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mos6502.cpp
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mos6502.cpp
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#include "mos6502.h"
#define NEGATIVE 0x80
#define OVERFLOW 0x40
#define CONSTANT 0x20
#define BREAK 0x10
#define DECIMAL 0x08
#define INTERRUPT 0x04
#define ZERO 0x02
#define CARRY 0x01
#define SET_NEGATIVE(x) (x ? (status |= NEGATIVE) : (status &= (~NEGATIVE)) )
#define SET_OVERFLOW(x) (x ? (status |= OVERFLOW) : (status &= (~OVERFLOW)) )
//#define SET_CONSTANT(x) (x ? (status |= CONSTANT) : (status &= (~CONSTANT)) )
//#define SET_BREAK(x) (x ? (status |= BREAK) : (status &= (~BREAK)) )
#define SET_DECIMAL(x) (x ? (status |= DECIMAL) : (status &= (~DECIMAL)) )
#define SET_INTERRUPT(x) (x ? (status |= INTERRUPT) : (status &= (~INTERRUPT)) )
#define SET_ZERO(x) (x ? (status |= ZERO) : (status &= (~ZERO)) )
#define SET_CARRY(x) (x ? (status |= CARRY) : (status &= (~CARRY)) )
#define IF_NEGATIVE() ((status & NEGATIVE) ? true : false)
#define IF_OVERFLOW() ((status & OVERFLOW) ? true : false)
#define IF_CONSTANT() ((status & CONSTANT) ? true : false)
#define IF_BREAK() ((status & BREAK) ? true : false)
#define IF_DECIMAL() ((status & DECIMAL) ? true : false)
#define IF_INTERRUPT() ((status & INTERRUPT) ? true : false)
#define IF_ZERO() ((status & ZERO) ? true : false)
#define IF_CARRY() ((status & CARRY) ? true : false)
mos6502::Instr mos6502::InstrTable[256];
mos6502::mos6502(BusRead r, BusWrite w, ClockCycle c)
: reset_A(0x00)
, reset_X(0x00)
, reset_Y(0x00)
, reset_sp(0xFD)
, reset_status(CONSTANT)
{
Write = (BusWrite)w;
Read = (BusRead)r;
Cycle = (ClockCycle)c;
static bool initialized = false;
if (initialized) return;
initialized = true;
Instr instr;
// fill jump table with ILLEGALs
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_ILLEGAL;
for(int i = 0; i < 256; i++)
{
InstrTable[i] = instr;
}
// insert opcodes
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_ADC;
instr.cycles = 2;
InstrTable[0x69] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_ADC;
instr.cycles = 4;
InstrTable[0x6D] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_ADC;
instr.cycles = 3;
InstrTable[0x65] = instr;
instr.addr = &mos6502::Addr_INX;
instr.code = &mos6502::Op_ADC;
instr.cycles = 6;
InstrTable[0x61] = instr;
instr.addr = &mos6502::Addr_INY;
instr.code = &mos6502::Op_ADC;
instr.cycles = 6;
InstrTable[0x71] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_ADC;
instr.cycles = 4;
InstrTable[0x75] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_ADC;
instr.cycles = 4;
InstrTable[0x7D] = instr;
instr.addr = &mos6502::Addr_ABY;
instr.code = &mos6502::Op_ADC;
instr.cycles = 4;
InstrTable[0x79] = instr;
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_AND;
instr.cycles = 2;
InstrTable[0x29] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_AND;
instr.cycles = 4;
InstrTable[0x2D] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_AND;
instr.cycles = 3;
InstrTable[0x25] = instr;
instr.addr = &mos6502::Addr_INX;
instr.code = &mos6502::Op_AND;
instr.cycles = 6;
InstrTable[0x21] = instr;
instr.addr = &mos6502::Addr_INY;
instr.code = &mos6502::Op_AND;
instr.cycles = 5;
InstrTable[0x31] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_AND;
instr.cycles = 4;
InstrTable[0x35] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_AND;
instr.cycles = 4;
InstrTable[0x3D] = instr;
instr.addr = &mos6502::Addr_ABY;
