private void ADC(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "source8 = FlagT ? ReadMemory((ushort)(0x2000 + X)) : A;");
w.WriteLine();
w.WriteLine(Spaces + "if ((P & 0x08) != 0) {");
w.WriteLine(Spaces + " lo = (source8 & 0x0F) + (value8 & 0x0F) + (FlagC ? 1 : 0);");
w.WriteLine(Spaces + " hi = (source8 & 0xF0) + (value8 & 0xF0);");
w.WriteLine(Spaces + " if (lo > 0x09) {");
w.WriteLine(Spaces + " hi += 0x10;");
w.WriteLine(Spaces + " lo += 0x06;");
w.WriteLine(Spaces + " }");
w.WriteLine(Spaces + " if (hi > 0x90) hi += 0x60;");
w.WriteLine(Spaces + " FlagV = (~(source8^value8) & (source8^hi) & 0x80) != 0;");
w.WriteLine(Spaces + " FlagC = (hi & 0xFF00) != 0;");
w.WriteLine(Spaces + " source8 = (byte) ((lo & 0x0F) | (hi & 0xF0));");
w.WriteLine(Spaces + " PendingCycles--;");
w.WriteLine(Spaces + "} else {");
w.WriteLine(Spaces + " temp = value8 + source8 + (FlagC ? 1 : 0);");
w.WriteLine(Spaces + " FlagV = (~(source8 ^ value8) & (source8 ^ temp) & 0x80) != 0;");
w.WriteLine(Spaces + " FlagC = temp > 0xFF;");
w.WriteLine(Spaces + " source8 = (byte)temp;");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + "if (FlagT == false)");
w.WriteLine(Spaces + " A = source8;");
w.WriteLine(Spaces + "else { ");
w.WriteLine(Spaces + " WriteMemory((ushort)(0x2000 + X), source8);");
w.WriteLine(Spaces + " PendingCycles -= 3;");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + SetNZ("source8"));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void ADC(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "source8 = FlagT ? ReadMemory((ushort)(0x2000 + X)) : A;");
w.WriteLine();
w.WriteLine(Spaces + "if ((P & 0x08) != 0) {");
w.WriteLine(Spaces + " lo = (source8 & 0x0F) + (value8 & 0x0F) + (FlagC ? 1 : 0);");
w.WriteLine(Spaces + " hi = (source8 & 0xF0) + (value8 & 0xF0);");
w.WriteLine(Spaces + " if (lo > 0x09) {");
w.WriteLine(Spaces + " hi += 0x10;");
w.WriteLine(Spaces + " lo += 0x06;");
w.WriteLine(Spaces + " }");
w.WriteLine(Spaces + " if (hi > 0x90) hi += 0x60;");
w.WriteLine(Spaces + " FlagV = (~(source8^value8) & (source8^hi) & 0x80) != 0;");
w.WriteLine(Spaces + " FlagC = (hi & 0xFF00) != 0;");
w.WriteLine(Spaces + " source8 = (byte) ((lo & 0x0F) | (hi & 0xF0));");
w.WriteLine(Spaces + " PendingCycles--;");
w.WriteLine(Spaces + "} else {");
w.WriteLine(Spaces + " temp = value8 + source8 + (FlagC ? 1 : 0);");
w.WriteLine(Spaces + " FlagV = (~(source8 ^ value8) & (source8 ^ temp) & 0x80) != 0;");
w.WriteLine(Spaces + " FlagC = temp > 0xFF;");
w.WriteLine(Spaces + " source8 = (byte)temp;");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + "if (FlagT == false)");
w.WriteLine(Spaces + " A = source8;");
w.WriteLine(Spaces + "else { ");
w.WriteLine(Spaces + " WriteMemory((ushort)(0x2000 + X), source8);");
w.WriteLine(Spaces + " PendingCycles -= 3;");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + SetNZ("source8"));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void SXY(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "temp8 = X;");
w.WriteLine(Spaces + "X = Y;");
w.WriteLine(Spaces + "Y = temp8;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void RTS(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "PC = ReadMemory((ushort)(++S + 0x2100));");
w.WriteLine(Spaces + "PC |= (ushort)(ReadMemory((ushort)(++S + 0x2100)) << 8);");
w.WriteLine(Spaces + "PC++;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TIA(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "if (InBlockTransfer == false)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " InBlockTransfer = true;");
w.WriteLine(Spaces + " btFrom = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " btTo = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " btLen = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " btAlternator = 0;");
