public Instruction[] Disassemble(int address, int count)
{
List <Instruction> opcodes = new List <Instruction>();
int ptr = address;
for (int i = 0; i < count; i++)
{
int pc = ptr;
byte opcode = this._memory.ReadByte(ptr);
string prototype;
if (opcode == 0xCB)
{
ptr++;
opcode = this._memory.ReadByte(ptr);
prototype = _prototypes_cb[opcode];
}
else
{
prototype = _prototypes[opcode];
}
ptr++;
if (prototype.Contains("d8"))
{
prototype = prototype.Replace("d8", string.Format("0x{0:X2}", _memory.ReadByte(ptr)));
ptr++;
}
if (prototype.Contains("d16"))
{
prototype = prototype.Replace("d16", string.Format("0x{0:X4}", (_memory.ReadByte(ptr + 1) << 8) + _memory.ReadByte(ptr)));
ptr += 2;
}
if (prototype.Contains("a8"))
{
prototype = prototype.Replace("a8", string.Format("0x{0:X4}", 0xff00 + _memory.ReadByte(ptr)));
ptr++;
}
if (prototype.Contains("a16"))
{
prototype = prototype.Replace("a16", string.Format("0x{0:X4}", (_memory.ReadByte(ptr + 1) << 8) + _memory.ReadByte(ptr)));
ptr += 2;
}
if (prototype.Contains("r8"))
{
int value = _memory.ReadByte(ptr);
if (value > 0x7F)
{
value -= 256;
}
prototype = prototype.Replace("r8", string.Format("0x{0:X4}", ptr + value + 1));
ptr++;
}
opcodes.Add(new Instruction(prototype, pc, ptr - pc));
}
return(opcodes.ToArray());
}
public byte ReadByte(int address)
{
if (address <= 0x7FFF)
{
return(mbc.ReadByte(address));
}
else if (address <= 0x9FFF)
{
return(Video.ReadVRAM(address - 0x8000));
}
else if (address <= 0xBFFF)
{
return(mbc.ReadByte(address));
}
else if (address <= 0xCFFF)
{
return(wram[0, address - 0xC000]);
}
else if (address <= 0xDFFF)
{
return(wram[wrambank, address - 0xD000]);
}
else if (address <= 0xEFFF)
{
return(wram[0, address - 0xE000]);
}
else if (address <= 0xFDFF)
{
return(wram[wrambank, address - 0xF000]);
}
else if (address <= 0xFE9F)
{
return(Video.ReadOAM(address - 0xFE00));
}
else if (address <= 0xFEFF)
{
// Not usable
return(0);
}
else if (address <= 0xFF7F)
{
int value = 0;
switch (address - 0xFF00)
{
case 0x00: // Joypad
value = Joypad.SelectButtonKeys ? 0x00 : 0x20;
value += Joypad.SelectDirectionKeys ? 0x00 : 0x10;
if (Joypad.SelectButtonKeys)
{
value += Joypad.KeyB ? 0x02 : 0x00;
value += Joypad.KeyA ? 0x01 : 0x00;
}
else
{
value += Joypad.KeyLeft ? 0x02 : 0x00;
value += Joypad.KeyRight ? 0x01 : 0x00;
}
if (Joypad.SelectDirectionKeys)
{
value += Joypad.KeyDown ? 0x08 : 0x00;
value += Joypad.KeyUp ? 0x04 : 0x00;
}
else
{
value += Joypad.KeyStart ? 0x08 : 0x00;
value += Joypad.KeySelect ? 0x04 : 0x00;
}
return((byte)value);
case 0x01: // SB Serial transfer data
return(serial.Read());
case 0x04: // Divider Register
return((byte)Timer.DIV);
case 0x05: // Timer Counter
return((byte)Timer.TIMA);
case 0x06: // Timer Modulo
return((byte)Timer.TMA);
case 0x07: // Timer Control
return((byte)Timer.TAC);
case 0x0F: // Interrupt Flag
return((byte)Interrupt.IF);
case 0x10: // NR10 Channel 1 Sweep register
value = Audio.Channel1.SweepShift |
((int)Audio.Channel1.SweepDirection << 3) |
(Audio.Channel1.SweepTime << 4);
return((byte)value);
case 0x11: // NR11 Channel 1 Sound length/Wave pattern duty
value = Audio.Channel1.SoundLengthRaw |
(Audio.Channel1.WavePatternDuty << 6);
return((byte)value);
case 0x12: // NR12 Channel 1 Volume Envelope
value = Audio.Channel1.EnvelopeSweep |
((int)Audio.Channel1.EnvelopeDirection << 3) |
(Audio.Channel1.Volume << 4);
return((byte)value);
case 0x14: // NR14 Channel 1 Frequency hi
return((byte)(Audio.Channel1.StopOnLengthExpired ? 0x40 : 0x00));
case 0x16: // NR21 Channel 2 Sound length/Wave pattern duty
