static void Main(string[] args)
{
state = new State();
state.LoadRom(@"c:\invaders");
Thread emulatorThread = new Thread(new ThreadStart(state.Run));
emulatorThread.Start();
mainWindow = new MainWindow();
Application.Run(mainWindow);
}
public Registers(State s) : this()
{
state = s;
state.parityTable = new int[] {
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1
};
}
public void pchl(State state)
{
state.cycleCount += 5;
state.memory.pc = state.registers.HL;
}
public void cmp(State state)
{
state.cycleCount += 4;
int src = (state.currentOpcode & 0x7);
int result = state.registers.A - state.registers.ReadByte(src);
state.registers.SetFlags((byte)Flag.SIGN | (byte)Flag.ZERO | (byte)Flag.PARITY | (byte)Flag.ACARRY | (byte)Flag.CARRY, state.registers.A, result);
}
public void pop(State state)
{
state.cycleCount += 10;
int dst = (state.currentOpcode >> 4) & 0x03;
ushort value = state.stack.Pop();
state.registers.WriteWord(dst, value);
}
public void ori(State state)
{
state.cycleCount += 7;
byte value = state.memory.ReadByte();
int result = state.registers.A | value;
state.registers.SetFlags((byte)Flag.SIGN | (byte)Flag.ZERO | (byte)Flag.PARITY | (byte)Flag.ACARRY | (byte)Flag.CARRY, state.registers.A, result);
state.registers.A = (byte)result;
}
public void sbi(State state)
{
state.cycleCount += 7;
int result;
byte value = state.memory.ReadByte();
if(state.registers.GetFlag(Flag.CARRY))
{
result = state.registers.A - (value - 1);
} else
{
result = state.registers.A - value;
}
state.registers.SetFlags((byte)Flag.SIGN | (byte)Flag.ZERO | (byte)Flag.PARITY | (byte)Flag.ACARRY | (byte)Flag.CARRY, state.registers.A, result);
state.registers.A = (byte) result;
}
public void cnc(State state)
{
if (!state.registers.GetFlag(Flag.CARRY))
{
call(state);
}
else
{
state.memory.pc += 2;
state.cycleCount += 11;
}
}
public void lhld(State state)
{
state.cycleCount += 16;
ushort address = state.memory.ReadWord();
ushort value = state.memory.ReadWordAt(address);
state.registers.HL = value;
}
public void output(State state)
{
state.cycleCount += 10;
byte port = state.memory.ReadByte();
switch (port)
{
case 2:
state.port2 = state.registers.A;
break;
case 3:
if (((state.registers.A & (1 << 3)) > 0) && ((state.port3o & (1 << 3)) == 0))
{
//state.soundInvaderKilled.Play();
}
state.port3o = state.registers.A;
break;
case 4:
state.port4LO = state.port4HI;
state.port4HI = state.registers.A;
break;
case 5:
break;
case 6:
// Watchdog for reset, not implemented.
break;
default:
state.DumpState();
Console.WriteLine("Unhandled OUT {0}", port);
Console.ReadLine();
break;
}
}
public void ei(State state)
{
state.cycleCount += 4;
state.registers.F |= Flag.INTERRUPT;
}
public void sta(State state)
{
state.cycleCount += 13;
ushort address = state.memory.ReadWord();
state.memory.WriteByte(address, state.registers.A);
}
public void input(State state)
{
state.cycleCount += 10;
byte port = state.memory.ReadByte();
switch (port)
{
case 1:
state.registers.A = (byte)state.inp1;
break;
case 2:
state.registers.A = (byte)state.inp2;
break;
case 3:
state.registers.A = (byte)((((state.port4HI << 8) | state.port4LO) << state.port2) >> 8);
break;
default:
break;
}
}
public void lda(State state)
{
state.cycleCount += 13;
ushort address = state.memory.ReadWord();
byte value = state.memory.ReadByteAt(address);
state.registers.A = value;
}
public void adc(State state)
{
state.cycleCount += 4;
int src = (state.currentOpcode & 0x7);
byte value = state.registers.ReadByte(src);
int result = state.registers.A + value + (state.registers.F & (byte)Flag.CARRY);
state.registers.SetFlags((byte)Flag.SIGN | (byte)Flag.ZERO | (byte)Flag.PARITY | (byte)Flag.ACARRY | (byte)Flag.CARRY, value, result);
state.registers.A = (byte)result;
}
public void rrc(State state)
{
state.cycleCount += 4;
if((state.registers.A & 1) != 0)
{
state.registers.F |= Flag.CARRY;
} else
{
state.registers.F &= unchecked((byte)~Flag.CARRY);
}
int result = (state.registers.A >> 1) | ((state.registers.F & Flag.CARRY) << 7 );
state.registers.A = (byte)result;
}
public void dcx(State state)
{
state.cycleCount += 5;
int dst = (state.currentOpcode >> 4) & 0x03;
int value = state.registers.ReadWord(dst);
int result = value - 1;
state.registers.WriteWord(dst, (ushort) result);
}
public void jc(State state)
{
state.cycleCount += 10;
ushort address = state.memory.ReadWord();
if (state.registers.GetFlag(Flag.CARRY))
{
state.memory.pc = address;
}
}
public void rlc(State state)
{
state.cycleCount += 4;
if (((int)state.registers.A & (1 << 7)) != 0)
{
state.registers.F |= Flag.CARRY;
}
else
{
state.registers.F &= unchecked((byte)~Flag.CARRY);
}
int result = (state.registers.A << 1) | (state.registers.F & Flag.CARRY);
state.registers.A = (byte)result;
}
/*
This BCD stuff is like black magic to me, implemented by looking at similar emulators.