w.WriteLine(Spaces + " PendingCycles -= 14;");
w.WriteLine(Spaces + " PC -= 7;");
w.WriteLine(Spaces + " break;");
w.WriteLine(Spaces + "}");
w.WriteLine();
w.WriteLine(Spaces + "if (btLen-- != 0)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " WriteMemory((ushort)(btTo+btAlternator), ReadMemory(btFrom++));");
w.WriteLine(Spaces + " btAlternator ^= 1;");
w.WriteLine(Spaces + " PendingCycles -= 6;");
w.WriteLine(Spaces + " PC--;");
w.WriteLine(Spaces + " break;");
w.WriteLine(Spaces + "}");
w.WriteLine();
w.WriteLine(Spaces + "InBlockTransfer = false;");
w.WriteLine(Spaces + "PendingCycles -= 3;");
w.WriteLine(Spaces + "PC += 6;");
}
private void TDD(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "if (InBlockTransfer == false)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " InBlockTransfer = true;");
w.WriteLine(Spaces + " btFrom = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " btTo = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " btLen = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " PendingCycles -= 14;");
w.WriteLine(Spaces + " PC -= 7;");
w.WriteLine(Spaces + " break;");
w.WriteLine(Spaces + "}");
w.WriteLine();
w.WriteLine(Spaces + "if (btLen-- != 0)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " WriteMemory(btTo--, ReadMemory(btFrom--));");
w.WriteLine(Spaces + " PendingCycles -= 6;");
w.WriteLine(Spaces + " PC--;");
w.WriteLine(Spaces + " break;");
w.WriteLine(Spaces + "}");
w.WriteLine();
w.WriteLine(Spaces + "InBlockTransfer = false;");
w.WriteLine(Spaces + "PendingCycles -= 3;");
w.WriteLine(Spaces + "PC += 6;");
}
private void BB(OpcodeInfo op, TextWriter w, int bit, bool set)
{
string filter = "";
switch (bit)
{
case 0: filter = "0x01"; break;
case 1: filter = "0x02"; break;
case 2: filter = "0x04"; break;
case 3: filter = "0x08"; break;
case 4: filter = "0x10"; break;
case 5: filter = "0x20"; break;
case 6: filter = "0x40"; break;
case 7: filter = "0x80"; break;
}
string cond = set ? "!=" : "==";
w.WriteLine(Spaces + "value8 = ReadMemory((ushort)(ReadMemory(PC++)+0x2000));");
w.WriteLine(Spaces + "rel8 = (sbyte) ReadMemory(PC++);");
w.WriteLine(Spaces + "if ((value8 & " + filter + ") " + cond + " 0) {");
w.WriteLine(Spaces + " PendingCycles -= 2;");
w.WriteLine(Spaces + " PC = (ushort)(PC+rel8);");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void SMB(OpcodeInfo op, TextWriter w, int bit)
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "value8 = ReadMemory(value16);");
w.WriteLine(Spaces + "value8 |= 0x{0:X2};", (1 << bit));
w.WriteLine(Spaces + "WriteMemory(value16, value8);");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void JSR(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "temp16 = (ushort)(PC+1);");
w.WriteLine(Spaces + "WriteMemory((ushort)(S-- + 0x2100), (byte)(temp16 >> 8));");
w.WriteLine(Spaces + "WriteMemory((ushort)(S-- + 0x2100), (byte)temp16);");
w.WriteLine(Spaces + "PC = ReadWord(PC);");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void CMP_reg(OpcodeInfo op, TextWriter w, string reg)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "value16 = (ushort) (" + reg + " - value8);");
w.WriteLine(Spaces + "FlagC = (" + reg + " >= value8);");
w.WriteLine(Spaces + SetNZ("(byte)value16"));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void BIT(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "FlagN = (value8 & 0x80) != 0;");
w.WriteLine(Spaces + "FlagV = (value8 & 0x40) != 0;");
w.WriteLine(Spaces + "FlagZ = (A & value8) == 0;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void BSR(OpcodeInfo op, TextWriter w)
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "temp16 = (ushort)(PC-1);");
w.WriteLine(Spaces + "WriteMemory((ushort)(S-- + 0x2100), (byte)(temp16 >> 8));");
