using System; // Do not modify this file directly! This is GENERATED code. // Please open the CpuCoreGenerator solution and make your modifications there. namespace BizHawk.Emulation.CPUs.M6502 { public partial class MOS6502 { public void Execute(int cycles) { sbyte rel8; byte value8, temp8; ushort value16, temp16; int temp; PendingCycles += cycles; while (PendingCycles > 0) { if (NMI) { TriggerException(ExceptionType.NMI); NMI = false; } if (IRQ && !FlagI) { if (SEI_Pending) FlagI = true; TriggerException(ExceptionType.IRQ); } if (CLI_Pending) { FlagI = false; CLI_Pending = false; } if (SEI_Pending) { FlagI = true; SEI_Pending = false; } if(debug) Console.WriteLine(State()); ushort this_pc = PC; byte opcode = ReadMemory(PC++); switch (opcode) { case 0x00: // BRK TriggerException(ExceptionType.BRK); break; case 0x01: // ORA (addr,X) value8 = ReadMemory(ReadWordPageWrap((byte)(ReadMemory(PC++)+X))); A |= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x04: // NOP zp PC += 1; PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x05: // ORA zp value8 = ReadMemory(ReadMemory(PC++)); A |= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x06: // ASL zp value16 = ReadMemory(PC++); value8 = ReadMemory(value16); FlagC = (value8 & 0x80) != 0; value8 = (byte)(value8 << 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0x08: // PHP FlagB = true; //why would it do this?? how weird WriteMemory((ushort)(S-- + 0x100), P); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x09: // ORA #nn value8 = ReadMemory(PC++); A |= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x0A: // ASL A FlagC = (A & 0x80) != 0; A = (byte) (A << 1); P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x0C: // NOP (addr) PC += 2; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x0D: // ORA addr value8 = ReadMemory(ReadWord(PC)); PC += 2; A |= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x0E: // ASL addr value16 = ReadWord(PC); PC += 2; value8 = ReadMemory(value16); FlagC = (value8 & 0x80) != 0; value8 = (byte)(value8 << 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x10: // BPL +/-rel rel8 = (sbyte)ReadMemory(PC++); value16 = (ushort)(PC+rel8); if (FlagN == false) { PendingCycles--; TotalExecutedCycles++; if ((PC & 0xFF00) != (value16 & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC = value16; } PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x11: // ORA (addr),Y* temp16 = ReadWordPageWrap(ReadMemory(PC++)); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16+Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } A |= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0x14: // NOP zp,X PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x15: // ORA zp,X value8 = ReadMemory((byte)(ReadMemory(PC++)+X)); A |= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x16: // ASL zp,X value16 = (byte)(ReadMemory(PC++)+X); value8 = ReadMemory(value16); FlagC = (value8 & 0x80) != 0; value8 = (byte)(value8 << 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x18: // CLC FlagC = false; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x19: // ORA addr,Y* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16 + Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; A |= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x1A: // NOP PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x1C: // NOP (addr,X) PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x1D: // ORA addr,X* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+X)); if ((temp16 & 0xFF00) != ((temp16 + X) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; A |= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x1E: // ASL addr,X value16 = (ushort)(ReadWord(PC)+X); PC += 2; value8 = ReadMemory(value16); FlagC = (value8 & 0x80) != 0; value8 = (byte)(value8 << 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 7; TotalExecutedCycles += 7; break; case 0x20: // JSR addr temp16 = (ushort)(PC+1); WriteMemory((ushort)(S-- + 0x100), (byte)(temp16 >> 8)); WriteMemory((ushort)(S-- + 0x100), (byte)temp16); PC = ReadWord(PC); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x21: // AND (addr,X) value8 = ReadMemory(ReadWordPageWrap((byte)(ReadMemory(PC++)+X))); A &= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x24: // BIT zp value8 = ReadMemory(ReadMemory(PC++)); FlagN = (value8 & 0x80) != 0; FlagV = (value8 & 0x40) != 0; FlagZ = (A & value8) == 0; PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x25: // AND zp value8 = ReadMemory(ReadMemory(PC++)); A &= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x26: // ROL zp value16 = ReadMemory(PC++); value8 = temp8 = ReadMemory(value16); value8 = (byte)((value8 << 1) | (P & 1)); WriteMemory(value16, value8); FlagC = (temp8 & 0x80) != 0; P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0x28: // PLP //handle I flag differently. sort of a sloppy way to do the job, but it does finish