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https://github.com/MoleskiCoder/EightBit.git
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Correct a 6502 bug in absolute indirect addressing mode (unchanging page on address resolution).
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
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@ -75,6 +75,7 @@ namespace EightBit {
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adjustNegative(datum);
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}
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void getWord(uint8_t page, uint8_t offset, register16_t& output);
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void getWord(uint8_t offset, register16_t& output);
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void getWord(register16_t& output);
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@ -104,7 +105,7 @@ namespace EightBit {
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void Address_Indirect() {
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Address_Absolute();
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getWord(MEMPTR(), MEMPTR());
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getWord(MEMPTR().high, MEMPTR().low, MEMPTR());
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}
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void Address_ZeroPageX() {
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@ -63,14 +63,18 @@ void EightBit::MOS6502::reset() {
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getWord(RSTvector, PC());
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}
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void EightBit::MOS6502::getWord(uint8_t offset, register16_t& output) {
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void EightBit::MOS6502::getWord(uint8_t page, uint8_t offset, register16_t& output) {
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BUS().ADDRESS().low = offset;
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BUS().ADDRESS().high = 0;
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BUS().ADDRESS().high = page;
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output.low = getByte();
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BUS().ADDRESS().low++;
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output.high = getByte();
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}
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void EightBit::MOS6502::getWord(uint8_t offset, register16_t& output) {
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getWord(0, offset, output);
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}
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void EightBit::MOS6502::getWord(register16_t& output) {
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output.low = getByte();
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BUS().ADDRESS().word++;
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