Move CPU instruction impl to source file
This commit is contained in:
scawful
@@ -372,662 +372,274 @@ class CPU : public Memory, public Loggable {
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void AND(uint16_t address, bool isImmediate = false);
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// ASL: Arithmetic shift left
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void ASL(uint16_t address) {
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uint8_t value = memory.ReadByte(address);
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SetCarryFlag(!(value & 0x80)); // Set carry flag if bit 7 is set
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value <<= 1; // Shift left
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value &= 0xFE; // Clear bit 0
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memory.WriteByte(address, value);
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SetNegativeFlag(!value);
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SetZeroFlag(value);
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}
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void ASL(uint16_t address);
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// BCC: Branch if carry clear
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void BCC(int8_t offset) {
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if (!GetCarryFlag()) { // If the carry flag is clear
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PC += offset; // Add the offset to the program counter
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}
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}
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void BCC(int8_t offset);
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// BCS: Branch if carry set
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void BCS(int8_t offset) {
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if (GetCarryFlag()) { // If the carry flag is set
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PC += offset; // Add the offset to the program counter
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}
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}
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void BCS(int8_t offset);
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// BEQ: Branch if equal (zero set)
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void BEQ(int8_t offset) {
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if (GetZeroFlag()) { // If the zero flag is set
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PC += offset; // Add the offset to the program counter
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}
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}
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// BEQ: Branch if equal
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void BEQ(int8_t offset);
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// BIT: Bit test
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void BIT(uint16_t address) {
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uint8_t value = memory.ReadByte(address);
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SetNegativeFlag(value & 0x80);
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SetOverflowFlag(value & 0x40);
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SetZeroFlag((A & value) == 0);
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}
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void BIT(uint16_t address);
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// BMI: Branch if minus (negative set)
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void BMI(int8_t offset) {
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if (GetNegativeFlag()) { // If the negative flag is set
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PC += offset; // Add the offset to the program counter
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}
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}
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// BMI: Branch if minus
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void BMI(int8_t offset);
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// BNE: Branch if not equal (zero clear)
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void BNE(int8_t offset) {
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if (!GetZeroFlag()) { // If the zero flag is clear
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PC += offset; // Add the offset to the program counter
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}
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}
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// BNE: Branch if not equal
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void BNE(int8_t offset);
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// BPL: Branch if plus (negative clear)
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void BPL(int8_t offset) {
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if (!GetNegativeFlag()) { // If the negative flag is clear
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PC += offset; // Add the offset to the program counter
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}
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}
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// BPL: Branch if plus
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void BPL(int8_t offset);
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// BRA: Branch always
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void BRA(int8_t offset) { PC += offset; }
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void BRA(int8_t offset);
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// BRK: Break
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void BRK() {
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PC += 2; // Increment the program counter by 2
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memory.PushWord(PC);
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memory.PushByte(status);
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SetInterruptFlag(true);
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try {
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PC = memory.ReadWord(0xFFFE);
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} catch (const std::exception& e) {
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std::cout << "BRK: " << e.what() << std::endl;
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}
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}
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// BRK: Force interrupt
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void BRK();
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// BRL: Branch always long
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void BRL(int16_t offset) {
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PC += offset; // Add the offset to the program counter
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}
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void BRL(int16_t offset);
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// BVC: Branch if overflow clear
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void BVC(int8_t offset) {
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if (!GetOverflowFlag()) { // If the overflow flag is clear
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PC += offset; // Add the offset to the program counter
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}
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}
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void BVC(int8_t offset);