it off. value8 = ReadMemory((ushort)(++S + 0x100)); if ((value8 & 0x04) != 0 && !FlagI) SEI_Pending = true; if ((value8 & 0x04) == 0 && FlagI) CLI_Pending = true; value8 &= unchecked((byte)~0x04); P &= 0x04; P |= value8; FlagT = true;//this seems wrong PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x29: // AND #nn value8 = ReadMemory(PC++); A &= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x2A: // ROL A temp8 = A; A = (byte)((A << 1) | (P & 1)); FlagC = (temp8 & 0x80) != 0; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x2C: // BIT addr value8 = ReadMemory(ReadWord(PC)); PC += 2; FlagN = (value8 & 0x80) != 0; FlagV = (value8 & 0x40) != 0; FlagZ = (A & value8) == 0; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x2D: // AND addr value8 = ReadMemory(ReadWord(PC)); PC += 2; A &= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x2E: // ROL addr value16 = ReadWord(PC); PC += 2; value8 = temp8 = ReadMemory(value16); value8 = (byte)((value8 << 1) | (P & 1)); WriteMemory(value16, value8); FlagC = (temp8 & 0x80) != 0; P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x30: // BMI +/-rel rel8 = (sbyte)ReadMemory(PC++); value16 = (ushort)(PC+rel8); if (FlagN == true) { PendingCycles--; TotalExecutedCycles++; if ((PC & 0xFF00) != (value16 & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC = value16; } PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x31: // AND (addr),Y* temp16 = ReadWordPageWrap(ReadMemory(PC++)); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16+Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } A &= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0x34: // NOP zp,X PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x35: // AND zp,X value8 = ReadMemory((byte)(ReadMemory(PC++)+X)); A &= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x36: // ROL zp,X value16 = (byte)(ReadMemory(PC++)+X); value8 = temp8 = ReadMemory(value16); value8 = (byte)((value8 << 1) | (P & 1)); WriteMemory(value16, value8); FlagC = (temp8 & 0x80) != 0; P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x38: // SEC FlagC = true; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x39: // AND addr,Y* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16 + Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; A &= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x3A: // NOP PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x3C: // NOP (addr,X) PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x3D: // AND addr,X* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+X)); if ((temp16 & 0xFF00) != ((temp16 + X) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; A &= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x3E: // ROL addr,X value16 = (ushort)(ReadWord(PC)+X); PC += 2; value8 = temp8 = ReadMemory(value16); value8 = (byte)((value8 << 1) | (P & 1)); WriteMemory(value16, value8); FlagC = (temp8 & 0x80) != 0; P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 7; TotalExecutedCycles += 7; break; case 0x40: // RTI P = ReadMemory((ushort)(++S + 0x100)); FlagT = true;// this seems wrong PC = ReadMemory((ushort)(++S + 0x100)); PC |= (ushort)(ReadMemory((ushort)(++S + 0x100)) << 8); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x41: // EOR (addr,X) value8 = ReadMemory(ReadWordPageWrap((byte)(ReadMemory(PC++)+X))); A ^= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x44: // NOP zp PC += 1; PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x45: // EOR zp value8 = ReadMemory(ReadMemory(PC++)); A ^= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x46: // LSR zp value16 = ReadMemory(PC++); value8 = ReadMemory(value16); FlagC = (value8 & 1) != 0; value8 = (byte)(value8 >> 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0x48: // PHA WriteMemory((ushort)(S-- + 0x100), A); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x49: // EOR #nn value8 = ReadMemory(PC++); A ^= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x4A: // LSR A FlagC = (A & 1) != 0; A = (byte) (A >> 1); P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x4C: // JMP addr PC = ReadWord(PC); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x4D: // EOR addr value8 = ReadMemory(ReadWord(PC)); PC += 2; A ^= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x4E: // LSR addr value16 = ReadWord(PC); PC += 2; value8 = ReadMemory(value16); FlagC = (value8 & 1) != 0; value8 = (byte)(value8 >> 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x50: // BVC +/-rel rel8 = (sbyte)ReadMemory(PC++); value16 = (ushort)(PC+rel8); if (FlagV == false) { PendingCycles--; TotalExecutedCycles++; if ((PC & 0xFF00) != (value16 & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC = value16; } PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x51: // EOR (addr),Y* temp16 = ReadWordPageWrap(ReadMemory(PC++)); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16+Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } A ^= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0x54: // NOP zp,X PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x55: // EOR zp,X value8 = ReadMemory((byte)(ReadMemory(PC++)+X)); A ^= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x56: // LSR zp,X value16 = (byte)(ReadMemory(PC++)+X); value8 = ReadMemory(value16); FlagC = (value8 & 1) != 0; value8 = (byte)(value8 >> 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x58: // CLI //FlagI = false; CLI_Pending = true; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x59: // EOR addr,Y* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16 + Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; A ^= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x5A: // NOP PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x5C: // NOP (addr,X) PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x5D: // EOR addr,X* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+X)); if ((temp16 & 0xFF00) != ((temp16 + X) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; A ^= value8; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x5E: // LSR addr,X value16 = (ushort)(ReadWord(PC)+X); PC += 2; value8 = ReadMemory(value16); FlagC = (value8 & 1) != 0; value8 = (byte)(value8 >> 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 7; TotalExecutedCycles += 7; break; case 0x60: // RTS PC = ReadMemory((ushort)(++S + 0x100)); PC |= (ushort)(ReadMemory((ushort)(++S + 0x100)) << 8); PC++; PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x61: // ADC (addr,X) value8 = ReadMemory(ReadWordPageWrap((byte)(ReadMemory(PC++)+X))); temp = value8 + A + (FlagC ? 1 : 0); FlagV = (~(A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp > 0xFF; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x64: // NOP zp PC += 1; PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x65: // ADC zp value8 = ReadMemory(ReadMemory(PC++)); temp = value8 + A + (FlagC ? 1 : 0); FlagV = (~(A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp > 0xFF; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x66: // ROR zp value16 = ReadMemory(PC++); value8 = temp8 = ReadMemory(value16); value8 = (byte)((value8 >> 1) | ((P & 1)<<7)); WriteMemory(value16, value8); FlagC = (temp8 & 1) != 0; P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0x68: // PLA A = ReadMemory((ushort)(++S + 0x100)); P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x69: // ADC #nn value8 = ReadMemory(PC++); temp = value8 + A + (FlagC ? 1 : 0); FlagV = (~(A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp > 0xFF; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x6A: // ROR A temp8 = A; A = (byte)((A >> 1) | ((P & 1)<<7)); FlagC = (temp8 & 1) != 0; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x6C: // JMP (addr) PC = ReadWordPageWrap(ReadWord(PC)); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0x6D: // ADC addr value8 = ReadMemory(ReadWord(PC)); PC += 2; temp = value8 + A + (FlagC ? 1 : 0); FlagV = (~(A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp > 0xFF; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x6E: // ROR addr value16 = ReadWord(PC); PC += 2; value8 = temp8 = ReadMemory(value16); value8 = (byte)((value8 >> 1) | ((P & 1)<<7)); WriteMemory(value16, value8); FlagC = (temp8 & 1) != 0; P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x70: // BVS +/-rel rel8 = (sbyte)ReadMemory(PC++); value16 = (ushort)(PC+rel8); if (FlagV == true) { PendingCycles--; TotalExecutedCycles++; if ((PC & 0xFF00) != (value16 & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC = value16; } PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x71: // ADC (addr),Y* temp16 = ReadWordPageWrap(ReadMemory(PC++)); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16+Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } temp = value8 + A + (FlagC ? 1 : 0); FlagV = (~(A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp > 0xFF; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0x74: // NOP zp,X PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x75: // ADC zp,X value8 = ReadMemory((byte)(ReadMemory(PC++)+X)); temp = value8 + A + (FlagC ? 1 : 0); FlagV = (~(A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp > 0xFF; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x76: // ROR zp,X value16 = (byte)(ReadMemory(PC++)+X); value8 = temp8 = ReadMemory(value16); value8 = (byte)((value8 >> 1) | ((P & 1)<<7)); WriteMemory(value16, value8); FlagC = (temp8 & 1) != 0; P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x78: // SEI //FlagI = true; SEI_Pending = true; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x79: // ADC addr,Y* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16 + Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; temp = value8 + A + (FlagC ? 