public void WriteByte( int address, int value ) {
if( address >= 0xC000 && address <= 0xDFFF ) {
workRam[ address - 0xC000 ] = (byte)value;
} else if( address >= 0xFE00 && address <= 0xFEFF ) {
oam[ address - 0xFE00 ] = (byte)value;
} else if( address >= 0xFF80 && address <= 0xFFFE ) {
highRam[ 0xFF & address ] = (byte)value;
} else if( address >= 0x8000 && address <= 0x9FFF ) {
int videoRamIndex = address - 0x8000;
videoRam[ videoRamIndex ] = (byte)value;
if( address < 0x9000 ) {
spriteTileInvalidated[ videoRamIndex >> 4 ] = true;
}
if( address < 0x9800 ) {
invalidateAllBackgroundTilesRequest = true;
} else if( address >= 0x9C00 ) {
int tileIndex = address - 0x9C00;
backgroundTileInvalidated[ tileIndex >> 5, tileIndex & 0x1F ] = true;
} else {
int tileIndex = address - 0x9800;
backgroundTileInvalidated[ tileIndex >> 5, tileIndex & 0x1F ] = true;
}
} else if( address <= 0x7FFF || ( address >= 0xA000 && address <= 0xBFFF ) ) {
cartridge.WriteByte( address, value );
} else if( address >= 0xE000 && address <= 0xFDFF ) {
workRam[ address - 0xE000 ] = (byte)value;
} else {
switch( address ) {
case 0xFF00: // key pad
keyP14 = ( value & 0x10 ) != 0x10;
keyP15 = ( value & 0x20 ) != 0x20;
break;
case 0xFF04: // Timer divider
break;
case 0xFF05: // Timer counter
timerCounter = value;
break;
case 0xFF06: // Timer modulo
timerModulo = value;
break;
case 0xFF07: // Time Control
timerRunning = ( value & 0x04 ) == 0x04;
timerFrequency = (TimerFrequencyType)( 0x03 & value );
break;
case 0xFF0F: // Interrupt Flag (an interrupt request)
keyPressedInterruptRequested = ( value & 0x10 ) == 0x10;
serialIOTransferCompleteInterruptRequested = ( value & 0x08 ) == 0x08;
timerOverflowInterruptRequested = ( value & 0x04 ) == 0x04;
lcdcInterruptRequested = ( value & 0x02 ) == 0x02;
vBlankInterruptRequested = ( value & 0x01 ) == 0x01;
break;
case 0xFF40: { // LCDC control
bool _backgroundAndWindowTileDataSelect = backgroundAndWindowTileDataSelect;
bool _backgroundTileMapDisplaySelect = backgroundTileMapDisplaySelect;
bool _windowTileMapDisplaySelect = windowTileMapDisplaySelect;
lcdControlOperationEnabled = ( value & 0x80 ) == 0x80;
windowTileMapDisplaySelect = ( value & 0x40 ) == 0x40;
windowDisplayed = ( value & 0x20 ) == 0x20;
backgroundAndWindowTileDataSelect = ( value & 0x10 ) == 0x10;
backgroundTileMapDisplaySelect = ( value & 0x08 ) == 0x08;
largeSprites = ( value & 0x04 ) == 0x04;
spritesDisplayed = ( value & 0x02 ) == 0x02;
backgroundDisplayed = ( value & 0x01 ) == 0x01;
if( _backgroundAndWindowTileDataSelect != backgroundAndWindowTileDataSelect
|| _backgroundTileMapDisplaySelect != backgroundTileMapDisplaySelect
|| _windowTileMapDisplaySelect != windowTileMapDisplaySelect ) {
invalidateAllBackgroundTilesRequest = true;
}
break;
}
case 0xFF41: // LCDC Status
lcdcLycLyCoincidenceInterruptEnabled = ( value & 0x40 ) == 0x40;
lcdcOamInterruptEnabled = ( value & 0x20 ) == 0x20;
lcdcVBlankInterruptEnabled = ( value & 0x10 ) == 0x10;
lcdcHBlankInterruptEnabled = ( value & 0x08 ) == 0x08;
lcdcMode = (LcdcModeType)( value & 0x03 );