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// BVS: Branch if overflow set
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void BVS(int8_t offset) {
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if (GetOverflowFlag()) { // If the overflow flag is set
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PC += offset; // Add the offset to the program counter
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}
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}
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void BVS(int8_t offset);
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// CLC: Clear carry flag
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void CLC() { status &= ~0x01; }
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void CLC();
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// CLD: Clear decimal mode
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void CLD() { status &= ~0x08; }
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void CLD();
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// CLI: Clear interrupt disable flag
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void CLI() { status &= ~0x04; }
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// CLI: Clear interrupt disable bit
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void CLI();
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// CLV: Clear overflow flag
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void CLV() { status &= ~0x40; }
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void CLV();
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// CMP: Compare TESTME
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// n Set if MSB of result is set; else cleared
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// z Set if result is zero; else cleared
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// c Set if no borrow; else cleared
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void CMP(uint8_t value, bool isImmediate = false) {
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if (GetAccumulatorSize()) { // 8-bit
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uint8_t result = isImmediate ? A - value : A - memory.ReadByte(value);
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SetZeroFlag(result == 0);
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SetNegativeFlag(result & 0x80);
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SetCarryFlag(A >= value);
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} else { // 16-bit
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uint16_t result = isImmediate ? A - value : A - memory.ReadWord(value);
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SetZeroFlag(result == 0);
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SetNegativeFlag(result & 0x8000);
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SetCarryFlag(A >= value);
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}
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}
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// CMP: Compare
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void CMP(uint16_t address, bool isImmediate = false);
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// COP: Coprocessor TESTME
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void COP() {
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PC += 2; // Increment the program counter by 2
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memory.PushWord(PC);
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memory.PushByte(status);
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SetInterruptFlag(true);
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if (E) {
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PC = memory.ReadWord(0xFFF4);
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} else {
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PC = memory.ReadWord(0xFFE4);
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}
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SetDecimalFlag(false);
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}
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// COP: Coprocessor enable
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void COP();
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// CPX: Compare X register
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void CPX(uint16_t value, bool isImmediate = false) {
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if (GetIndexSize()) { // 8-bit
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uint8_t memory_value = isImmediate ? value : memory.ReadByte(value);
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compare(X, memory_value);
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} else { // 16-bit
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uint16_t memory_value = isImmediate ? value : memory.ReadWord(value);
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compare(X, memory_value);
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}
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}
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void CPX(uint16_t address, bool isImmediate = false);
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// CPY: Compare Y register
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void CPY(uint16_t value, bool isImmediate = false) {
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if (GetIndexSize()) { // 8-bit
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uint8_t memory_value = isImmediate ? value : memory.ReadByte(value);
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compare(Y, memory_value);
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} else { // 16-bit
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uint16_t memory_value = isImmediate ? value : memory.ReadWord(value);
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compare(Y, memory_value);
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}
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}
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void CPY(uint16_t address, bool isImmediate = false);
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// DEC: Decrement TESTME
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void DEC(uint16_t address) {
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if (GetAccumulatorSize()) {
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uint8_t value = memory.ReadByte(address);
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value--;
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memory.WriteByte(address, value);
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SetZeroFlag(value == 0);
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SetNegativeFlag(value & 0x80);
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} else {
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uint16_t value = memory.ReadWord(address);
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value--;
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memory.WriteWord(address, value);
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SetZeroFlag(value == 0);
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SetNegativeFlag(value & 0x8000);
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}
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}
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// DEC: Decrement memory
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void DEC(uint16_t address);
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// DEX: Decrement X register
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void DEX() {