w.WriteLine(Spaces + "WriteMemory((ushort)(S-- + 0x2100), (byte)temp16);");
w.WriteLine(Spaces + "PC = value16;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TST(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "value8 = ReadMemory(PC++);");
GetValue8(op, w, "temp8");
w.WriteLine(Spaces + "FlagN = (temp8 & 0x80) != 0;");
w.WriteLine(Spaces + "FlagV = (temp8 & 0x40) != 0;");
w.WriteLine(Spaces + "FlagZ = (temp8 & value8) == 0;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void Branch(OpcodeInfo op, TextWriter w, string flag, bool cond)
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "if (Flag" + flag + " == " + cond.ToString().ToLower() + ") {");
w.WriteLine(Spaces + " PendingCycles -= 2;");
w.WriteLine(Spaces + " PC = value16;");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void SET(OpcodeInfo op, TextWriter w)
{
w.WriteLine(" int a; // TODO remove these extra checks"); // TODO remove these extra checks
w.WriteLine(" string b = Disassemble(PC, out a);");
w.WriteLine(" if (b.StartsWith(\"ADC\") == false && b.StartsWith(\"EOR\") == false && b.StartsWith(\"AND\") == false && b.StartsWith(\"ORA\") == false)");
w.WriteLine(" Console.WriteLine(\"SETTING T FLAG, NEXT INSTRUCTION IS UNHANDLED: {0}\", b);");
w.WriteLine(Spaces + "FlagT = true;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
w.WriteLine(Spaces + "goto AfterClearTFlag;");
}
private void TAM(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "for (byte reg=0; reg<8; reg++)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " if ((value8 & (1 << reg)) != 0)");
w.WriteLine(Spaces + " MPR[reg] = A;");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TSB(OpcodeInfo op, TextWriter w)
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "value8 = ReadMemory(value16);");
w.WriteLine(Spaces + "WriteMemory(value16, (byte)(value8 | A));");
w.WriteLine(Spaces + "FlagN = (value8 & 0x80) != 0;");
w.WriteLine(Spaces + "FlagV = (value8 & 0x40) != 0;");
w.WriteLine(Spaces + "FlagZ = (A | value8) == 0;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void JMP(OpcodeInfo op, TextWriter w)
{
switch (op.AddressMode)
{
case AddrMode.Absolute: w.WriteLine(Spaces + "PC = ReadWord(PC);"); break;
case AddrMode.AbsoluteIndirect: w.WriteLine(Spaces + "PC = ReadWord(ReadWord(PC));"); break;
case AddrMode.AbsoluteIndirectX: w.WriteLine(Spaces + "PC = ReadWord((ushort)(ReadWord(PC)+X));"); break;
}
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void Set(byte value, string instr, AddrMode addressMode, int cycles)
{
var op = new OpcodeInfo();
op.Instruction = instr;
op.AddressMode = addressMode;
op.Cycles = cycles;
if (Opcodes[value] != null)
{
throw new Exception("opcode " + value + " already assigned");
}
Opcodes[value] = op;
}
private void TMA(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + " if ((value8 & 0x01) != 0) A = MPR[0];");
w.WriteLine(Spaces + "else if ((value8 & 0x02) != 0) A = MPR[1];");
w.WriteLine(Spaces + "else if ((value8 & 0x04) != 0) A = MPR[2];");
w.WriteLine(Spaces + "else if ((value8 & 0x08) != 0) A = MPR[3];");
w.WriteLine(Spaces + "else if ((value8 & 0x10) != 0) A = MPR[4];");
w.WriteLine(Spaces + "else if ((value8 & 0x20) != 0) A = MPR[5];");
w.WriteLine(Spaces + "else if ((value8 & 0x40) != 0) A = MPR[6];");
w.WriteLine(Spaces + "else if ((value8 & 0x80) != 0) A = MPR[7];");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void BRK(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "Console.WriteLine(\"EXEC BRK\");");
w.WriteLine(Spaces + "PC++;");
w.WriteLine(Spaces + "WriteMemory((ushort)(S-- + 0x2100), (byte)(PC >> 8));");
w.WriteLine(Spaces + "WriteMemory((ushort)(S-- + 0x2100), (byte)PC);");
w.WriteLine(Spaces + "WriteMemory((ushort)(S-- + 0x2100), (byte)(P & (~0x10)));");
w.WriteLine(Spaces + "FlagT = false;");