break;
case 0xFF42: // Scroll Y;
scrollY = value;
break;
case 0xFF43: // Scroll X;
scrollX = value;
break;
case 0xFF44: // LY
ly = value;
break;
case 0xFF45: // LY Compare
lyCompare = value;
break;
case 0xFF46: // Memory Transfer
value <<= 8;
for( int i = 0; i < 0x8C; i++ ) {
WriteByte( 0xFE00 | i, ReadByte( value | i ) );
}
break;
case 0xFF47: // Background palette
Console.WriteLine( "[0xFF47] = {0:X}", value );
for( int i = 0; i < 4; i++ ) {
switch( value & 0x03 ) {
case 0:
backgroundPalette[ i ] = WHITE;
break;
case 1:
backgroundPalette[ i ] = LIGHT_GRAY;
break;
case 2:
backgroundPalette[ i ] = DARK_GRAY;
break;
case 3:
backgroundPalette[ i ] = BLACK;
break;
}
value >>= 2;
}
invalidateAllBackgroundTilesRequest = true;
break;
case 0xFF48: // Object palette 0
for( int i = 0; i < 4; i++ ) {
switch( value & 0x03 ) {
case 0:
objectPalette0[ i ] = WHITE;
break;
case 1:
objectPalette0[ i ] = LIGHT_GRAY;
break;
case 2:
objectPalette0[ i ] = DARK_GRAY;
break;
case 3:
objectPalette0[ i ] = BLACK;
break;
}
value >>= 2;
}
invalidateAllSpriteTilesRequest = true;
break;
case 0xFF49: // Object palette 1
for( int i = 0; i < 4; i++ ) {
switch( value & 0x03 ) {
case 0:
objectPalette1[ i ] = WHITE;
break;
case 1:
objectPalette1[ i ] = LIGHT_GRAY;
break;
case 2:
objectPalette1[ i ] = DARK_GRAY;
break;
case 3:
objectPalette1[ i ] = BLACK;
break;
}
value >>= 2;
}
invalidateAllSpriteTilesRequest = true;
break;
case 0xFF4A: // Window Y
windowY = value;
break;
case 0xFF4B: // Window X
windowX = value;
break;
case 0xFFFF: // Interrupt Enable
keyPressedInterruptEnabled = ( value & 0x10 ) == 0x10;
serialIOTransferCompleteInterruptEnabled = ( value & 0x08 ) == 0x08;
timerOverflowInterruptEnabled = ( value & 0x04 ) == 0x04;
lcdcInterruptEnabled = ( value & 0x02 ) == 0x02;
vBlankInterruptEnabled = ( value & 0x01 ) == 0x01;
break;
}
}
}
public void WriteByte(int address, int value)
{
if (address >= 0xC000 && address <= 0xDFFF)
{
workRam [address - 0xC000] = (byte)value;
} else if (address >= 0xFE00 && address <= 0xFEFF)
{
oam [address - 0xFE00] = (byte)value;
} else if (address >= 0xFF80 && address <= 0xFFFE)
{
highRam [0xFF & address] = (byte)value;
} else if (address >= 0x8000 && address <= 0x9FFF)
{
int videoRamIndex = address - 0x8000;
videoRam [videoRamIndex] = (byte)value;
if (address < 0x9000)
{
spriteTileInvalidated [videoRamIndex >> 4] = true;
}
if (address < 0x9800)
{
invalidateAllBackgroundTilesRequest = true;
} else if (address >= 0x9C00)
{
int tileIndex = address - 0x9C00;
backgroundTileInvalidated [tileIndex >> 5, tileIndex & 0x1F] = true;
} else
{
int tileIndex = address - 0x9800;
backgroundTileInvalidated [tileIndex >> 5, tileIndex & 0x1F] = true;
}
} else if (address <= 0x7FFF || (address >= 0xA000 && address <= 0xBFFF))
{
cartridge.WriteByte(address, value);
} else if (address >= 0xE000 && address <= 0xFDFF)
{
workRam [address - 0xE000] = (byte)value;
} else
{
switch (address)
{
case 0xFF00: // key pad
keyP14 = (value & 0x10) != 0x10;
keyP15 = (value & 0x20) != 0x20;
break;
case 0xFF04: // Timer divider