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if (GetIndexSize()) { // 8-bit
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X = static_cast<uint8_t>(X - 1);
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SetZeroFlag(X == 0);
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SetNegativeFlag(X & 0x80);
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} else { // 16-bit
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X = static_cast<uint16_t>(X - 1);
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SetZeroFlag(X == 0);
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SetNegativeFlag(X & 0x8000);
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}
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}
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void DEX();
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// DEY: Decrement Y register
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void DEY() {
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if (GetIndexSize()) { // 8-bit
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Y = static_cast<uint8_t>(Y - 1);
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SetZeroFlag(Y == 0);
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SetNegativeFlag(Y & 0x80);
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} else { // 16-bit
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Y = static_cast<uint16_t>(Y - 1);
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SetZeroFlag(Y == 0);
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SetNegativeFlag(Y & 0x8000);
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}
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}
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void DEY();
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// EOR: Exclusive OR TESTMEs
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void EOR(uint16_t address, bool isImmediate = false) {
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if (GetAccumulatorSize()) {
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A ^= isImmediate ? address : memory.ReadByte(address);
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SetZeroFlag(A == 0);
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SetNegativeFlag(A & 0x80);
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} else {
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A ^= isImmediate ? address : memory.ReadWord(address);
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SetZeroFlag(A == 0);
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SetNegativeFlag(A & 0x8000);
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}
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}
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// EOR: Exclusive OR
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void EOR(uint16_t address, bool isImmediate = false);
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// INC: Increment
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void INC(uint16_t address) {
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if (GetAccumulatorSize()) {
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uint8_t value = memory.ReadByte(address);
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value++;
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memory.WriteByte(address, value);
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SetNegativeFlag(value & 0x80);
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SetZeroFlag(value == 0);
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} else {
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uint16_t value = memory.ReadWord(address);
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value++;
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memory.WriteWord(address, value);
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SetNegativeFlag(value & 0x8000);
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SetZeroFlag(value == 0);
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}
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}
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// INC: Increment memory
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void INC(uint16_t address);
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// INX: Increment X register
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void INX() {
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if (GetIndexSize()) { // 8-bit
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X = static_cast<uint8_t>(X + 1);
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SetZeroFlag(X == 0);
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SetNegativeFlag(X & 0x80);
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} else { // 16-bit
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X = static_cast<uint16_t>(X + 1);
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SetZeroFlag(X == 0);
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SetNegativeFlag(X & 0x8000);
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}
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}
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void INX();
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// INY: Increment Y register
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void INY() {
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if (GetIndexSize()) { // 8-bit
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Y = static_cast<uint8_t>(Y + 1);
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SetZeroFlag(Y == 0);
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SetNegativeFlag(Y & 0x80);
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} else { // 16-bit
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Y = static_cast<uint16_t>(Y + 1);
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SetZeroFlag(Y == 0);
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SetNegativeFlag(Y & 0x8000);
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}
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}
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void INY();
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// JMP: Jump
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void JMP(uint16_t address) {
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PC = address; // Set program counter to the new address
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}
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void JMP(uint16_t address);
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// JML: Jump long
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void JML(uint32_t address) {
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// Set the lower 16 bits of PC to the lower 16 bits of the address
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PC = static_cast<uint8_t>(address & 0xFFFF);
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// Set the PBR to the upper 8 bits of the address
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PB = static_cast<uint8_t>((address >> 16) & 0xFF);
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}
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void JML(uint32_t address);
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// JSR: Jump to subroutine
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void JSR(uint16_t address) {
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PC -= 1; // Subtract 1 from program counter
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memory.PushWord(PC); // Push the program counter onto the stack
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PC = address; // Set program counter to the new address