w.WriteLine(Spaces + "FlagB = true;");
w.WriteLine(Spaces + "FlagD = false;");
w.WriteLine(Spaces + "FlagI = true;");
w.WriteLine(Spaces + "PC = ReadWord(IRQ2Vector);");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void INC(OpcodeInfo op, TextWriter w)
{
if (op.AddressMode != AddrMode.Accumulator)
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "value8 = (byte)(ReadMemory(value16) + 1);");
w.WriteLine(Spaces + "WriteMemory(value16, value8);");
w.WriteLine(Spaces + SetNZ("value8"));
}
else
{
w.WriteLine(Spaces + SetNZ("++A"));
}
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void AND(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "if (FlagT == false) { ");
w.WriteLine(Spaces + " A &= value8;");
w.WriteLine(Spaces + " " + SetNZ("A"));
w.WriteLine(Spaces + " PendingCycles -= {0};", op.Cycles);
w.WriteLine(Spaces + "} else {");
w.WriteLine(Spaces + " temp8 = ReadMemory((ushort)(0x2000 + X));");
w.WriteLine(Spaces + " temp8 &= value8;");
w.WriteLine(Spaces + " " + SetNZ("temp8"));
w.WriteLine(Spaces + " WriteMemory((ushort)(0x2000 + X), temp8);");
w.WriteLine(Spaces + " PendingCycles -= {0};", op.Cycles + 3);
w.WriteLine(Spaces + "}");
}
private void AND(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "if (FlagT == false) { ");
w.WriteLine(Spaces + " A &= value8;");
w.WriteLine(Spaces + " " + SetNZ("A"));
w.WriteLine(Spaces + " PendingCycles -= {0};", op.Cycles);
w.WriteLine(Spaces + "} else {");
w.WriteLine(Spaces + " temp8 = ReadMemory((ushort)(0x2000 + X));");
w.WriteLine(Spaces + " temp8 &= value8;");
w.WriteLine(Spaces + " " + SetNZ("temp8"));
w.WriteLine(Spaces + " WriteMemory((ushort)(0x2000 + X), temp8);");
w.WriteLine(Spaces + " PendingCycles -= {0};", op.Cycles + 3);
w.WriteLine(Spaces + "}");
}
private void GetValue8(OpcodeInfo op, TextWriter w, string dest)
{
switch (op.AddressMode)
{
case AddrMode.Immediate:
w.WriteLine(Spaces + dest + " = ReadMemory(PC++);"); break;
case AddrMode.ImmZeroPage:
case AddrMode.ZeroPage:
w.WriteLine(Spaces + dest + " = ReadMemory((ushort)(ReadMemory(PC++)+0x2000));"); break;
case AddrMode.ImmZeroPageX:
case AddrMode.ZeroPageX:
w.WriteLine(Spaces + dest + " = ReadMemory((ushort)(((ReadMemory(PC++)+X)&0xFF)+0x2000));"); break;
case AddrMode.ZeroPageY:
w.WriteLine(Spaces + dest + " = ReadMemory((ushort)(((ReadMemory(PC++)+Y)&0xFF)+0x2000));"); break;
case AddrMode.ImmAbsolute:
case AddrMode.Absolute:
w.WriteLine(Spaces + dest + " = ReadMemory(ReadWord(PC)); PC += 2;"); break;
case AddrMode.ImmAbsoluteX:
case AddrMode.AbsoluteX:
w.WriteLine(Spaces + dest + " = ReadMemory((ushort)(ReadWord(PC)+X));");
w.WriteLine(Spaces + "PC += 2;");
break;
case AddrMode.AbsoluteY:
w.WriteLine(Spaces + dest + " = ReadMemory((ushort)(ReadWord(PC)+Y));");
w.WriteLine(Spaces + "PC += 2;");
break;
case AddrMode.Indirect:
w.WriteLine(Spaces + dest + " = ReadMemory(ReadWordPageWrap((ushort)(ReadMemory(PC++)+0x2000)));"); break;
case AddrMode.IndirectX:
w.WriteLine(Spaces + dest + " = ReadMemory(ReadWordPageWrap((ushort)((byte)(ReadMemory(PC++)+X)+0x2000)));"); break;
case AddrMode.IndirectY:
w.WriteLine(Spaces + "temp16 = ReadWordPageWrap((ushort)(ReadMemory(PC++)+0x2000));");
w.WriteLine(Spaces + dest + " = ReadMemory((ushort)(temp16+Y));");
break;
default:
throw new Exception("p" + op.Instruction);
}
}
private void ORA(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "if (FlagT == false)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " A |= value8;");
w.WriteLine(Spaces + " " + SetNZ("A"));
w.WriteLine(Spaces + " PendingCycles -= {0};", op.Cycles);
w.WriteLine(Spaces + "} else {");
w.WriteLine(Spaces + " source8 = ReadMemory((ushort)(0x2000 + X));");
w.WriteLine(Spaces + " source8 |= value8;");
w.WriteLine(Spaces + " " + SetNZ("source8"));
