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Add StackPointer to memory, PHA, PLA, PHP, PLP

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scawful
2023-08-19 15:59:17 -04:00
parent de93f71d04
commit 76f40531f1
6 changed files with 447 additions and 185 deletions
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54
src/app/emu/cpu.cc
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@@ -65,60 +65,6 @@ uint8_t CPU::FetchByteDirectPage(uint8_t operand) {
return fetchedByte;
}
uint16_t CPU::DirectPageIndexedIndirectX() {
uint8_t dp = FetchByte();
return memory.ReadWord((dp + X) & 0xFF);
}
uint16_t CPU::StackRelative() {
uint8_t sr = FetchByte();
return SP + sr;
}
uint16_t CPU::DirectPage() { return FetchByte(); }
uint16_t CPU::DirectPageIndirectLong() {
uint8_t dp = FetchByte();
return memory.ReadWordLong(dp);
}
uint16_t CPU::Immediate() { return PC++; }
uint16_t CPU::Absolute() { return FetchWord(); }
uint16_t CPU::AbsoluteLong() { return FetchLong(); }
uint16_t CPU::DirectPageIndirectIndexedY() {
uint8_t dp = FetchByte();
return memory.ReadWord(dp) + Y;
}
uint16_t CPU::DirectPageIndirect() {
uint8_t dp = FetchByte();
return memory.ReadWord(dp);
}
uint16_t CPU::StackRelativeIndirectIndexedY() {
uint8_t sr = FetchByte();
return memory.ReadWord(SP + sr) + Y;
}
uint16_t CPU::DirectPageIndexedX() {
uint8_t dp = FetchByte();
return (dp + X) & 0xFF;
}
uint16_t CPU::DirectPageIndirectLongIndexedY() {
uint8_t dp = FetchByte();
return memory.ReadWordLong(dp) + Y;
}
uint16_t CPU::AbsoluteIndexedY() { return FetchWord() + Y; }
uint16_t CPU::AbsoluteIndexedX() { return FetchWord() + X; }
uint16_t CPU::AbsoluteLongIndexedX() { return FetchLong() + X; }
void CPU::ExecuteInstruction(uint8_t opcode) {
// uint8_t opcode = FetchByte();
uint8_t operand = -1;