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games/snes: fixed decimal mode

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This commit is contained in:
aiju 2014-03-21 13:57:25 +01:00
parent 24bb136c85
commit 52cb2d472b
1 changed files with 8 additions and 4 deletions
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12
sys/src/games/snes/cpu.c
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@ -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);