w.WriteLine(Spaces + " WriteMemory((ushort)(0x2000 + X), source8);");
w.WriteLine(Spaces + " PendingCycles -= {0};", op.Cycles + 3);
w.WriteLine(Spaces + "}");
}
private void GetAddress(OpcodeInfo op, TextWriter w, string dest)
{
switch (op.AddressMode)
{
case AddrMode.ZeroPage:
w.WriteLine(Spaces + dest + " = (ushort)(ReadMemory(PC++)+0x2000);"); break;
case AddrMode.ZeroPageX:
w.WriteLine(Spaces + dest + " = (ushort)(((ReadMemory(PC++)+X)&0xFF)+0x2000);"); break;
case AddrMode.ZeroPageY:
w.WriteLine(Spaces + dest + " = (ushort)(((ReadMemory(PC++)+Y)&0xFF)+0x2000);"); break;
case AddrMode.Absolute:
w.WriteLine(Spaces + dest + " = ReadWord(PC); PC += 2;"); break;
case AddrMode.AbsoluteX:
w.WriteLine(Spaces + dest + " = (ushort)(ReadWord(PC)+X);");
w.WriteLine(Spaces + "PC += 2;");
break;
case AddrMode.AbsoluteY:
w.WriteLine(Spaces + dest + " = (ushort)(ReadWord(PC)+Y);");
w.WriteLine(Spaces + "PC += 2;");
break;
case AddrMode.Indirect:
w.WriteLine(Spaces + dest + " = ReadWordPageWrap((ushort)(ReadMemory(PC++)+0x2000));"); break;
case AddrMode.IndirectX:
w.WriteLine(Spaces + dest + " = ReadWordPageWrap((ushort)((byte)(ReadMemory(PC++)+X)+0x2000));"); break;
case AddrMode.IndirectY:
w.WriteLine(Spaces + "temp16 = ReadWordPageWrap((ushort)(ReadMemory(PC++)+0x2000));");
w.WriteLine(Spaces + dest + " = (ushort)(temp16+Y);");
break;
case AddrMode.Relative:
w.WriteLine(Spaces + "rel8 = (sbyte)ReadMemory(PC++);");
w.WriteLine(Spaces + dest + " = (ushort)(PC+rel8);");
break;
}
}
private void ASL(OpcodeInfo op, TextWriter w)
{
if (op.AddressMode == AddrMode.Accumulator)
{
w.WriteLine(Spaces + "FlagC = (A & 0x80) != 0;");
w.WriteLine(Spaces + "A = (byte) (A << 1);");
w.WriteLine(Spaces + SetNZ("A"));
}
else
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "value8 = ReadMemory(value16);");
w.WriteLine(Spaces + "FlagC = (value8 & 0x80) != 0;");
w.WriteLine(Spaces + "value8 = (byte)(value8 << 1);");
w.WriteLine(Spaces + "WriteMemory(value16, value8);");
w.WriteLine(Spaces + SetNZ("value8"));
}
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void ASL(OpcodeInfo op, TextWriter w)
{
if (op.AddressMode == AddrMode.Accumulator)
{
w.WriteLine(Spaces + "FlagC = (A & 0x80) != 0;");
w.WriteLine(Spaces + "A = (byte) (A << 1);");
w.WriteLine(Spaces + SetNZ("A"));
}
else
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "value8 = ReadMemory(value16);");
w.WriteLine(Spaces + "FlagC = (value8 & 0x80) != 0;");
w.WriteLine(Spaces + "value8 = (byte)(value8 << 1);");
w.WriteLine(Spaces + "WriteMemory(value16, value8);");
w.WriteLine(Spaces + SetNZ("value8"));
}
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void ROR(OpcodeInfo op, TextWriter w)
{
if (op.AddressMode == AddrMode.Accumulator)
{
w.WriteLine(Spaces + "temp8 = A;");
w.WriteLine(Spaces + "A = (byte)((A >> 1) | ((P & 1)<<7));");
w.WriteLine(Spaces + "FlagC = (temp8 & 1) != 0;");
w.WriteLine(Spaces + SetNZ("A"));
}
else
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "value8 = temp8 = ReadMemory(value16);");
w.WriteLine(Spaces + "value8 = (byte)((value8 >> 1) | ((P & 1)<<7));");
w.WriteLine(Spaces + "WriteMemory(value16, value8);");
w.WriteLine(Spaces + "FlagC = (temp8 & 1) != 0;");
w.WriteLine(Spaces + SetNZ("value8"));
}
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void SBC(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "temp = A - value8 - (FlagC ? 0 : 1);");
w.WriteLine(Spaces + "if ((P & 0x08) != 0) {");
w.WriteLine(Spaces + " lo = (A & 0x0F) - (value8 & 0x0F) - (FlagC ? 0 : 1);");
w.WriteLine(Spaces + " hi = (A & 0xF0) - (value8 & 0xF0);");
w.WriteLine(Spaces + " if ((lo & 0xF0) != 0) lo -= 0x06;");
w.WriteLine(Spaces + " if ((lo & 0x80) != 0) hi -= 0x10;");
w.WriteLine(Spaces + " if ((hi & 0x0F00) != 0) hi -= 0x60;");
w.WriteLine(Spaces + " FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0;");