instr.code = &mos6502::Op_AND;
instr.cycles = 4;
InstrTable[0x39] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_ASL;
instr.cycles = 6;
InstrTable[0x0E] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_ASL;
instr.cycles = 5;
InstrTable[0x06] = instr;
instr.addr = &mos6502::Addr_ACC;
instr.code = &mos6502::Op_ASL_ACC;
instr.cycles = 2;
InstrTable[0x0A] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_ASL;
instr.cycles = 6;
InstrTable[0x16] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_ASL;
instr.cycles = 7;
InstrTable[0x1E] = instr;
instr.addr = &mos6502::Addr_REL;
instr.code = &mos6502::Op_BCC;
instr.cycles = 2;
InstrTable[0x90] = instr;
instr.addr = &mos6502::Addr_REL;
instr.code = &mos6502::Op_BCS;
instr.cycles = 2;
InstrTable[0xB0] = instr;
instr.addr = &mos6502::Addr_REL;
instr.code = &mos6502::Op_BEQ;
instr.cycles = 2;
InstrTable[0xF0] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_BIT;
instr.cycles = 4;
InstrTable[0x2C] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_BIT;
instr.cycles = 3;
InstrTable[0x24] = instr;
instr.addr = &mos6502::Addr_REL;
instr.code = &mos6502::Op_BMI;
instr.cycles = 2;
InstrTable[0x30] = instr;
instr.addr = &mos6502::Addr_REL;
instr.code = &mos6502::Op_BNE;
instr.cycles = 2;
InstrTable[0xD0] = instr;
instr.addr = &mos6502::Addr_REL;
instr.code = &mos6502::Op_BPL;
instr.cycles = 2;
InstrTable[0x10] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_BRK;
instr.cycles = 7;
InstrTable[0x00] = instr;
instr.addr = &mos6502::Addr_REL;
instr.code = &mos6502::Op_BVC;
instr.cycles = 2;
InstrTable[0x50] = instr;
instr.addr = &mos6502::Addr_REL;
instr.code = &mos6502::Op_BVS;
instr.cycles = 2;
InstrTable[0x70] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_CLC;
instr.cycles = 2;
InstrTable[0x18] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_CLD;
instr.cycles = 2;
InstrTable[0xD8] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_CLI;
instr.cycles = 2;
InstrTable[0x58] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_CLV;
instr.cycles = 2;
InstrTable[0xB8] = instr;
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_CMP;
instr.cycles = 2;
InstrTable[0xC9] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_CMP;
instr.cycles = 4;
InstrTable[0xCD] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_CMP;
instr.cycles = 3;
InstrTable[0xC5] = instr;
instr.addr = &mos6502::Addr_INX;
instr.code = &mos6502::Op_CMP;
instr.cycles = 6;
InstrTable[0xC1] = instr;
instr.addr = &mos6502::Addr_INY;
instr.code = &mos6502::Op_CMP;
instr.cycles = 3;
InstrTable[0xD1] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_CMP;
instr.cycles = 4;
InstrTable[0xD5] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_CMP;
instr.cycles = 4;
InstrTable[0xDD] = instr;
instr.addr = &mos6502::Addr_ABY;
instr.code = &mos6502::Op_CMP;
instr.cycles = 4;
InstrTable[0xD9] = instr;
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_CPX;
instr.cycles = 2;
InstrTable[0xE0] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_CPX;
instr.cycles = 4;
InstrTable[0xEC] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_CPX;
instr.cycles = 3;
InstrTable[0xE4] = instr;
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_CPY;
instr.cycles = 2;
InstrTable[0xC0] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_CPY;
instr.cycles = 4;
InstrTable[0xCC] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_CPY;
instr.cycles = 3;