break;
case 0xFF05: // Timer counter
timerCounter = value;
break;
case 0xFF06: // Timer modulo
timerModulo = value;
break;
case 0xFF07: // Time Control
timerRunning = (value & 0x04) == 0x04;
timerFrequency = (TimerFrequencyType)(0x03 & value);
break;
case 0xFF0F: // Interrupt Flag (an interrupt request)
keyPressedInterruptRequested = (value & 0x10) == 0x10;
serialIOTransferCompleteInterruptRequested = (value & 0x08) == 0x08;
timerOverflowInterruptRequested = (value & 0x04) == 0x04;
lcdcInterruptRequested = (value & 0x02) == 0x02;
vBlankInterruptRequested = (value & 0x01) == 0x01;
break;
case 0xFF10: // Sound channel 1, sweep
SoundChip.channel1.SetSweep(
(value & 0x70) >> 4,
(value & 0x07),
(value & 0x08) == 1);
soundRegisters [0x10 - 0x10] = value;
break;
case 0xFF11: // Sound channel 1, length and wave duty
SoundChip.channel1.SetDutyCycle((value & 0xC0) >> 6);
SoundChip.channel1.SetLength(value & 0x3F);
soundRegisters [0x11 - 0x10] = value;
break;
case 0xFF12: // Sound channel 1, volume envelope
SoundChip.channel1.SetEnvelope(
(value & 0xF0) >> 4,
(value & 0x07),
(value & 0x08) == 8);
soundRegisters [0x12 - 0x10] = value;
break;
case 0xFF13: // Sound channel 1, frequency low
soundRegisters [0x13 - 0x10] = value;
SoundChip.channel1.SetFrequency(
((soundRegisters [0x14 - 0x10] & 0x07) << 8) + soundRegisters [0x13 - 0x10]);
break;
case 0xFF14: // Sound channel 1, frequency high
soundRegisters [0x14 - 0x10] = value;
if ((soundRegisters [0x14 - 0x10] & 0x80) != 0)
{
SoundChip.channel1.SetLength(soundRegisters [0x11 - 0x10] & 0x3F);
SoundChip.channel1.SetEnvelope(
(soundRegisters [0x12 - 0x10] & 0xF0) >> 4,
(soundRegisters [0x12 - 0x10] & 0x07),
(soundRegisters [0x12 - 0x10] & 0x08) == 8);
}
if ((soundRegisters [0x14 - 0x10] & 0x40) == 0)
{
SoundChip.channel1.SetLength(-1);
}
SoundChip.channel1.SetFrequency(
((soundRegisters [0x14 - 0x10] & 0x07) << 8) + soundRegisters [0x13 - 0x10]);
break;
case 0xFF17: // Sound channel 2, volume envelope
SoundChip.channel2.SetEnvelope(
(value & 0xF0) >> 4,
value & 0x07,
(value & 0x08) == 8);
soundRegisters [0x17 - 0x10] = value;
break;
case 0xFF18: // Sound channel 2, frequency low
soundRegisters [0x18 - 0x10] = value;
SoundChip.channel2.SetFrequency(
((soundRegisters [0x19 - 0x10] & 0x07) << 8) + soundRegisters [0x18 - 0x10]);
break;
case 0xFF19: // Sound channel 2, frequency high
soundRegisters [0x19 - 0x10] = value;
if ((value & 0x80) != 0)
{
SoundChip.channel2.SetLength(soundRegisters [0x21 - 0x10] & 0x3F);
SoundChip.channel2.SetEnvelope(
(soundRegisters [0x17 - 0x10] & 0xF0) >> 4,
(soundRegisters [0x17 - 0x10] & 0x07),
(soundRegisters [0x17 - 0x10] & 0x08) == 8);
}
if ((soundRegisters [0x19 - 0x10] & 0x40) == 0)
{
SoundChip.channel2.SetLength(-1);
}
SoundChip.channel2.SetFrequency(
((soundRegisters [0x19 - 0x10] & 0x07) << 8) + soundRegisters [0x18 - 0x10]);
break;
case 0xFF16: // Sound channel 2, length and wave duty
SoundChip.channel2.SetDutyCycle((value & 0xC0) >> 6);
SoundChip.channel2.SetLength(value & 0x3F);
soundRegisters [0x16 - 0x10] = value;
