mirror of
https://github.com/MoleskiCoder/EightBit.git
synced 2025-01-11 02:29:50 +00:00
Reinstate operation timings (TBC)
Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian.Conlon
parent
3084d2341c
commit
d1bb49143d
@ -163,15 +163,19 @@ namespace EightBit {
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return m_memory.reference();
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}
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uint8_t& AM_AbsoluteX() {
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uint8_t& AM_AbsoluteX(bool read = true) {
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Address_AbsoluteX();
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m_memory.ADDRESS() = m_memptr;
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if (read && (m_memory.ADDRESS().low == 0xff))
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++cycles;
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return m_memory.reference();
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}
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uint8_t& AM_AbsoluteY() {
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uint8_t& AM_AbsoluteY(bool read = true) {
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Address_AbsoluteY();
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m_memory.ADDRESS() = m_memptr;
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if (read && (m_memory.ADDRESS().low == 0xff))
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++cycles;
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return m_memory.reference();
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}
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@ -193,9 +197,11 @@ namespace EightBit {
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return m_memory.reference();
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}
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uint8_t& AM_IndirectIndexedY() {
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uint8_t& AM_IndirectIndexedY(bool read = true) {
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Address_IndirectIndexedY();
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m_memory.ADDRESS() = m_memptr;
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if (read && (m_memory.ADDRESS().low == 0xff))
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++cycles;
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return m_memory.reference();
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}
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@ -203,7 +209,7 @@ namespace EightBit {
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#pragma region 6502 addressing mode switching
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uint8_t& AM_00(int bbb) {
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uint8_t& AM_00(int bbb, bool read = true) {
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switch (bbb) {
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case 0b000:
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return AM_Immediate();
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@ -214,7 +220,7 @@ namespace EightBit {
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case 0b101:
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return AM_ZeroPageX();
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case 0b111:
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return AM_AbsoluteX();
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return AM_AbsoluteX(read);
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case 0b010:
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case 0b100:
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case 0b110:
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@ -224,7 +230,7 @@ namespace EightBit {
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}
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}
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uint8_t& AM_01(int bbb) {
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uint8_t& AM_01(int bbb, bool read = true) {
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switch (bbb) {
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case 0b000:
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return AM_IndexedIndirectX();
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@ -235,19 +241,19 @@ namespace EightBit {
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case 0b011:
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return AM_Absolute();
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case 0b100:
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return AM_IndirectIndexedY();
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return AM_IndirectIndexedY(read);
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case 0b101:
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return AM_ZeroPageX();
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case 0b110:
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return AM_AbsoluteY();
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return AM_AbsoluteY(read);
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case 0b111:
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return AM_AbsoluteX();
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return AM_AbsoluteX(read);
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default:
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__assume(0);
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}
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}
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uint8_t& AM_10(int bbb) {
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uint8_t& AM_10(int bbb, bool read = true) {
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switch (bbb) {
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case 0b000:
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return AM_Immediate();
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@ -260,7 +266,7 @@ namespace EightBit {
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case 0b101:
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return AM_ZeroPageX();
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case 0b111:
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return AM_AbsoluteX();
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return AM_AbsoluteX(read);
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case 0b100:
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case 0b110:
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throw std::domain_error("Illegal addressing mode");
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@ -269,7 +275,7 @@ namespace EightBit {
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}
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}
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uint8_t& AM_10_x(int bbb) {
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uint8_t& AM_10_x(int bbb, bool read = true) {
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switch (bbb) {
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case 0b000:
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return AM_Immediate();
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@ -282,7 +288,7 @@ namespace EightBit {
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case 0b101:
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return AM_ZeroPageY();
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case 0b111:
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return AM_AbsoluteY();
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return AM_AbsoluteY(read);
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case 0b100:
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case 0b110:
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throw std::domain_error("Illegal addressing mode");
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@ -356,5 +362,7 @@ namespace EightBit {
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uint8_t p; // processor status
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register16_t m_memptr;
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std::array<int, 0x100> m_timings;
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};
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}
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@ -3,6 +3,25 @@
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EightBit::MOS6502::MOS6502(Memory& memory)
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: Processor(memory) {
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m_timings = {