InstrTable[0xC4] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_DEC;
instr.cycles = 6;
InstrTable[0xCE] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_DEC;
instr.cycles = 5;
InstrTable[0xC6] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_DEC;
instr.cycles = 6;
InstrTable[0xD6] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_DEC;
instr.cycles = 7;
InstrTable[0xDE] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_DEX;
instr.cycles = 2;
InstrTable[0xCA] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_DEY;
instr.cycles = 2;
InstrTable[0x88] = instr;
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_EOR;
instr.cycles = 2;
InstrTable[0x49] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_EOR;
instr.cycles = 4;
InstrTable[0x4D] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_EOR;
instr.cycles = 3;
InstrTable[0x45] = instr;
instr.addr = &mos6502::Addr_INX;
instr.code = &mos6502::Op_EOR;
instr.cycles = 6;
InstrTable[0x41] = instr;
instr.addr = &mos6502::Addr_INY;
instr.code = &mos6502::Op_EOR;
instr.cycles = 5;
InstrTable[0x51] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_EOR;
instr.cycles = 4;
InstrTable[0x55] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_EOR;
instr.cycles = 4;
InstrTable[0x5D] = instr;
instr.addr = &mos6502::Addr_ABY;
instr.code = &mos6502::Op_EOR;
instr.cycles = 4;
InstrTable[0x59] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_INC;
instr.cycles = 6;
InstrTable[0xEE] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_INC;
instr.cycles = 5;
InstrTable[0xE6] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_INC;
instr.cycles = 6;
InstrTable[0xF6] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_INC;
instr.cycles = 7;
InstrTable[0xFE] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_INX;
instr.cycles = 2;
InstrTable[0xE8] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_INY;
instr.cycles = 2;
InstrTable[0xC8] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_JMP;
instr.cycles = 3;
InstrTable[0x4C] = instr;
instr.addr = &mos6502::Addr_ABI;
instr.code = &mos6502::Op_JMP;
instr.cycles = 5;
InstrTable[0x6C] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_JSR;
instr.cycles = 6;
InstrTable[0x20] = instr;
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_LDA;
instr.cycles = 2;
InstrTable[0xA9] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_LDA;
instr.cycles = 4;
InstrTable[0xAD] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_LDA;
instr.cycles = 3;
InstrTable[0xA5] = instr;
instr.addr = &mos6502::Addr_INX;
instr.code = &mos6502::Op_LDA;
instr.cycles = 6;
InstrTable[0xA1] = instr;
instr.addr = &mos6502::Addr_INY;
instr.code = &mos6502::Op_LDA;
instr.cycles = 5;
InstrTable[0xB1] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_LDA;
instr.cycles = 4;
InstrTable[0xB5] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_LDA;
instr.cycles = 4;
InstrTable[0xBD] = instr;
instr.addr = &mos6502::Addr_ABY;
instr.code = &mos6502::Op_LDA;
instr.cycles = 4;
InstrTable[0xB9] = instr;
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_LDX;
instr.cycles = 2;
InstrTable[0xA2] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_LDX;
instr.cycles = 4;
InstrTable[0xAE] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_LDX;
instr.cycles = 3;
InstrTable[0xA6] = instr;
instr.addr = &mos6502::Addr_ABY;
instr.code = &mos6502::Op_LDX;
instr.cycles = 4;
InstrTable[0xBE] = instr;