*/
public void daa(State state)
{
state.cycleCount += 4;
int top4 = (state.registers.A >> 4) & 0xf;
int bot4 = (state.registers.A & 0xf);
if ((bot4 > 9) || state.registers.GetFlag(Flag.ACARRY)) {
state.registers.SetFlags((byte)Flag.SIGN | (byte)Flag.ZERO | (byte)Flag.PARITY | (byte)Flag.ACARRY | (byte)Flag.CARRY, state.registers.A, state.registers.A + 6);
state.registers.A += 6;
top4 = (state.registers.A >> 4) & 0xF;
bot4 = (state.registers.A & 0xf);
}
if((top4 > 9) || state.registers.GetFlag(Flag.CARRY))
{
top4 += 6;
state.registers.SetFlags((byte)Flag.SIGN | (byte)Flag.ZERO | (byte)Flag.PARITY | (byte)Flag.ACARRY | (byte)Flag.CARRY, state.registers.A, (((top4 << 4) | bot4)));
state.registers.A = (byte)(((top4 << 4) | bot4));
}
}
public void cz(State state)
{
if (state.registers.GetFlag(Flag.ZERO))
{
call(state);
}
else
{
state.memory.pc += 2;
state.cycleCount += 11;
}
}
public void rnz(State state)
{
if (!state.registers.GetFlag(Flag.ZERO))
{
state.cycleCount += 1;
ret(state);
}
else
{
state.cycleCount += 5;
}
}
public void rar(State state)
{
state.cycleCount += 4;
int temp = state.registers.A;
state.registers.A >>= 1;
if(state.registers.GetFlag(Flag.CARRY))
{
state.registers.A |= 0x80;
}
if((temp & 1) > 0)
{
state.registers.F |= Flag.CARRY;
} else
{
state.registers.F &= unchecked((byte)~Flag.CARRY);
}
}
public void stc(State state)
{
state.cycleCount += 4;
state.registers.F |= Flag.CARRY;
}
public void shld(State state)
{
state.cycleCount += 16;
ushort address = state.memory.ReadWord();
state.memory.WriteWord(address, state.registers.HL);
}
public void dad(State state)
{
state.cycleCount += 10;
int src = (state.currentOpcode >> 4) & 0x03;
int dst = state.registers.ReadWord(2);
int value = state.registers.ReadWord(src);
int result = dst + value;
if (result > 0xffff)
{
state.registers.F |= Flag.CARRY;
} else
{
state.registers.F &= unchecked((byte)~Flag.CARRY);
}
state.registers.WriteWord(2, (ushort)result);
}
public void cma(State state)
{
state.cycleCount += 4;
state.registers.A = (byte) ~(state.registers.A);
}
public void xthl(State state)
{
state.cycleCount += 18;
ushort value = state.stack.Pop();
state.stack.Push(state.registers.HL);
state.registers.HL = value;
}
public void rc(State state)
{
if (state.registers.GetFlag(Flag.CARRY))
{
state.cycleCount += 1;
ret(state);
}
else
{
state.cycleCount += 5;
}
}
public void xchg(State state)
{
state.cycleCount += 5;
ushort hl = state.registers.ReadWord(2);
ushort de = state.registers.ReadWord(1);
state.registers.WriteWord(2, de);
state.registers.WriteWord(1, hl);
}