break;
case 0xFF1A: // Sound channel 3, on/off
if ((value & 0x80) != 0)
{
SoundChip.channel3.SetVolume((soundRegisters [0x1C - 0x10] & 0x60) >> 5);
} else
{
SoundChip.channel3.SetVolume(0);
}
soundRegisters [0x1A - 0x10] = value;
break;
case 0xFF1B: // Sound channel 3, length
soundRegisters [0x1B - 0x10] = value;
SoundChip.channel3.SetLength(value);
break;
case 0xFF1C: // Sound channel 3, volume
soundRegisters [0x1C - 0x10] = value;
SoundChip.channel3.SetVolume((value & 0x60) >> 5);
break;
case 0xFF1D: // Sound channel 3, frequency lower 8-bit
soundRegisters [0x1D - 0x10] = value;
SoundChip.channel3.SetFrequency(
((soundRegisters [0x1E - 0x10] & 0x07) << 8) + soundRegisters [0x1D - 0x10]);
break;
case 0xFF1E: // Sound channel 3, frequency higher 3-bit
soundRegisters [0x1E - 0x10] = value;
if ((soundRegisters [0x19 - 0x10] & 0x80) != 0)
{
SoundChip.channel3.SetLength(soundRegisters [0x1B - 0x10]);
}
SoundChip.channel3.SetFrequency(
((soundRegisters [0x1E - 0x10] & 0x07) << 8) + soundRegisters [0x1D - 0x10]);
break;
case 0xFF20: // Sound channel 4, length
SoundChip.channel4.SetLength(value & 0x3F);
soundRegisters [0x20 - 0x10] = value;
break;
case 0xFF21: // Sound channel 4, volume envelope
SoundChip.channel4.SetEnvelope(
(value & 0xF0) >> 4,
(value & 0x07),
(value & 0x08) == 8);
soundRegisters [0x21 - 0x10] = value;
break;
case 0xFF22: // Sound channel 4, polynomial parameters
SoundChip.channel4.SetParameters(
(value & 0x07),
(value & 0x08) == 8,
(value & 0xF0) >> 4);
soundRegisters [0x22 - 0x10] = value;
break;
case 0xFF23: // Sound channel 4, initial/consecutive
soundRegisters [0x23 - 0x10] = value;
if ((value & 0x80) != 0)
{
SoundChip.channel4.SetLength(soundRegisters [0x20 - 0x10] & 0x3F);
} else if (((value & 0x80) & 0x40) == 0)
{
SoundChip.channel4.SetLength(-1);
}
break;
case 0xFF24:
// TODO volume
break;
case 0xFF25: // Stereo select
int chanData;
soundRegisters [0x25 - 0x10] = value;
chanData = 0;
if ((value & 0x01) != 0)
{
chanData |= SquareWaveGenerator.CHAN_LEFT;
}
if ((value & 0x10) != 0)
{
chanData |= SquareWaveGenerator.CHAN_RIGHT;
}
SoundChip.channel1.SetChannel(chanData);
chanData = 0;
if ((value & 0x02) != 0)
{
chanData |= SquareWaveGenerator.CHAN_LEFT;
}
if ((value & 0x20) != 0)
{
chanData |= SquareWaveGenerator.CHAN_RIGHT;
}
SoundChip.channel2.SetChannel(chanData);
chanData = 0;
if ((value & 0x04) != 0)
{
chanData |= VoluntaryWaveGenerator.CHAN_LEFT;
}
if ((value & 0x40) != 0)
{
chanData |= VoluntaryWaveGenerator.CHAN_RIGHT;
}
SoundChip.channel3.SetChannel(chanData);
chanData = 0;
if ((value & 0x08) != 0)
{
chanData |= NoiseGenerator.CHAN_LEFT;
}
if ((value & 0x80) != 0)
{
chanData |= NoiseGenerator.CHAN_RIGHT;
}
SoundChip.channel4.SetChannel(chanData);
break;
case 0xFF26:
SoundChip.soundEnabled = (value & 0x80) == 1;
break;
case 0xFF30:
case 0xFF31:
case 0xFF32:
case 0xFF33:
case 0xFF34:
case 0xFF35:
case 0xFF36:
case 0xFF37:
case 0xFF38:
case 0xFF39:
case 0xFF3A:
case 0xFF3B:
case 0xFF3C:
case 0xFF3D:
case 0xFF3E:
case 0xFF3F:
SoundChip.channel3.SetSamplePair(address - 0xFF30, value);