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//// 0 1 2 3 4 5 6 7 8 9 A B C D E F
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/* 0 */ 7, 6, 0, 0, 0, 4, 5, 0, 3, 2, 2, 0, 0, 4, 6, 0,
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/* 1 */ 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0,
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/* 2 */ 6, 6, 0, 0, 3, 3, 5, 0, 4, 2, 2, 0, 4, 4, 6, 0,
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/* 3 */ 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0,
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/* 4 */ 6, 6, 0, 0, 0, 3, 5, 0, 3, 2, 2, 0, 3, 4, 6, 0,
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/* 5 */ 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0,
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/* 6 */ 6, 6, 0, 0, 0, 3, 5, 0, 4, 2, 2, 0, 5, 4, 6, 0,
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/* 7 */ 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0,
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/* 8 */ 0, 6, 0, 0, 3, 3, 3, 0, 2, 0, 2, 0, 4, 4, 4, 0,
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/* 9 */ 2, 6, 0, 0, 4, 4, 4, 0, 2, 5, 2, 0, 0, 5, 0, 0,
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/* A */ 2, 6, 2, 0, 3, 3, 3, 0, 2, 2, 2, 0, 4, 4, 4, 0,
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/* B */ 2, 5, 0, 0, 4, 4, 4, 0, 2, 4, 2, 0, 4, 4, 4, 0,
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/* C */ 2, 6, 0, 0, 3, 3, 5, 0, 2, 2, 2, 0, 4, 4, 6, 0,
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/* D */ 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0,
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/* E */ 2, 6, 0, 0, 3, 3, 5, 0, 2, 2, 2, 0, 4, 4, 6, 0,
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/* F */ 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0,
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};
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}
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void EightBit::MOS6502::initialise() {
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@ -61,7 +80,7 @@ void EightBit::MOS6502::Interrupt(uint16_t vector) {
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int EightBit::MOS6502::Execute(uint8_t cell) {
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cycles = 1;
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cycles = m_timings[cell];
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// http://www.llx.com/~nparker/a2/opcodes.html
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@ -110,7 +129,7 @@ int EightBit::MOS6502::Execute(uint8_t cell) {
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setFlag(P(), CF);
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break;
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default: // BIT
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BIT(AM_00(bbb));
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BIT(AM_00(bbb, false));
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break;
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}
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break;
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@ -168,7 +187,7 @@ int EightBit::MOS6502::Execute(uint8_t cell) {
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UpdateZeroNegativeFlags(A() = Y());
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break;
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default: // STY
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AM_00(bbb) = Y();
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AM_00(bbb, false) = Y();
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break;
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}
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break;
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@ -237,7 +256,7 @@ int EightBit::MOS6502::Execute(uint8_t cell) {
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ADC(AM_01(bbb));
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break;
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case 0b100: // STA
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AM_01(bbb) = A();
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AM_01(bbb, false) = A();
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break;
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case 0b101: // LDA
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LDA(AM_01(bbb));
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@ -255,16 +274,16 @@ int EightBit::MOS6502::Execute(uint8_t cell) {
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case 0b10:
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switch (aaa) {
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case 0b000: // ASL
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ASL(AM_10(bbb));
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ASL(AM_10(bbb, false));
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break;
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case 0b001: // ROL
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ROL(AM_10(bbb));
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ROL(AM_10(bbb, false));
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break;
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case 0b010: // LSR
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LSR(AM_10(bbb));
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LSR(AM_10(bbb, false));
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break;
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case 0b011: // ROR
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ROR(AM_10(bbb));
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ROR(AM_10(bbb, false));
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break;
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case 0b100:
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switch (bbb) {
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@ -275,7 +294,7 @@ int EightBit::MOS6502::Execute(uint8_t cell) {
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S() = X();
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break;
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default: // STX
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AM_10_x(bbb) = X();
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AM_10_x(bbb, false) = X();
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break;
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}
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break;
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@ -295,7 +314,7 @@ int EightBit::MOS6502::Execute(uint8_t cell) {
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DEC(X());
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break;
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default: // DEC
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DEC(AM_10(bbb));
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DEC(AM_10(bbb, false));
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break;
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}
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break;
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@ -304,7 +323,7 @@ int EightBit::MOS6502::Execute(uint8_t cell) {
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case 0b010: // NOP
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break;
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default: // INC
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INC(AM_10(bbb));
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INC(AM_10(bbb, false));
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break;
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}
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break;
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@ -510,7 +529,11 @@ void EightBit::MOS6502::ADC_d(uint8_t data) {
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////
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void EightBit::MOS6502::Branch(int8_t displacement) {
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auto page = PC().high;
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PC().word += displacement;
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if (PC().high != page)
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cycles++;
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cycles++;
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}
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void EightBit::MOS6502::Branch(bool flag) {
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