instr.addr = &mos6502::Addr_ZEY;
instr.code = &mos6502::Op_LDX;
instr.cycles = 4;
InstrTable[0xB6] = instr;
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_LDY;
instr.cycles = 2;
InstrTable[0xA0] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_LDY;
instr.cycles = 4;
InstrTable[0xAC] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_LDY;
instr.cycles = 3;
InstrTable[0xA4] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_LDY;
instr.cycles = 4;
InstrTable[0xB4] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_LDY;
instr.cycles = 4;
InstrTable[0xBC] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_LSR;
instr.cycles = 6;
InstrTable[0x4E] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_LSR;
instr.cycles = 5;
InstrTable[0x46] = instr;
instr.addr = &mos6502::Addr_ACC;
instr.code = &mos6502::Op_LSR_ACC;
instr.cycles = 2;
InstrTable[0x4A] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_LSR;
instr.cycles = 6;
InstrTable[0x56] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_LSR;
instr.cycles = 7;
InstrTable[0x5E] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_NOP;
instr.cycles = 2;
InstrTable[0xEA] = instr;
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_ORA;
instr.cycles = 2;
InstrTable[0x09] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_ORA;
instr.cycles = 4;
InstrTable[0x0D] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_ORA;
instr.cycles = 3;
InstrTable[0x05] = instr;
instr.addr = &mos6502::Addr_INX;
instr.code = &mos6502::Op_ORA;
instr.cycles = 6;
InstrTable[0x01] = instr;
instr.addr = &mos6502::Addr_INY;
instr.code = &mos6502::Op_ORA;
instr.cycles = 5;
InstrTable[0x11] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_ORA;
instr.cycles = 4;
InstrTable[0x15] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_ORA;
instr.cycles = 4;
InstrTable[0x1D] = instr;
instr.addr = &mos6502::Addr_ABY;
instr.code = &mos6502::Op_ORA;
instr.cycles = 4;
InstrTable[0x19] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_PHA;
instr.cycles = 3;
InstrTable[0x48] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_PHP;
instr.cycles = 3;
InstrTable[0x08] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_PLA;
instr.cycles = 4;
InstrTable[0x68] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_PLP;
instr.cycles = 4;
InstrTable[0x28] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_ROL;
instr.cycles = 6;
InstrTable[0x2E] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_ROL;
instr.cycles = 5;
InstrTable[0x26] = instr;
instr.addr = &mos6502::Addr_ACC;
instr.code = &mos6502::Op_ROL_ACC;
instr.cycles = 2;
InstrTable[0x2A] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_ROL;
instr.cycles = 6;
InstrTable[0x36] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_ROL;
instr.cycles = 7;
InstrTable[0x3E] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_ROR;
instr.cycles = 6;
InstrTable[0x6E] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_ROR;
instr.cycles = 5;
InstrTable[0x66] = instr;
instr.addr = &mos6502::Addr_ACC;
instr.code = &mos6502::Op_ROR_ACC;
instr.cycles = 2;
InstrTable[0x6A] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_ROR;
instr.cycles = 6;
InstrTable[0x76] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_ROR;
instr.cycles = 7;
InstrTable[0x7E] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_RTI;
instr.cycles = 6;
InstrTable[0x40] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_RTS;
instr.cycles = 6;