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}
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void JSR(uint16_t address);
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// JSL: Jump to subroutine long
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void JSL(uint32_t address) {
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PC -= 1; // Subtract 1 from program counter
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memory.PushLong(PC); // Push the program counter onto the stack as a long
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// value (24 bits)
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PC = address; // Set program counter to the new address
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}
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void JSL(uint32_t address);
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// LDA: Load accumulator
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void LDA(uint16_t address, bool isImmediate = false) {
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if (GetAccumulatorSize()) {
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A = isImmediate ? address : memory.ReadByte(address);
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SetZeroFlag(A == 0);
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SetNegativeFlag(A & 0x80);
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} else {
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A = isImmediate ? memory.ReadWord(PC) : memory.ReadWord(address);
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SetZeroFlag(A == 0);
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SetNegativeFlag(A & 0x8000);
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}
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}
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void LDA(uint16_t address, bool isImmediate = false);
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// LDX: Load X register
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void LDX(uint16_t address, bool isImmediate = false) {
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if (GetIndexSize()) {
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X = isImmediate ? address : memory.ReadByte(address);
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SetZeroFlag(X == 0);
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SetNegativeFlag(X & 0x80);
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} else {
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X = isImmediate ? address : memory.ReadWord(address);
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SetZeroFlag(X == 0);
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SetNegativeFlag(X & 0x8000);
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}
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}
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void LDX(uint16_t address, bool isImmediate = false);
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// LDY: Load Y register
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void LDY(uint16_t address, bool isImmediate = false) {
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if (GetIndexSize()) {
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Y = isImmediate ? address : memory.ReadByte(address);
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SetZeroFlag(Y == 0);
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SetNegativeFlag(Y & 0x80);
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} else {
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Y = isImmediate ? address : memory.ReadWord(address);
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SetZeroFlag(Y == 0);
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SetNegativeFlag(Y & 0x8000);
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}
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}
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void LDY(uint16_t address, bool isImmediate = false);
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// LSR: Logical shift right
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void LSR(uint16_t address) {
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uint8_t value = memory.ReadByte(address);
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SetCarryFlag(value & 0x01);
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value >>= 1;
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memory.WriteByte(address, value);
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SetNegativeFlag(false);
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SetZeroFlag(value == 0);
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}
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void LSR(uint16_t address);
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// MVN: Move negative ```
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// MVP: Move positive ```
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// MVN: Block move next
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void MVN(uint16_t source, uint16_t dest, uint16_t length);
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// MVP: Block move previous
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void MVP(uint16_t source, uint16_t dest, uint16_t length);
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// NOP: No operation
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void NOP() {
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// Do nothing
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}
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void NOP();
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// ORA: Logical OR
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void ORA(uint16_t address, bool isImmediate = false) {
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if (GetAccumulatorSize()) {
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A |= isImmediate ? address : memory.ReadByte(address);
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SetZeroFlag(A == 0);
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SetNegativeFlag(A & 0x80);
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} else {
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A |= isImmediate ? address : memory.ReadWord(address);
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SetZeroFlag(A == 0);
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SetNegativeFlag(A & 0x8000);
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}
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}
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// ORA: Logical inclusive OR
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void ORA(uint16_t address, bool isImmediate = false);
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// PEA: Push effective address
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void PEA() {
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uint16_t address = FetchWord();
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memory.PushWord(address);
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}
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// PEA: Push effective absolute address
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void PEA(uint16_t address);
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// PEI: Push effective indirect address
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void PEI() {
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uint16_t address = FetchWord();
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memory.PushWord(memory.ReadWord(address));
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}