w.WriteLine(Spaces + " FlagC = (hi & 0xFF00) == 0;");
w.WriteLine(Spaces + " A = (byte) ((lo & 0x0F) | (hi & 0xF0));");
w.WriteLine(Spaces + " PendingCycles--;");
w.WriteLine(Spaces + "} else {");
w.WriteLine(Spaces + " FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0;");
w.WriteLine(Spaces + " FlagC = temp >= 0;");
w.WriteLine(Spaces + " A = (byte)temp;");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + SetNZ("A"));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void BB(OpcodeInfo op, TextWriter w, int bit, bool set)
{
string filter = "";
switch (bit)
{
case 0: filter = "0x01"; break;
case 1: filter = "0x02"; break;
case 2: filter = "0x04"; break;
case 3: filter = "0x08"; break;
case 4: filter = "0x10"; break;
case 5: filter = "0x20"; break;
case 6: filter = "0x40"; break;
case 7: filter = "0x80"; break;
}
string cond = set ? "!=" : "==";
w.WriteLine(Spaces + "value8 = ReadMemory((ushort)(ReadMemory(PC++)+0x2000));");
w.WriteLine(Spaces + "rel8 = (sbyte) ReadMemory(PC++);");
w.WriteLine(Spaces + "if ((value8 & "+filter+") "+cond+" 0) {");
w.WriteLine(Spaces + " PendingCycles -= 2;");
w.WriteLine(Spaces + " PC = (ushort)(PC+rel8);");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TAM(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "for (byte reg=0; reg<8; reg++)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " if ((value8 & (1 << reg)) != 0)");
w.WriteLine(Spaces + " MPR[reg] = A;");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TDD(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "if (InBlockTransfer == false)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " InBlockTransfer = true;");
w.WriteLine(Spaces + " btFrom = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " btTo = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " btLen = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " PendingCycles -= 14;");
w.WriteLine(Spaces + " PC -= 7;");
w.WriteLine(Spaces + " break;");
w.WriteLine(Spaces + "}");
w.WriteLine();
w.WriteLine(Spaces + "if (btLen-- != 0)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " WriteMemory(btTo--, ReadMemory(btFrom--));");
w.WriteLine(Spaces + " PendingCycles -= 6;");
w.WriteLine(Spaces + " PC--;");
w.WriteLine(Spaces + " break;");
w.WriteLine(Spaces + "}");
w.WriteLine();
w.WriteLine(Spaces + "InBlockTransfer = false;");
w.WriteLine(Spaces + "PendingCycles -= 3;");
w.WriteLine(Spaces + "PC += 6;");
}
private void LDY(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "Y");
w.WriteLine(Spaces + SetNZ("Y"));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TXS(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "S = X;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void SMB(OpcodeInfo op, TextWriter w, int bit)
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "value8 = ReadMemory(value16);");
w.WriteLine(Spaces + "value8 |= 0x{0:X2};",(1<<bit));
w.WriteLine(Spaces + "WriteMemory(value16, value8);");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TXS(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "S = X;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TST(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "value8 = ReadMemory(PC++);");
GetValue8(op, w, "temp8");
w.WriteLine(Spaces + "FlagN = (temp8 & 0x80) != 0;");
w.WriteLine(Spaces + "FlagV = (temp8 & 0x40) != 0;");
w.WriteLine(Spaces + "FlagZ = (temp8 & value8) == 0;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void RTS(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "PC = ReadMemory((ushort)(++S + 0x2100));");
w.WriteLine(Spaces + "PC |= (ushort)(ReadMemory((ushort)(++S + 0x2100)) << 8);");
w.WriteLine(Spaces + "PC++;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TYA(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "A = Y;");