InstrTable[0x60] = instr;
instr.addr = &mos6502::Addr_IMM;
instr.code = &mos6502::Op_SBC;
instr.cycles = 2;
InstrTable[0xE9] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_SBC;
instr.cycles = 4;
InstrTable[0xED] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_SBC;
instr.cycles = 3;
InstrTable[0xE5] = instr;
instr.addr = &mos6502::Addr_INX;
instr.code = &mos6502::Op_SBC;
instr.cycles = 6;
InstrTable[0xE1] = instr;
instr.addr = &mos6502::Addr_INY;
instr.code = &mos6502::Op_SBC;
instr.cycles = 5;
InstrTable[0xF1] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_SBC;
instr.cycles = 4;
InstrTable[0xF5] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_SBC;
instr.cycles = 4;
InstrTable[0xFD] = instr;
instr.addr = &mos6502::Addr_ABY;
instr.code = &mos6502::Op_SBC;
instr.cycles = 4;
InstrTable[0xF9] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_SEC;
instr.cycles = 2;
InstrTable[0x38] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_SED;
instr.cycles = 2;
InstrTable[0xF8] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_SEI;
instr.cycles = 2;
InstrTable[0x78] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_STA;
instr.cycles = 4;
InstrTable[0x8D] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_STA;
instr.cycles = 3;
InstrTable[0x85] = instr;
instr.addr = &mos6502::Addr_INX;
instr.code = &mos6502::Op_STA;
instr.cycles = 6;
InstrTable[0x81] = instr;
instr.addr = &mos6502::Addr_INY;
instr.code = &mos6502::Op_STA;
instr.cycles = 6;
InstrTable[0x91] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_STA;
instr.cycles = 4;
InstrTable[0x95] = instr;
instr.addr = &mos6502::Addr_ABX;
instr.code = &mos6502::Op_STA;
instr.cycles = 5;
InstrTable[0x9D] = instr;
instr.addr = &mos6502::Addr_ABY;
instr.code = &mos6502::Op_STA;
instr.cycles = 5;
InstrTable[0x99] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_STX;
instr.cycles = 4;
InstrTable[0x8E] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_STX;
instr.cycles = 3;
InstrTable[0x86] = instr;
instr.addr = &mos6502::Addr_ZEY;
instr.code = &mos6502::Op_STX;
instr.cycles = 4;
InstrTable[0x96] = instr;
instr.addr = &mos6502::Addr_ABS;
instr.code = &mos6502::Op_STY;
instr.cycles = 4;
InstrTable[0x8C] = instr;
instr.addr = &mos6502::Addr_ZER;
instr.code = &mos6502::Op_STY;
instr.cycles = 3;
InstrTable[0x84] = instr;
instr.addr = &mos6502::Addr_ZEX;
instr.code = &mos6502::Op_STY;
instr.cycles = 4;
InstrTable[0x94] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_TAX;
instr.cycles = 2;
InstrTable[0xAA] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_TAY;
instr.cycles = 2;
InstrTable[0xA8] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_TSX;
instr.cycles = 2;
InstrTable[0xBA] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_TXA;
instr.cycles = 2;
InstrTable[0x8A] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_TXS;
instr.cycles = 2;
InstrTable[0x9A] = instr;
instr.addr = &mos6502::Addr_IMP;
instr.code = &mos6502::Op_TYA;
instr.cycles = 2;
InstrTable[0x98] = instr;
return;
}
uint16_t mos6502::Addr_ACC()
{
return 0; // not used
}
uint16_t mos6502::Addr_IMM()
{
return pc++;
}
uint16_t mos6502::Addr_ABS()
{
uint16_t addrL;
uint16_t addrH;
uint16_t addr;
addrL = Read(pc++);
addrH = Read(pc++);
addr = addrL + (addrH << 8);
return addr;
}
uint16_t mos6502::Addr_ZER()
{
return Read(pc++);
}
uint16_t mos6502::Addr_IMP()
{
return 0; // not used
}
uint16_t mos6502::Addr_REL()
{
uint16_t offset;
