public void WriteByte(int address, byte value)
{
if (address <= 0x7FFF)
{
mbc.WriteByte(address, value);
}
else if (address <= 0x9FFF)
{
Video.WriteVRAM(address - 0x8000, value);
}
else if (address <= 0xBFFF)
{
mbc.WriteByte(address, value);
}
else if (address <= 0xCFFF)
{
wram[0, address - 0xC000] = value;
}
else if (address <= 0xDFFF)
{
wram[wrambank, address - 0xD000] = value;
}
else if (address <= 0xEFFF)
{
wram[0, address - 0xE000] = value;
}
else if (address <= 0xFDFF)
{
wram[wrambank, address - 0xF000] = value;
}
else if (address <= 0xFE9F)
{
Video.WriteOAM(address - 0xFE00, value);
}
else if (address <= 0xFEFF)
{
// Not usable
}
else if (address <= 0xFF7F)
{
switch (address - 0xFF00)
{
case 0x00: // Joypad
Joypad.SelectButtonKeys = ((value >> 5) & 1) == 0;
Joypad.SelectDirectionKeys = ((value >> 4) & 1) == 0;
break;
case 0x01: // SB Serial transfer data
serial.Write(value);
break;
case 0x02: // SC Serial Transfer Control
if ((value & 0x80) == 0x80)
{
serial.Start();
}
break;
case 0x04: // Divider Register
Timer.DIV = 0;
break;
case 0x05: // Timer Counter
Timer.TIMA = value;
break;
case 0x06: // Timer Modulo
Timer.TMA = value;
break;
case 0x07: // Timer Control
Timer.TAC = value;
break;
case 0x0F: // Interrupt Flag
Interrupt.IF = value;
break;
case 0x10: // NR10 Channel 1 Sweep register
Audio.Channel1.SweepShift = value & 7;
Audio.Channel1.SweepDirection = (SweepMode)((value >> 3) & 1);
Audio.Channel1.SweepTime = (value >> 4) & 7;
break;
case 0x11: // NR11 Channel 1 Sound length/Wave pattern duty
Audio.Channel1.SoundLengthRaw = value & 0x3F;
Audio.Channel1.WavePatternDuty = (value >> 6) & 3;
break;
case 0x12: // NR12 Channel 1 Volume Envelope
Audio.Channel1.EnvelopeSweep = value & 7;
Audio.Channel1.EnvelopeDirection = (EnvelopeMode)((value >> 3) & 1);
Audio.Channel1.Volume = (value >> 4) & 0xF;
break;
case 0x13: // NR13 Channel 1 Frequency lo
Audio.Channel1.Frequency = (Audio.Channel1.Frequency & 0x700) | value;
break;
case 0x14: // NR14 Channel 1 Frequency hi
Audio.Channel1.Frequency = (Audio.Channel1.Frequency & 0xFF) | ((value & 7) << 8);
Audio.Channel1.StopOnLengthExpired = (value & 0x40) == 0x40;
if ((value & 0x80) == 0x80)
{
Audio.Channel1.Restart();
}
break;
case 0x16: // NR16 Channel 2 Sound length/Wave pattern duty
Audio.Channel2.SoundLengthRaw = value & 0x3F;
Audio.Channel2.WavePatternDuty = (value >> 6) & 3;
break;
case 0x17: // NR17 Channel 2 Volume Envelope
Audio.Channel2.EnvelopeSweep = value & 7;
Audio.Channel2.EnvelopeDirection = (EnvelopeMode)((value >> 3) & 1);
Audio.Channel2.Volume = (value >> 4) & 0xF;
break;
case 0x18: // NR18 Channel 2 Frequency lo
Audio.Channel2.Frequency = (Audio.Channel2.Frequency & 0x700) | value;
break;
case 0x19: // NR19 Channel 2 Frequency hi
Audio.Channel2.Frequency = (Audio.Channel2.Frequency & 0xFF) | ((value & 7) << 8);
Audio.Channel2.StopOnLengthExpired = (value & 0x40) == 0x40;
if ((value & 0x80) == 0x80)
{
Audio.Channel2.Restart();
}
break;
case 0x1A: // NR30 Channel 3 Sound on / off
Audio.Channel3.On = (value & 0x80) == 0x80;
break;
case 0x1B: // NR31 Channel 3 Sound Length
Audio.Channel3.SoundLengthRaw = value;
break;
case 0x1c: // NR32 Channel 3 Select output level
Audio.Channel3.OutputLevel = (value >> 5) & 3;
break;
case 0x1D: // NR33 Channel 3 Frequency lo
Audio.Channel3.FrequencyRaw = (Audio.Channel3.FrequencyRaw & 0x700) | value;
break;
case 0x1E: // NR34 Channel 3 Frequency hi
Audio.Channel3.FrequencyRaw = (Audio.Channel3.FrequencyRaw & 0xFF) | ((value & 7) << 8);
Audio.Channel3.StopOnLengthExpired = (value & 0x40) == 0x40;
if ((value & 0x80) == 0x80)
{
Audio.Channel3.Restart();
}
break;
case 0x20: // NR41 Channel 4 Sound Length
