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I think this fixes one of my NES issues. The fix-up required for the PC is handled by the fetchByte associated with the BRK instruction.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
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Adrian Conlon
2019-01-07 01:28:23 +00:00
parent 741e005e0c
commit 3faec680b0
1 changed files with 3 additions and 3 deletions
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6
M6502/src/mos6502.cpp
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@@ -58,13 +58,13 @@ void EightBit::MOS6502::handleRESET() {
void EightBit::MOS6502::handleNMI() { void EightBit::MOS6502::handleNMI() {
raise(HALT()); raise(HALT());
interrupt(); Processor::execute(0);
raise(NMI()); raise(NMI());
} }
void EightBit::MOS6502::handleIRQ() { void EightBit::MOS6502::handleIRQ() {
raise(HALT()); raise(HALT());
interrupt(); Processor::execute(0);
raise(INT()); raise(INT());
} }
@@ -97,7 +97,7 @@ int EightBit::MOS6502::execute() {
switch (opcode()) { switch (opcode()) {
case 0x00: fetchByte(); interrupt(); break; // BRK (implied) case 0x00: fetchByte(); interrupt(); break; // BRK (implied)
case 0x01: A() = orr(A(), AM_IndexedIndirectX()); break; // ORA (indexed indirect X) case 0x01: A() = orr(A(), AM_IndexedIndirectX()); break; // ORA (indexed indirect X)
case 0x02: break; case 0x02: break;
case 0x03: slo(AM_IndexedIndirectX()); break; // *SLO (indexed indirect X) case 0x03: slo(AM_IndexedIndirectX()); break; // *SLO (indexed indirect X)