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void PEI(uint16_t address);
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// PER: Push effective PC-relative address
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void PER() {
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uint16_t address = FetchWord();
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memory.PushWord(PC + address);
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}
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// PER: Push effective relative address
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void PER(uint16_t address);
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// PHA: Push Accumulator on Stack
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void PHA() { memory.PushByte(A); }
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// PHA: Push accumulator
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void PHA();
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// PHB: Push Data Bank Register on Stack
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void PHB() { memory.PushByte(DB); }
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// PHB: Push data bank register
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void PHB();
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// PHD: Push Program Bank Register on Stack
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void PHD() { memory.PushWord(D); }
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// PHD: Push direct page register
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void PHD();
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// PHK: Push Program Bank Register on Stack
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void PHK() { memory.PushByte(PB); }
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// PHK: Push program bank register
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void PHK();
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// PHP: Push Processor Status Register on Stack
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void PHP() { memory.PushByte(status); }
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// PHP: Push processor status (flags)
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void PHP();
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// PHX: Push X Index Register on Stack
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void PHX() { memory.PushByte(X); }
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// PHX: Push X register
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void PHX();
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// PHY: Push Y Index Register on Stack
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void PHY() { memory.PushByte(Y); }
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// PHY: Push Y register
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void PHY();
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// PLA: Pull Accumulator from Stack
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void PLA() {
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A = memory.PopByte();
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SetNegativeFlag((A & 0x80) != 0);
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SetZeroFlag(A == 0);
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}
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// PLA: Pull accumulator
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void PLA();
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// PLB: Pull data bank register
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void PLB() {
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DB = memory.PopByte();
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SetNegativeFlag((DB & 0x80) != 0);
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SetZeroFlag(DB == 0);
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}
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void PLB();
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// Pull Direct Page Register from Stack
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void PLD() {
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D = memory.PopWord();
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SetNegativeFlag((D & 0x8000) != 0);
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SetZeroFlag(D == 0);
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}
|
||||
// PLD: Pull direct page register
|
||||
void PLD();
|
||||
|
||||
// Pull Processor Status Register from Stack
|
||||
void PLP() { status = memory.PopByte(); }
|
||||
// PLP: Pull processor status (flags)
|
||||
void PLP();
|
||||
|
||||
// PLX: Pull X Index Register from Stack
|
||||
void PLX() {
|
||||
X = memory.PopByte();
|
||||
SetNegativeFlag((A & 0x80) != 0);
|
||||
SetZeroFlag(X == 0);
|
||||
}
|
||||
// PLX: Pull X register
|
||||
void PLX();
|
||||
|
||||
// PHY: Pull Y Index Register from Stack
|
||||
void PLY() {
|
||||
Y = memory.PopByte();
|
||||
SetNegativeFlag((A & 0x80) != 0);
|
||||
SetZeroFlag(Y == 0);
|
||||
}
|
||||
// PLY: Pull Y register
|
||||
void PLY();
|
||||
|
||||
// REP: Reset status bits
|
||||
void REP() {
|
||||
auto byte = FetchByte();
|
||||
status &= ~byte;
|
||||
}
|
||||
// REP: Reset processor status bits
|
||||
void REP();
|
||||
|
||||
// ROL: Rotate left
|
||||
void ROL(uint16_t address) {
|
||||
uint8_t value = memory.ReadByte(address);
|
||||
uint8_t carry = GetCarryFlag() ? 0x01 : 0x00;
|
||||
SetCarryFlag(value & 0x80);
|
||||
value <<= 1;
|
||||
value |= carry;
|
||||
memory.WriteByte(address, value);
|
||||
SetNegativeFlag(value & 0x80);
|
||||
SetZeroFlag(value == 0);
|
||||
}
|
||||
void ROL(uint16_t address);
|
||||
|
||||
// ROR: Rotate right
|
||||
void ROR(uint16_t address) {
|
||||
uint8_t value = memory.ReadByte(address);
|
||||
uint8_t carry = GetCarryFlag() ? 0x80 : 0x00;
|
||||
SetCarryFlag(value & 0x01);
|
||||
value >>= 1;
|
||||
value |= carry;
|
||||
memory.WriteByte(address, value);
|
||||
SetNegativeFlag(value & 0x80);
|
||||
SetZeroFlag(value == 0);
|
||||
}
|
||||
void ROR(uint16_t address);
|
||||
|
||||
// RTI: Return from interrupt
|
||||
void RTI() {
|
||||
status = memory.PopByte();
|
||||
PC = memory.PopWord();
|
||||
}
|
||||
void RTI();
|
||||
|
||||
// RTL: Return from subroutine long
|
||||
void RTL() {
|
||||
PC = memory.PopWord();
|
||||
PB = memory.PopByte();
|
||||
}
|
||||
void RTL();
|
||||
|
||||
// RTS: Return from subroutine
|
||||
void RTS() { PC = memory.PopWord() + 1; }
|
||||
void RTS();
|
||||
|
||||
// SBC: Subtract with carry
|
||||
void SBC(uint16_t operand, bool isImmediate = false);
|
||||
|
||||
// SEC: Set carry flag
|
||||
void SEC() { status |= 0x01; }
|
||||
void SEC();
|
||||
|
||||
// SED: Set decimal mode
|
||||
void SED() { status |= 0x08; }
|
||||
void SED();
|
||||
|
||||
// SEI: Set interrupt disable flag
|
||||
void SEI() { status |= 0x04; }
|
||||
// SEI: Set interrupt disable status
|
||||
void SEI();
|
||||
|
||||
// SEP: Set status bits
|
||||
void SEP() {
|
||||
auto byte = FetchByte();
|
||||
status |= byte;
|
||||
}
|
||||
// SEP: Set processor status bits
|
||||
void SEP();
|
||||
|
||||
// STA: Store accumulator
|
||||
void STA(uint16_t address) {
|
||||
if (GetAccumulatorSize()) {
|
||||
memory.WriteByte(address, static_cast<uint8_t>(A));
|
||||
} else {
|
||||
memory.WriteWord(address, A);
|
||||
}
|
||||
}
|
||||
void STA(uint16_t address);
|
||||
|
||||
// TODO: Make this work with the Clock class of the CPU
|
||||
// STP: Stop the clock
|
||||
void STP() {
|
||||
// During the next phase 2 clock cycle, stop the processors oscillator input
|
||||
// The processor is effectively shut down until a reset occurs (RES` pin).
