Apple-2-Tools/bradgrantham-apple2e
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SPKR, EOR, LDY zpg

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This commit is contained in:
Brad Grantham 2016-11-06 12:44:32 -08:00
parent 8b8c526679
commit f50ef091a5
1 changed files with 29 additions and 0 deletions
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29
apple2e.cpp
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@ -143,6 +143,12 @@ struct MAINboard : board_base
data = 0x00;
return true;
}
if(addr == 0xC030) {
printf("read SPKR, force 0x00\n");
// click
data = 0x00;
return true;
}
if(addr == 0xC010) {
printf("read KBDSTRB, force 0x00\n");
// reset keyboard latch
@ -199,6 +205,11 @@ struct MAINboard : board_base
// reset keyboard latch
return true;
}
if(addr == 0xC030) {
printf("write SPKR\n");
// click
return true;
}
printf("unhandled MMIO Write at %04X\n", addr);
exit(0);
}
@ -627,6 +638,15 @@ struct CPU6502
break;
}
case 0xA4: {
unsigned char zpg = read_pc_inc(bus);
if(debug & DEBUG_DECODE) printf("LDY %02X\n", zpg);
y = bus.read(zpg);
flag_change(N, y & 0x80);
flag_change(Z, y == 0);
break;
}
case 0xAC: {
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
if(debug & DEBUG_DECODE) printf("LDY %04X\n", addr);
@ -682,6 +702,15 @@ struct CPU6502
break;
}
case 0x49: {
unsigned char imm = read_pc_inc(bus);
if(debug & DEBUG_DECODE) printf("EOR #%02X\n", imm);
a = a ^ imm;
flag_change(N, a & 0x80);
flag_change(Z, a == 0);
break;
}
case 0xC9: {
unsigned char imm = read_pc_inc(bus);
if(debug & DEBUG_DECODE) printf("CMP #%02X\n", imm);