diff options
| author | aiju <devnull@localhost> | 2014-03-21 13:57:25 +0100 |
|---|---|---|
| committer | aiju <devnull@localhost> | 2014-03-21 13:57:25 +0100 |
| commit | 52cb2d472b040bf057f49369a86e0ca4bffa88c6 (patch) | |
| tree | 10e229ca2d0384bfe846829ff4971d9a115a8433 /sys/src | |
| parent | 24bb136c8585cc82374607f576f3858f610c37f9 (diff) | |
games/snes: fixed decimal mode
Diffstat (limited to 'sys/src')
| -rw-r--r-- | sys/src/games/snes/cpu.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/sys/src/games/snes/cpu.c b/sys/src/games/snes/cpu.c index f307028c7..cea3c1d91 100644 --- a/sys/src/games/snes/cpu.c +++ b/sys/src/games/snes/cpu.c @@ -357,11 +357,11 @@ adc(u16int a) if(r > 0x0009) r += 0x0006; if(r > 0x001f) r -= 0x0010; r += (rA & 0x00f0) + (a & 0x00f0); - if(r > 0x0090) r += 0x0060; - if(r > 0x01f0) r -= 0x0100; + if(r > 0x009f) r += 0x0060; + if(r > 0x01ff) r -= 0x0100; r += (rA & 0x0f00) + (a & 0x0f00); - if(r > 0x0900) r += 0x0600; - if(r > 0x1f00) r -= 0x1000; + if(r > 0x09ff) r += 0x0600; + if(r > 0x1fff) r -= 0x1000; r += (rA & 0xf000) + (a & 0xf000); }else r = rA + a + (rP & FLAGC); @@ -505,6 +505,7 @@ sbc(u16int a) if((rP & FLAGD) != 0){ r = (rA & 0xf) + (a & 0xf) + (rP & FLAGC); if(r < 0x10) r -= 0x06; + if(r < 0) r += 0x10; r += (rA & 0xf0) + (a & 0xf0); }else r = (rA & 0xff) + a + (rP & FLAGC); @@ -525,10 +526,13 @@ sbc(u16int a) if((rP & FLAGD) != 0){ r = (rA & 0x000f) + (a & 0x000f) + (rP & FLAGC); if(r < 0x0010) r -= 0x0006; + if(r < 0x0000) r += 0x0010; r += (rA & 0x00f0) + (a & 0x00f0); if(r < 0x0100) r -= 0x0060; + if(r < 0x0000) r += 0x0100; r += (rA & 0x0f00) + (a & 0x0f00); if(r < 0x1000) r -= 0x0600; + if(r < 0x0000) r += 0x1000; r += (rA & 0xf000) + (a & 0xf000); }else r = rA + a + (rP & FLAGC); |