w.WriteLine(Spaces + SetNZ("A"));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void PLP(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "P = ReadMemory((ushort)(++S + 0x2100));");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
w.WriteLine(Spaces + "goto AfterClearTFlag;");
}
private void ROR(OpcodeInfo op, TextWriter w)
{
if (op.AddressMode == AddrMode.Accumulator)
{
w.WriteLine(Spaces + "temp8 = A;");
w.WriteLine(Spaces + "A = (byte)((A >> 1) | ((P & 1)<<7));");
w.WriteLine(Spaces + "FlagC = (temp8 & 1) != 0;");
w.WriteLine(Spaces + SetNZ("A"));
}
else
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "value8 = temp8 = ReadMemory(value16);");
w.WriteLine(Spaces + "value8 = (byte)((value8 >> 1) | ((P & 1)<<7));");
w.WriteLine(Spaces + "WriteMemory(value16, value8);");
w.WriteLine(Spaces + "FlagC = (temp8 & 1) != 0;");
w.WriteLine(Spaces + SetNZ("value8"));
}
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void PullReg(OpcodeInfo op, TextWriter w, string reg)
{
w.WriteLine(Spaces + "{0} = ReadMemory((ushort)(++S + 0x2100));", reg);
w.WriteLine(Spaces + SetNZ(reg));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void PushReg(OpcodeInfo op, TextWriter w, string reg)
{
w.WriteLine(Spaces + "WriteMemory((ushort)(S-- + 0x2100), {0});", reg);
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void ORA(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "if (FlagT == false)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " A |= value8;");
w.WriteLine(Spaces + " "+SetNZ("A"));
w.WriteLine(Spaces + " PendingCycles -= {0};", op.Cycles);
w.WriteLine(Spaces + "} else {");
w.WriteLine(Spaces + " source8 = ReadMemory((ushort)(0x2000 + X));");
w.WriteLine(Spaces + " source8 |= value8;");
w.WriteLine(Spaces + " " + SetNZ("source8"));
w.WriteLine(Spaces + " WriteMemory((ushort)(0x2000 + X), source8);");
w.WriteLine(Spaces + " PendingCycles -= {0};", op.Cycles+3);
w.WriteLine(Spaces + "}");
}
private void TAY(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "Y = A;");
w.WriteLine(Spaces + SetNZ("Y"));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void SXY(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "temp8 = X;");
w.WriteLine(Spaces + "X = Y;");
w.WriteLine(Spaces + "Y = temp8;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TMA(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + " if ((value8 & 0x01) != 0) A = MPR[0];");
w.WriteLine(Spaces + "else if ((value8 & 0x02) != 0) A = MPR[1];");
w.WriteLine(Spaces + "else if ((value8 & 0x04) != 0) A = MPR[2];");
w.WriteLine(Spaces + "else if ((value8 & 0x08) != 0) A = MPR[3];");
w.WriteLine(Spaces + "else if ((value8 & 0x10) != 0) A = MPR[4];");
w.WriteLine(Spaces + "else if ((value8 & 0x20) != 0) A = MPR[5];");
w.WriteLine(Spaces + "else if ((value8 & 0x40) != 0) A = MPR[6];");
w.WriteLine(Spaces + "else if ((value8 & 0x80) != 0) A = MPR[7];");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void SBC(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "temp = A - value8 - (FlagC ? 0 : 1);");
w.WriteLine(Spaces + "if ((P & 0x08) != 0) {");
w.WriteLine(Spaces + " lo = (A & 0x0F) - (value8 & 0x0F) - (FlagC ? 0 : 1);");
w.WriteLine(Spaces + " hi = (A & 0xF0) - (value8 & 0xF0);");
w.WriteLine(Spaces + " if ((lo & 0xF0) != 0) lo -= 0x06;");
w.WriteLine(Spaces + " if ((lo & 0x80) != 0) hi -= 0x10;");
w.WriteLine(Spaces + " if ((hi & 0x0F00) != 0) hi -= 0x60;");
w.WriteLine(Spaces + " FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0;");
w.WriteLine(Spaces + " FlagC = (hi & 0xFF00) == 0;");
w.WriteLine(Spaces + " A = (byte) ((lo & 0x0F) | (hi & 0xF0));");
w.WriteLine(Spaces + " PendingCycles--;");
w.WriteLine(Spaces + "} else {");
w.WriteLine(Spaces + " FlagV = ((A ^ value8) & (A ^ temp) & 0x80) != 0;");
