Apple-2-Tools/bradgrantham-apple2e
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CMP abs,Y

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This commit is contained in:
Brad Grantham 2016-11-06 13:30:23 -08:00
parent f9dbf8a704
commit 2b3874879e
1 changed files with 11 additions and 0 deletions
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11
apple2e.cpp
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@ -502,6 +502,17 @@ struct CPU6502
break;
}
case 0xD9: {
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
if(debug & DEBUG_DECODE) printf("CMP %04X, Y\n", addr);
unsigned char m = bus.read(addr + y);
flag_change(C, m <= a);
m = a - m;
flag_change(N, m & 0x80);
flag_change(Z, m == 0);
break;
}
case 0xB9: {
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
if(debug & DEBUG_DECODE) printf("LDA %04X, Y\n", addr);