soundRegisters [address - 0xFF10] = value;
break;
case 0xFF40:
{ // LCDC control
bool _backgroundAndWindowTileDataSelect = backgroundAndWindowTileDataSelect;
bool _backgroundTileMapDisplaySelect = backgroundTileMapDisplaySelect;
bool _windowTileMapDisplaySelect = windowTileMapDisplaySelect;
lcdControlOperationEnabled = (value & 0x80) == 0x80;
windowTileMapDisplaySelect = (value & 0x40) == 0x40;
windowDisplayed = (value & 0x20) == 0x20;
backgroundAndWindowTileDataSelect = (value & 0x10) == 0x10;
backgroundTileMapDisplaySelect = (value & 0x08) == 0x08;
largeSprites = (value & 0x04) == 0x04;
spritesDisplayed = (value & 0x02) == 0x02;
backgroundDisplayed = (value & 0x01) == 0x01;
if (_backgroundAndWindowTileDataSelect != backgroundAndWindowTileDataSelect
|| _backgroundTileMapDisplaySelect != backgroundTileMapDisplaySelect
|| _windowTileMapDisplaySelect != windowTileMapDisplaySelect)
{
invalidateAllBackgroundTilesRequest = true;
}
break;
}
case 0xFF41: // LCDC Status
lcdcLycLyCoincidenceInterruptEnabled = (value & 0x40) == 0x40;
lcdcOamInterruptEnabled = (value & 0x20) == 0x20;
lcdcVBlankInterruptEnabled = (value & 0x10) == 0x10;
lcdcHBlankInterruptEnabled = (value & 0x08) == 0x08;
lcdcMode = (LcdcModeType)(value & 0x03);
break;
case 0xFF42: // Scroll Y;
scrollY = value;
break;
case 0xFF43: // Scroll X;
scrollX = value;
break;
case 0xFF44: // LY
ly = value;
break;
case 0xFF45: // LY Compare
lyCompare = value;
break;
case 0xFF46: // Memory Transfer
value <<= 8;
for (int i = 0; i < 0x8C; i++)
{
WriteByte(0xFE00 | i, ReadByte(value | i));
}
break;
case 0xFF47: // Background palette
Console.WriteLine("[0xFF47] = {0:X}", value);
for (int i = 0; i < 4; i++)
{
switch (value & 0x03)
{
case 0:
backgroundPalette [i] = WHITE;
break;
case 1:
backgroundPalette [i] = LIGHT_GRAY;
break;
case 2:
backgroundPalette [i] = DARK_GRAY;
break;
case 3:
backgroundPalette [i] = BLACK;
break;
}
value >>= 2;
}
invalidateAllBackgroundTilesRequest = true;
break;
case 0xFF48: // Object palette 0
for (int i = 0; i < 4; i++)
{
switch (value & 0x03)
{
case 0:
objectPalette0 [i] = WHITE;
break;
case 1:
objectPalette0 [i] = LIGHT_GRAY;
break;
case 2:
objectPalette0 [i] = DARK_GRAY;
break;
case 3:
objectPalette0 [i] = BLACK;
break;
}
value >>= 2;
}
invalidateAllSpriteTilesRequest = true;
break;
case 0xFF49: // Object palette 1
for (int i = 0; i < 4; i++)
{
switch (value & 0x03)
{
case 0:
objectPalette1 [i] = WHITE;
break;
case 1:
objectPalette1 [i] = LIGHT_GRAY;
break;
case 2:
objectPalette1 [i] = DARK_GRAY;
break;
case 3:
objectPalette1 [i] = BLACK;
break;
}
value >>= 2;
}
invalidateAllSpriteTilesRequest = true;
break;
case 0xFF4A: // Window Y
windowY = value;
break;
case 0xFF4B: // Window X
windowX = value;
break;
case 0xFFFF: // Interrupt Enable
keyPressedInterruptEnabled = (value & 0x10) == 0x10;
serialIOTransferCompleteInterruptEnabled = (value & 0x08) == 0x08;
timerOverflowInterruptEnabled = (value & 0x04) == 0x04;
lcdcInterruptEnabled = (value & 0x02) == 0x02;
vBlankInterruptEnabled = (value & 0x01) == 0x01;
break;
}
}
}