1 : 0); FlagV = (~(A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp > 0xFF; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x7A: // NOP PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x7C: // NOP (addr,X) PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x7D: // ADC addr,X* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+X)); if ((temp16 & 0xFF00) != ((temp16 + X) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; temp = value8 + A + (FlagC ? 1 : 0); FlagV = (~(A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp > 0xFF; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x7E: // ROR addr,X value16 = (ushort)(ReadWord(PC)+X); PC += 2; value8 = temp8 = ReadMemory(value16); value8 = (byte)((value8 >> 1) | ((P & 1)<<7)); WriteMemory(value16, value8); FlagC = (temp8 & 1) != 0; P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 7; TotalExecutedCycles += 7; break; case 0x80: // NOP #nn PC += 1; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x81: // STA (addr,X) temp8 = (byte)(ReadMemory(PC++) + X); value16 = ReadWordPageWrap(temp8); WriteMemory(value16, A); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x82: // NOP #nn PC += 1; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x84: // STY zp value16 = ReadMemory(PC++); WriteMemory(value16, Y); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x85: // STA zp value16 = ReadMemory(PC++); WriteMemory(value16, A); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x86: // STX zp value16 = ReadMemory(PC++); WriteMemory(value16, X); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0x88: // DEY P = (byte)((P & 0x7D) | TableNZ[--Y]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x89: // NOP #nn PC += 1; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x8A: // TXA A = X; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x8C: // STY addr value16 = ReadWord(PC); PC += 2; WriteMemory(value16, Y); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x8D: // STA addr value16 = ReadWord(PC); PC += 2; WriteMemory(value16, A); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x8E: // STX addr value16 = ReadWord(PC); PC += 2; WriteMemory(value16, X); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x90: // BCC +/-rel rel8 = (sbyte)ReadMemory(PC++); value16 = (ushort)(PC+rel8); if (FlagC == false) { PendingCycles--; TotalExecutedCycles++; if ((PC & 0xFF00) != (value16 & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC = value16; } PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x91: // STA (addr),Y temp16 = ReadWordPageWrap(ReadMemory(PC++)); value16 = (ushort)(temp16+Y); WriteMemory(value16, A); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0x94: // STY zp,X value16 = (byte)(ReadMemory(PC++)+X); WriteMemory(value16, Y); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x95: // STA zp,X value16 = (byte)(ReadMemory(PC++)+X); WriteMemory(value16, A); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x96: // STX zp,Y value16 = (byte)(ReadMemory(PC++)+Y); WriteMemory(value16, X); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0x98: // TYA A = Y; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x99: // STA addr,Y value16 = (ushort)(ReadWord(PC)+Y); PC += 2; WriteMemory(value16, A); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0x9A: // TXS S = X; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0x9D: // STA addr,X value16 = (ushort)(ReadWord(PC)+X); PC += 2; WriteMemory(value16, A); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0xA0: // LDY #nn Y = ReadMemory(PC++); P = (byte)((P & 0x7D) | TableNZ[Y]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xA1: // LDA (addr,X) A = ReadMemory(ReadWordPageWrap((byte)(ReadMemory(PC++)+X))); P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0xA2: // LDX #nn X = ReadMemory(PC++); P = (byte)((P & 0x7D) | TableNZ[X]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xA4: // LDY zp Y = ReadMemory(ReadMemory(PC++)); P = (byte)((P & 0x7D) | TableNZ[Y]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0xA5: // LDA zp A = ReadMemory(ReadMemory(PC++)); P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0xA6: // LDX zp X = ReadMemory(ReadMemory(PC++)); P = (byte)((P & 0x7D) | TableNZ[X]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0xA8: // TAY Y = A; P = (byte)((P & 0x7D) | TableNZ[Y]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xA9: // LDA #nn A = ReadMemory(PC++); P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xAA: // TAX X = A; P = (byte)((P & 0x7D) | TableNZ[X]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xAC: // LDY addr Y = ReadMemory(ReadWord(PC)); PC += 2; P = (byte)((P & 0x7D) | TableNZ[Y]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xAD: // LDA addr A = ReadMemory(ReadWord(PC)); PC += 2; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xAE: // LDX addr X = ReadMemory(ReadWord(PC)); PC += 2; P = (byte)((P & 0x7D) | TableNZ[X]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xB0: // BCS +/-rel rel8 = (sbyte)ReadMemory(PC++); value16 = (ushort)(PC+rel8); if (FlagC == true) { PendingCycles--; TotalExecutedCycles++; if ((PC & 0xFF00) != (value16 & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC = value16; } PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xB1: // LDA (addr),Y* temp16 = ReadWordPageWrap(ReadMemory(PC++)); A = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16+Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0xB4: // LDY zp,X Y = ReadMemory((byte)(ReadMemory(PC++)+X)); P = (byte)((P & 0x7D) | TableNZ[Y]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xB5: // LDA zp,X A = ReadMemory((byte)(ReadMemory(PC++)+X)); P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xB6: // LDX zp,Y X = ReadMemory((byte)(ReadMemory(PC++)+Y)); P = (byte)((P & 0x7D) | TableNZ[X]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xB8: // CLV FlagV = false; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xB9: // LDA addr,Y* temp16 = ReadWord(PC); A = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16 + Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xBA: // TSX X = S; P = (byte)((P & 0x7D) | TableNZ[X]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xBC: // LDY addr,X* temp16 = ReadWord(PC); Y = ReadMemory((ushort)(temp16+X)); if ((temp16 & 0xFF00) != ((temp16 + X) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; P = (byte)((P & 0x7D) | TableNZ[Y]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xBD: // LDA addr,X* temp16 = ReadWord(PC); A = ReadMemory((ushort)(temp16+X)); if ((temp16 & 0xFF00) != ((temp16 + X) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xBE: // LDX addr,Y* temp16 = ReadWord(PC); X = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16 + Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; P = (byte)((P & 0x7D) | TableNZ[X]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xC0: // CPY #nn value8 = ReadMemory(PC++); value16 = (ushort) (Y - value8); FlagC = (Y >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xC1: // CMP (addr,X) value8 = ReadMemory(ReadWordPageWrap((byte)(ReadMemory(PC++)+X))); value16 = (ushort) (A - value8); FlagC = (A >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0xC2: // NOP #nn PC += 1; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xC4: // CPY zp value8 = ReadMemory(ReadMemory(PC++)); value16 = (ushort) (Y - value8); FlagC = (Y >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0xC5: // CMP zp value8 = ReadMemory(ReadMemory(PC++)); value16 = (ushort) (A - value8); FlagC = (A >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0xC6: // DEC zp value16 = ReadMemory(PC++); value8 = (byte)(ReadMemory(value16) - 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0xC8: // INY P = (byte)((P & 0x7D) | TableNZ[++Y]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xC9: // CMP #nn value8 = ReadMemory(PC++); value16 = (ushort) (A - value8); FlagC = (A >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xCA: // DEX P = (byte)((P & 0x7D) | TableNZ[--X]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xCC: // CPY addr value8 = ReadMemory(ReadWord(PC)); PC += 2; value16 = (ushort) (Y - value8); FlagC = (Y >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xCD: // CMP addr value8 = ReadMemory(ReadWord(PC)); PC += 2; value16 = (ushort) (A - value8); FlagC = (A >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xCE: // DEC addr value16 = ReadWord(PC); PC += 2; value8 = (byte)(ReadMemory(value16) - 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0xD0: // BNE +/-rel rel8 = (sbyte)ReadMemory(PC++); value16 = (ushort)(PC+rel8); if (FlagZ == false) { PendingCycles--; TotalExecutedCycles++; if ((PC & 0xFF00) != (value16 & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC = value16; } PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xD1: // CMP (addr),Y* temp16 = ReadWordPageWrap(ReadMemory(PC++)); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16+Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } value16 = (ushort) (A - value8); FlagC = (A >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0xD4: // NOP zp,X PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xD5: // CMP zp,X value8 = ReadMemory((byte)(ReadMemory(PC++)+X)); value16 = (ushort) (A - value8); FlagC = (A >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xD6: // DEC zp,X value16 = (byte)(ReadMemory(PC++)+X); value8 = (byte)(ReadMemory(value16) - 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0xD8: // CLD FlagD = false; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xD9: // CMP addr,Y* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16 + Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; value16 = (ushort) (A - value8); FlagC = (A >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xDA: // NOP PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xDC: // NOP (addr,X) PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xDD: // CMP addr,X* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+X)); if ((temp16 & 0xFF00) != ((temp16 + X) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; value16 = (ushort) (A - value8); FlagC = (A >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xDE: // DEC addr,X value16 = (ushort)(ReadWord(PC)+X); PC += 2; value8 = (byte)(ReadMemory(value16) - 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 7; TotalExecutedCycles += 7; break; case 0xE0: // CPX #nn value8 = ReadMemory(PC++); value16 = (ushort) (X - value8); FlagC = (X >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xE1: // SBC (addr,X) value8 = ReadMemory(ReadWordPageWrap((byte)(ReadMemory(PC++)+X))); temp = A - value8 - (FlagC?0:1); FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp >= 0; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0xE2: // NOP #nn PC += 1; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xE4: // CPX zp value8 = ReadMemory(ReadMemory(PC++)); value16 = (ushort) (X - value8); FlagC = (X >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0xE5: // SBC zp value8 = ReadMemory(ReadMemory(PC++)); temp = A - value8 - (FlagC?0:1); FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp >= 0; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 3; TotalExecutedCycles += 3; break; case 0xE6: // INC zp value16 = ReadMemory(PC++); value8 = (byte)(ReadMemory(value16) + 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0xE8: // INX P = (byte)((P & 0x7D) | TableNZ[++X]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xE9: // SBC #nn value8 = ReadMemory(PC++); temp = A - value8 - (FlagC?0:1); FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp >= 0; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xEA: // NOP PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xEC: // CPX addr value8 = ReadMemory(ReadWord(PC)); PC += 2; value16 = (ushort) (X - value8); FlagC = (X >= value8); P = (byte)((P & 0x7D) | TableNZ[(byte)value16]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xED: // SBC addr value8 = ReadMemory(ReadWord(PC)); PC += 2; temp = A - value8 - (FlagC?0:1); FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp >= 0; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xEE: // INC addr value16 = ReadWord(PC); PC += 2; value8 = (byte)(ReadMemory(value16) + 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0xF0: // BEQ +/-rel rel8 = (sbyte)ReadMemory(PC++); value16 = (ushort)(PC+rel8); if (FlagZ == true) { PendingCycles--; TotalExecutedCycles++; if ((PC & 0xFF00) != (value16 & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC = value16; } PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xF1: // SBC (addr),Y* temp16 = ReadWordPageWrap(ReadMemory(PC++)); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16+Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } temp = A - value8 - (FlagC?0:1); FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp >= 0; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 5; TotalExecutedCycles += 5; break; case 0xF4: // NOP zp,X PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xF5: // SBC zp,X value8 = ReadMemory((byte)(ReadMemory(PC++)+X)); temp = A - value8 - (FlagC?0:1); FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp >= 0; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xF6: // INC zp,X value16 = (byte)(ReadMemory(PC++)+X); value8 = (byte)(ReadMemory(value16) + 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 6; TotalExecutedCycles += 6; break; case 0xF8: // SED FlagD = true; PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xF9: // SBC addr,Y* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+Y)); if ((temp16 & 0xFF00) != ((temp16 + Y) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; temp = A - value8 - (FlagC?0:1); FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp >= 0; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xFA: // NOP PendingCycles -= 2; TotalExecutedCycles += 2; break; case 0xFC: // NOP (addr,X) PC += 1; PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xFD: // SBC addr,X* temp16 = ReadWord(PC); value8 = ReadMemory((ushort)(temp16+X)); if ((temp16 & 0xFF00) != ((temp16 + X) & 0xFF00)) { PendingCycles--; TotalExecutedCycles++; } PC += 2; temp = A - value8 - (FlagC?0:1); FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0; FlagC = temp >= 0; A = (byte)temp; P = (byte)((P & 0x7D) | TableNZ[A]); PendingCycles -= 4; TotalExecutedCycles += 4; break; case 0xFE: // INC addr,X value16 = (ushort)(ReadWord(PC)+X); PC += 2; value8 = (byte)(ReadMemory(value16) + 1); WriteMemory(value16, value8); P = (byte)((P & 0x7D) | TableNZ[value8]); PendingCycles -= 7; TotalExecutedCycles += 7; break; default: if(throw_unhandled) throw new Exception(String.Format("Unhandled opcode: {0:X2}", opcode)); break; } } } } }