABI macro here, due to addressing weirdness. */
{
unsigned int A; GetABIWR(A,_Y); A = ((_X&((A>>8)+1)) << 8) | (A & 0xff); WrMem(A,A>>8); break;
}
/* XAS */
case 0x9B: _S=_A&_X;ST_ABY(_S& (((A-_Y)>>8)+1) );