Audio.Channel4.SoundLengthRaw = value;
break;
case 0x21: // NR42 Channel 4 Volume Envelope
Audio.Channel4.EnvelopeSweep = value & 7;
Audio.Channel4.EnvelopeDirection = (EnvelopeMode)((value >> 3) & 1);
Audio.Channel4.Volume = (value >> 4) & 0xF;
break;
case 0x22: // NR43 Channel 4 Polynomial Counter
Audio.Channel4.ClockFrequency = value >> 4;
Audio.Channel4.CounterStep = (value & 8) == 8;
Audio.Channel4.Counter = Audio.Channel4.CounterStep ? 0x7F : 0x7FFF;
Audio.Channel4.DividingRatio = value & 7;
break;
case 0x23: // NR44 Channel 4 Counter/consecutive; Initial
Audio.Channel4.StopOnLengthExpired = (value & 0x40) == 0x40;
if ((value & 0x80) == 0x80)
{
Audio.Channel4.Restart();
}
break;
// 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:
Audio.Channel3.WaveRAM[(address & 0xF) * 2] = (byte)(value >> 4);
Audio.Channel3.WaveRAM[(address & 0xF) * 2 + 1] = (byte)(value & 0xF);
break;
case 0x40: // LCDC
Video.LCDEnable = ((value >> 7) & 1) == 1;
Video.WindowTileMapSelect = ((value >> 6) & 1) == 1;
Video.WindowEnable = ((value >> 5) & 1) == 1;
Video.TileDataSelect = ((value >> 4) & 1) == 1;
Video.BackgroundTileMapSelect = ((value >> 3) & 1) == 1;
Video.ObjectSize = ((value >> 2) & 1) == 1;
Video.ObjectEnable = ((value >> 1) & 1) == 1;
Video.BackgroundEnable = (value & 1) == 1;
break;
case 0x41: // LCDC STAT
Video.CoincidenceInterrupt = ((value >> 6) & 1) == 1;
Video.OAMInterrupt = ((value >> 5) & 1) == 1;
Video.VBlankInterrupt = ((value >> 4) & 1) == 1;
Video.HBlankInterrupt = ((value >> 3) & 1) == 1;
Video.CoincidenceFlag = ((value >> 2) & 1) == 1;
Video.ModeFlag = value & 3;
break;
case 0x42: // SCY
Video.SCY = value;
break;
case 0x43: // SCX
Video.SCX = value;
break;
case 0x45: // LYC
Video.LYC = value;
break;
case 0x46: // OAM DMA
int address2 = value << 8;
for (int i = 0; i < 0x9F; i++)
{
WriteByte(0xFE00 + i, ReadByte(address2 + i));
}
break;
case 0x47: // BGP
Video.BGP = value;
break;
case 0x48: // OBP0
Video.OBP0 = value;
break;
case 0x49: // OBP1
Video.OBP1 = value;
break;
case 0x4A: // WY
Video.WY = value;
break;
case 0x4B: // WX
Video.WX = value;
break;
case 0x4D: // Prepare Speed Switch
cpu.PrepareSpeedSwitch = (value & 1) == 1;
break;
case 0x4F: // VRAM bank
if (rom.HasColorFeatures)
{
Video.VRAMBank = value & 1;
}
break;
case 0x51: // HDMA Source, High
hdma.SourceAddress = hdma.SourceAddress & 0xFF | (value << 8);
break;
case 0x52: // HDMA Source, Low
hdma.SourceAddress = hdma.SourceAddress & 0xFF00 | (value & 0xF0);
break;
case 0x53: // HDMA Destination, High
hdma.DestinationAddress = hdma.DestinationAddress & 0xFF | ((value & 0x1F) << 8);
break;
case 0x54: // HDMA Destination, Low
hdma.DestinationAddress = hdma.DestinationAddress & 0xFF00 | (value & 0xF0);
break;
case 0x55: // HDMA Length/Mode/Start
hdma.Length = ((value & 0x7F) + 1) * 0x10;
hdma.IsHBlank = (value & 0x80) == 0x80;
if (!hdma.IsHBlank)
{
hdma.PerformGeneralPurpose();
}
break;
case 0x68: // Background Palette Index
Video.BackgroundPaletteIndex = value & 0x3F;
Video.BackgroundPaletteAI = (value & 0x80) == 0x80;
break;
case 0x69: // Background Palette Data
Video.WritePRAM(0, value);
break;
case 0x6A: // Object Palette Index
Video.ObjectPaletteIndex = value & 0x3F;
Video.ObjectPaletteAI = (value & 0x80) == 0x80;
break;
case 0x6B: // Object Palette Data
Video.WritePRAM(1, value);
break;
case 0x70: // WRAM bank
if (rom.HasColorFeatures)
{
if (value == 0)
{
value = 1;
}
wrambank = value & 7;
}
break;
default:
//throw new Exception(string.Format("Unknown IO port at 0x{0:X} (WRITE)", address));
break;
}
}
else if (address <= 0xFFFE)
{
hram[address - 0xFF80] = value;
}
else
{
Interrupt.IE = value;
}
}