value = Audio.Channel2.SoundLengthRaw |
(Audio.Channel2.WavePatternDuty << 6);
return((byte)value);
case 0x17: // NR22 Channel 2 Volume Envelope
value = Audio.Channel2.EnvelopeSweep |
((int)Audio.Channel2.EnvelopeDirection << 3) |
(Audio.Channel2.Volume << 4);
return((byte)value);
case 0x19: // NR24 Channel 2 Frequency hi
return((byte)(Audio.Channel2.StopOnLengthExpired ? 0x40 : 0x00));
case 0x1A: // NR30 Channel 3 Sound on/off
return((byte)(Audio.Channel3.On ? 0x80 : 0x00));
case 0x1B: // NR31 Channel 3 Sound Length
return((byte)Audio.Channel3.SoundLengthRaw);
case 0x1C: // NR32 Channel 3 Select output level
return((byte)(Audio.Channel3.OutputLevel << 5));
case 0x1E: // NR33 Channel 3 Frequency hi
return((byte)(Audio.Channel3.StopOnLengthExpired ? 0x40 : 0x00));
case 0x20:
case 0x21:
case 0x22:
case 0x23: throw new NotImplementedException();
// FF30-FF3F Wave Pattern RAM
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
case 0x3A:
case 0x3B:
case 0x3C:
case 0x3D:
case 0x3E:
case 0x3F:
value = Audio.Channel3.WaveRAM[(address & 0xF) * 2 + 1] |
(Audio.Channel3.WaveRAM[(address & 0xF) * 2] << 4);
return((byte)value);
case 0x40: // LCDC
value = Video.LCDEnable ? 0x80 : 0x0;
value += Video.WindowTileMapSelect ? 0x40 : 0x0;
value += Video.WindowEnable ? 0x20 : 0x0;
value += Video.TileDataSelect ? 0x10 : 0x0;
value += Video.BackgroundTileMapSelect ? 0x08 : 0x0;
value += Video.ObjectSize ? 0x04 : 0x0;
value += Video.ObjectEnable ? 0x02 : 0x0;
value += Video.BackgroundEnable ? 0x01 : 0x0;
return((byte)value);
case 0x41: // LCDC STAT
value = Video.CoincidenceInterrupt ? 0x40 : 0x0;
value += Video.OAMInterrupt ? 0x20 : 0x0;
value += Video.VBlankInterrupt ? 0x10 : 0x0;
value += Video.HBlankInterrupt ? 0x08 : 0x0;
value += Video.CoincidenceFlag ? 0x04 : 0x0;
value += Video.ModeFlag & 0x03;
return((byte)value);
case 0x42: // SCY
return((byte)Video.SCY);
case 0x43: // SCX
return((byte)Video.SCX);
case 0x44: // LY
return((byte)Video.LY);
case 0x45: // LYC
return((byte)Video.LYC);
case 0x47: // BGP
return((byte)Video.BGP);
case 0x48: // OBP0
return((byte)Video.OBP0);
case 0x49: // OBP1
return((byte)Video.OBP1);
case 0x4A: // WY
return((byte)Video.WY);
case 0x4B: // WX
return((byte)Video.WX);
case 0x4D: // Prepare Speed Switch
value = cpu.IsDoubleSpeed ? 0x80 : 0x00;
value |= cpu.PrepareSpeedSwitch ? 1 : 0;
return((byte)value);
case 0x4F: // VRAM bank
return((byte)Video.VRAMBank);
case 0x51: // HDMA Source, High
return((byte)(hdma.SourceAddress >> 8));
case 0x52: // HDMA Source, Low
return((byte)hdma.SourceAddress);
case 0x53: // HDMA Destination, High
return((byte)(hdma.DestinationAddress >> 8));
case 0x54: // HDMA Destination, Low
return((byte)hdma.DestinationAddress);
case 0x55: // HDMA Length/Mode/Start
value = (hdma.Length / 0x10 - 1) |
(hdma.IsHBlank ? 0x80 : 0x00);
return((byte)value);
case 0x68: // Background Palette Index
value = Video.BackgroundPaletteIndex;
value |= Video.BackgroundPaletteAI ? 0x80 : 0x00;
return((byte)value);
case 0x69: // Background Palette Data
return(Video.ReadPRAM(0));
case 0x6A: // Object Palette Index
value = Video.ObjectPaletteIndex;
value |= Video.ObjectPaletteAI ? 0x80 : 0x00;
return((byte)value);
case 0x6B: // Object Palette Data
return(Video.ReadPRAM(1));
case 0x70: // WRAM bank
return((byte)wrambank);
default:
//throw new Exception(string.Format("Unknown IO port at 0x{0:X} (READ)", address));
return(0);
}
}
else if (address <= 0xFFFE)
{
return(hram[address - 0xFF80]);
}
else
{
return((byte)Interrupt.IE);
}
}