|
||||
}
|
||||
// STP: Stop the processor
|
||||
void STP();
|
||||
|
||||
// STX: Store X register
|
||||
void STX(uint16_t address) {
|
||||
if (GetIndexSize()) {
|
||||
memory.WriteByte(address, static_cast<uint8_t>(X));
|
||||
} else {
|
||||
memory.WriteWord(address, X);
|
||||
}
|
||||
}
|
||||
void STX(uint16_t address);
|
||||
|
||||
// STY: Store Y register
|
||||
void STY(uint16_t address) {
|
||||
if (GetIndexSize()) {
|
||||
memory.WriteByte(address, static_cast<uint8_t>(Y));
|
||||
} else {
|
||||
memory.WriteWord(address, Y);
|
||||
}
|
||||
}
|
||||
void STY(uint16_t address);
|
||||
|
||||
// STZ: Store zero
|
||||
void STZ(uint16_t address) {
|
||||
if (GetAccumulatorSize()) {
|
||||
memory.WriteByte(address, 0x00);
|
||||
} else {
|
||||
memory.WriteWord(address, 0x0000);
|
||||
}
|
||||
}
|
||||
void STZ(uint16_t address);
|
||||
|
||||
// TAX: Transfer accumulator to X
|
||||
void TAX() {
|
||||
X = A;
|
||||
SetZeroFlag(X == 0);
|
||||
SetNegativeFlag(X & 0x80);
|
||||
}
|
||||
void TAX();
|
||||
|
||||
// TAY: Transfer accumulator to Y
|
||||
void TAY() {
|
||||
Y = A;
|
||||
SetZeroFlag(Y == 0);
|
||||
SetNegativeFlag(Y & 0x80);
|
||||
}
|
||||
void TAY();
|
||||
|
||||
// TCD: Transfer accumulator to direct page register
|
||||
void TCD() {
|
||||
D = A;
|
||||
SetZeroFlag(D == 0);
|
||||
SetNegativeFlag(D & 0x80);
|
||||
}
|
||||
// TCD: Transfer 16-bit accumulator to direct page register
|
||||
void TCD();
|
||||
|
||||
// TCS: Transfer accumulator to stack pointer
|
||||
void TCS() { memory.SetSP(A); }
|
||||
// TCS: Transfer 16-bit accumulator to stack pointer
|
||||
void TCS();
|
||||
|
||||
// TDC: Transfer direct page register to accumulator
|
||||
void TDC() {
|
||||
A = D;
|
||||
SetZeroFlag(A == 0);
|
||||
SetNegativeFlag(A & 0x80);
|
||||
}
|
||||
// TDC: Transfer direct page register to 16-bit accumulator
|
||||
void TDC();
|
||||
|
||||
// TRB: Test and reset bits
|
||||
void TRB(uint16_t address) {
|
||||
uint8_t value = memory.ReadByte(address);
|
||||
SetZeroFlag((A & value) == 0);
|
||||
value &= ~A;
|
||||
memory.WriteByte(address, value);
|
||||
}
|
||||
void TRB(uint16_t address);
|
||||
|
||||
// TSB: Test and set bits
|
||||
void TSB(uint16_t address) {
|
||||
uint8_t value = memory.ReadByte(address);
|
||||
SetZeroFlag((A & value) == 0);
|
||||
value |= A;
|
||||
memory.WriteByte(address, value);