uint16_t addr;
offset = (uint16_t)Read(pc++);
if (offset & 0x80) offset |= 0xFF00;
addr = pc + (int16_t)offset;
return addr;
}
uint16_t mos6502::Addr_ABI()
{
uint16_t addrL;
uint16_t addrH;
uint16_t effL;
uint16_t effH;
uint16_t abs;
uint16_t addr;
addrL = Read(pc++);
addrH = Read(pc++);
abs = (addrH << 8) | addrL;
effL = Read(abs);
#ifndef CMOS_INDIRECT_JMP_FIX
effH = Read((abs & 0xFF00) + ((abs + 1) & 0x00FF) );
#else
effH = Read(abs + 1);
#endif
addr = effL + 0x100 * effH;
return addr;
}
uint16_t mos6502::Addr_ZEX()
{
uint16_t addr = (Read(pc++) + X) & 0xFF;
return addr;
}
uint16_t mos6502::Addr_ZEY()
{
uint16_t addr = (Read(pc++) + Y) & 0xFF;
return addr;
}
uint16_t mos6502::Addr_ABX()
{
uint16_t addr;
uint16_t addrL;
uint16_t addrH;
addrL = Read(pc++);
addrH = Read(pc++);
addr = addrL + (addrH << 8) + X;
return addr;
}
uint16_t mos6502::Addr_ABY()
{
uint16_t addr;
uint16_t addrL;
uint16_t addrH;
addrL = Read(pc++);
addrH = Read(pc++);
addr = addrL + (addrH << 8) + Y;
return addr;
}
uint16_t mos6502::Addr_INX()
{
uint16_t zeroL;
uint16_t zeroH;
uint16_t addr;
zeroL = (Read(pc++) + X) & 0xFF;
zeroH = (zeroL + 1) & 0xFF;
addr = Read(zeroL) + (Read(zeroH) << 8);
return addr;
}
uint16_t mos6502::Addr_INY()
{
uint16_t zeroL;
uint16_t zeroH;
uint16_t addr;
zeroL = Read(pc++);
zeroH = (zeroL + 1) & 0xFF;
addr = Read(zeroL) + (Read(zeroH) << 8) + Y;
return addr;
}
void mos6502::Reset()
{
A = reset_A;
Y = reset_Y;
X = reset_X;
// load PC from reset vector
uint8_t pcl = Read(rstVectorL);
uint8_t pch = Read(rstVectorH);
pc = (pch << 8) + pcl;
sp = reset_sp;
status = reset_status | CONSTANT | BREAK;
illegalOpcode = false;
return;
}
void mos6502::StackPush(uint8_t byte)
{
Write(0x0100 + sp, byte);
if(sp == 0x00) sp = 0xFF;
else sp--;
}
uint8_t mos6502::StackPop()
{
if(sp == 0xFF) sp = 0x00;
else sp++;
return Read(0x0100 + sp);
}
void mos6502::IRQ()
{
if(!IF_INTERRUPT())
{
//SET_BREAK(0);
StackPush((pc >> 8) & 0xFF);
StackPush(pc & 0xFF);
StackPush((status & ~BREAK) | CONSTANT);
SET_INTERRUPT(1);
// load PC from interrupt request vector
uint8_t pcl = Read(irqVectorL);
uint8_t pch = Read(irqVectorH);
pc = (pch << 8) + pcl;
}
return;
}
void mos6502::NMI()
{
//SET_BREAK(0);
StackPush((pc >> 8) & 0xFF);
StackPush(pc & 0xFF);
StackPush((status & ~BREAK) | CONSTANT);
SET_INTERRUPT(1);
// load PC from non-maskable interrupt vector
uint8_t pcl = Read(nmiVectorL);
uint8_t pch = Read(nmiVectorH);
pc = (pch << 8) + pcl;
return;
}
void mos6502::Run(
int32_t cyclesRemaining,
uint64_t& cycleCount,
CycleMethod cycleMethod
) {
uint8_t opcode;
Instr instr;
while(cyclesRemaining > 0 && !illegalOpcode)
{
// fetch
opcode = Read(pc++);
// decode
instr = InstrTable[opcode];
// execute
Exec(instr);
cycleCount += instr.cycles;
cyclesRemaining -=
cycleMethod == CYCLE_COUNT ? instr.cycles
/* cycleMethod == INST_COUNT */ : 1;
// run clock cycle callback
if (Cycle)
for(int i = 0; i < instr.cycles; i++)
Cycle(this);
}
}
void mos6502::RunEternally()
{
uint8_t opcode;
Instr instr;
while(!illegalOpcode)
{
// fetch
opcode = Read(pc++);
// decode
instr = InstrTable[opcode];
// execute
Exec(instr);
// run clock cycle callback
if (Cycle)
for(int i = 0; i < instr.cycles; i++)
Cycle(this);
}
}
void mos6502::Exec(Instr i)
{
uint16_t src = (this->*i.addr)();
(this->*i.code)(src);
}
uint16_t mos6502::GetPC()
{
return pc;
}
uint8_t mos6502::GetS()
{
return sp;
}
uint8_t mos6502::GetP()
{
return status;
}
uint8_t mos6502::GetA()
{