w.WriteLine(Spaces + " FlagC = temp >= 0;");
w.WriteLine(Spaces + " A = (byte)temp;");
w.WriteLine(Spaces + "}");
w.WriteLine(Spaces + SetNZ("A"));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TSB(OpcodeInfo op, TextWriter w)
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "value8 = ReadMemory(value16);");
w.WriteLine(Spaces + "WriteMemory(value16, (byte)(value8 | A));");
w.WriteLine(Spaces + "FlagN = (value8 & 0x80) != 0;");
w.WriteLine(Spaces + "FlagV = (value8 & 0x40) != 0;");
w.WriteLine(Spaces + "FlagZ = (A | value8) == 0;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void SEI(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "FlagI = true;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TSX(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "X = S;");
w.WriteLine(Spaces + SetNZ("X"));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void SET(OpcodeInfo op, TextWriter w)
{
w.WriteLine(" int a; // TODO remove these extra checks"); // TODO remove these extra checks
w.WriteLine(" string b = Disassemble(PC, out a);");
w.WriteLine(" if (b.StartsWith(\"ADC\") == false && b.StartsWith(\"EOR\") == false && b.StartsWith(\"AND\") == false && b.StartsWith(\"ORA\") == false)");
w.WriteLine(" Console.WriteLine(\"SETTING T FLAG, NEXT INSTRUCTION IS UNHANDLED: {0}\", b);");
w.WriteLine(Spaces + "FlagT = true;");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
w.WriteLine(Spaces + "goto AfterClearTFlag;");
}
private void TYA(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "A = Y;");
w.WriteLine(Spaces + SetNZ("A"));
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void ST2(OpcodeInfo op, TextWriter w)
{
GetValue8(op, w, "value8");
w.WriteLine(Spaces + "WriteVDC(3,value8);");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void TIA(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "if (InBlockTransfer == false)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " InBlockTransfer = true;");
w.WriteLine(Spaces + " btFrom = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " btTo = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " btLen = ReadWord(PC); PC += 2;");
w.WriteLine(Spaces + " btAlternator = 0;");
w.WriteLine(Spaces + " PendingCycles -= 14;");
w.WriteLine(Spaces + " PC -= 7;");
w.WriteLine(Spaces + " break;");
w.WriteLine(Spaces + "}");
w.WriteLine();
w.WriteLine(Spaces + "if (btLen-- != 0)");
w.WriteLine(Spaces + "{");
w.WriteLine(Spaces + " WriteMemory((ushort)(btTo+btAlternator), ReadMemory(btFrom++));");
w.WriteLine(Spaces + " btAlternator ^= 1;");
w.WriteLine(Spaces + " PendingCycles -= 6;");
w.WriteLine(Spaces + " PC--;");
w.WriteLine(Spaces + " break;");
w.WriteLine(Spaces + "}");
w.WriteLine();
w.WriteLine(Spaces + "InBlockTransfer = false;");
w.WriteLine(Spaces + "PendingCycles -= 3;");
w.WriteLine(Spaces + "PC += 6;");
}
private void STZ(OpcodeInfo op, TextWriter w)
{
GetAddress(op, w, "value16");
w.WriteLine(Spaces + "WriteMemory(value16, 0);");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void JMP(OpcodeInfo op, TextWriter w)
{
switch (op.AddressMode)
{
case AddrMode.Absolute: w.WriteLine(Spaces + "PC = ReadWord(PC);"); break;
case AddrMode.AbsoluteIndirect: w.WriteLine(Spaces + "PC = ReadWord(ReadWord(PC));"); break;
case AddrMode.AbsoluteIndirectX: w.WriteLine(Spaces + "PC = ReadWord((ushort)(ReadWord(PC)+X));"); break;
}
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
private void JSR(OpcodeInfo op, TextWriter w)
{
w.WriteLine(Spaces + "temp16 = (ushort)(PC+1);");
w.WriteLine(Spaces + "WriteMemory((ushort)(S-- + 0x2100), (byte)(temp16 >> 8));");
w.WriteLine(Spaces + "WriteMemory((ushort)(S-- + 0x2100), (byte)temp16);");
w.WriteLine(Spaces + "PC = ReadWord(PC);");
w.WriteLine(Spaces + "PendingCycles -= {0};", op.Cycles);
}