|
||||
}
|
||||
void TSB(uint16_t address);
|
||||
|
||||
// TSC: Transfer stack pointer to accumulator
|
||||
void TSC() {
|
||||
A = SP();
|
||||
SetZeroFlag(A == 0);
|
||||
SetNegativeFlag(A & 0x80);
|
||||
}
|
||||
// TSC: Transfer stack pointer to 16-bit accumulator
|
||||
void TSC();
|
||||
|
||||
// TSX: Transfer stack pointer to X
|
||||
void TSX() {
|
||||
X = SP();
|
||||
SetZeroFlag(X == 0);
|
||||
SetNegativeFlag(X & 0x80);
|
||||
}
|
||||
void TSX();
|
||||
|
||||
// TXA: Transfer X to accumulator
|
||||
void TXA() {
|
||||
A = X;
|
||||
SetZeroFlag(A == 0);
|
||||
SetNegativeFlag(A & 0x80);
|
||||
}
|
||||
void TXA();
|
||||
|
||||
// TXS: Transfer X to stack pointer
|
||||
void TXS() { memory.SetSP(X); }
|
||||
void TXS();
|
||||
|
||||
// TXY: Transfer X to Y
|
||||
void TXY() {
|
||||
X = Y;
|
||||
SetZeroFlag(X == 0);
|
||||
SetNegativeFlag(X & 0x80);
|
||||
}
|
||||
void TXY();
|
||||
|
||||
// TYA: Transfer Y to accumulator
|
||||
void TYA() {
|
||||
A = Y;
|
||||
SetZeroFlag(A == 0);
|
||||
SetNegativeFlag(A & 0x80);
|
||||
}
|
||||
void TYA();
|
||||
|
||||
// TYX: Transfer Y to X
|
||||
void TYX() {
|
||||
Y = X;
|
||||
SetZeroFlag(Y == 0);
|
||||
SetNegativeFlag(Y & 0x80);
|
||||
}
|
||||
void TYX();
|
||||
|
||||
// TODO: Make this communicate with the SNES class
|
||||
// WAI: Wait for interrupt TESTME
|
||||
void WAI() {
|
||||
// Pull the RDY pin low
|
||||
// Power consumption is reduced(?)
|
||||
// RDY remains low until an external hardware interupt
|
||||
// (NMI, IRQ, ABORT, or RESET) is received from the SNES class
|
||||
}
|
||||
// WAI: Wait for interrupt
|
||||
void WAI();
|
||||
|
||||
// XBA: Exchange B and A accumulator
|
||||
void XBA() {
|
||||
uint8_t lowByte = A & 0xFF;
|
||||
uint8_t highByte = (A >> 8) & 0xFF;
|
||||
A = (lowByte << 8) | highByte;
|
||||
}
|
||||
// WDM: Reserved for future expansion
|
||||
void WDM();
|
||||
|
||||
// XCE: Exchange Carry and Emulation Flags
|
||||
void XCE() {
|
||||
uint8_t carry = status & 0x01;
|
||||
status &= ~0x01;
|
||||
status |= E;
|
||||
E = carry;
|
||||
}
|
||||
// XBA: Exchange B and A
|
||||
void XBA();
|
||||
|
||||
// XCE: Exchange carry and emulation bits
|
||||
void XCE();
|
||||
|
||||
uint8_t ReadByte(uint16_t address) const override;
|
||||
uint16_t ReadWord(uint16_t address) const override;
|
||||
|
||||
Reference in New Issue
Block a user