public override void StateLoad(BinaryReader reader)
{
prgBanks[0] = reader.ReadByte();
prgBanks[1] = reader.ReadByte();
prgBanks[2] = reader.ReadByte();
chrBanks[0] = reader.ReadByte();
chrBanks[1] = reader.ReadByte();
chrBanks[2] = reader.ReadByte();
chrBanks[3] = reader.ReadByte();
chrBanks[4] = reader.ReadByte();
chrBanks[5] = reader.ReadByte();
chrBanks[6] = reader.ReadByte();
chrBanks[7] = reader.ReadByte();
irqReload = reader.ReadInt32();
irqCounter = reader.ReadInt32();
irqEnable = reader.ReadBoolean();
irqWidth = (CounterWidth)reader.ReadInt32();
}
public override void Write(byte value, ushort address)
{
if (address >= 0x8000)
{
switch (address & 0xF003)
{
case 0x8000:
prgBanks[0] = (byte)((prgBanks[0] & 0xF0) | ((value & 0x0F) << 0));
PrgSync();
break;
case 0x8001:
prgBanks[0] = (byte)((prgBanks[0] & 0x0F) | ((value & 0x0F) << 4));
PrgSync();
break;
case 0x8002:
prgBanks[1] = (byte)((prgBanks[1] & 0xF0) | ((value & 0x0F) << 0));
PrgSync();
break;
case 0x8003:
prgBanks[1] = (byte)((prgBanks[1] & 0x0F) | ((value & 0x0F) << 4));
PrgSync();
break;
case 0x9000:
prgBanks[2] = (byte)((prgBanks[2] & 0xF0) | ((value & 0x0F) << 0));
PrgSync();
break;
case 0x9001:
prgBanks[2] = (byte)((prgBanks[2] & 0x0F) | ((value & 0x0F) << 4));
PrgSync();
break;
case 0xA000:
chrBanks[0] = (byte)((chrBanks[0] & 0xF0) | ((value & 0x0F) << 0));
ChrSync();
break;
case 0xA001:
chrBanks[0] = (byte)((chrBanks[0] & 0x0F) | ((value & 0x0F) << 4));
ChrSync();
break;
case 0xA002:
chrBanks[1] = (byte)((chrBanks[1] & 0xF0) | ((value & 0x0F) << 0));
ChrSync();
break;
case 0xA003:
chrBanks[1] = (byte)((chrBanks[1] & 0x0F) | ((value & 0x0F) << 4));
ChrSync();
break;
case 0xB000:
chrBanks[2] = (byte)((chrBanks[2] & 0xF0) | ((value & 0x0F) << 0));
ChrSync();
break;
case 0xB001:
chrBanks[2] = (byte)((chrBanks[2] & 0x0F) | ((value & 0x0F) << 4));
ChrSync();
break;
case 0xB002:
chrBanks[3] = (byte)((chrBanks[3] & 0xF0) | ((value & 0x0F) << 0));
ChrSync();
break;
case 0xB003:
chrBanks[3] = (byte)((chrBanks[3] & 0x0F) | ((value & 0x0F) << 4));
ChrSync();
break;
case 0xC000:
chrBanks[4] = (byte)((chrBanks[4] & 0xF0) | ((value & 0x0F) << 0));
ChrSync();
break;
case 0xC001:
chrBanks[4] = (byte)((chrBanks[4] & 0x0F) | ((value & 0x0F) << 4));
ChrSync();
break;
case 0xC002:
chrBanks[5] = (byte)((chrBanks[5] & 0xF0) | ((value & 0x0F) << 0));
ChrSync();
break;
case 0xC003:
chrBanks[5] = (byte)((chrBanks[5] & 0x0F) | ((value & 0x0F) << 4));
ChrSync();
break;
case 0xD000:
chrBanks[6] = (byte)((chrBanks[6] & 0xF0) | ((value & 0x0F) << 0));
ChrSync();
break;
case 0xD001:
chrBanks[6] = (byte)((chrBanks[6] & 0x0F) | ((value & 0x0F) << 4));
ChrSync();
break;
case 0xD002:
chrBanks[7] = (byte)((chrBanks[7] & 0xF0) | ((value & 0x0F) << 0));
ChrSync();
break;
case 0xD003:
chrBanks[7] = (byte)((chrBanks[7] & 0x0F) | ((value & 0x0F) << 4));
ChrSync();
break;
case 0xE000:
irqReload = (irqReload & 0xFFF0) | (value & 0x0F);
break;
case 0xE001:
irqReload = (irqReload & 0xFF0F) | ((value & 0x0F) << 4);
break;
case 0xE002:
irqReload = (irqReload & 0xF0FF) | ((value & 0x0F) << 8);
break;
case 0xE003:
irqReload = (irqReload & 0x0FFF) | ((value & 0x0F) << 12);
break;
case 0xF000:
irqCounter = irqReload;
interruptMapper = false;
break;
case 0xF001:
irqEnable = (value & 1) == 1;
interruptMapper = false;
switch ((value >> 1) & 7)
{
case 0:
irqWidth = CounterWidth.SixteenBit;
break;
case 1:
irqWidth = CounterWidth.TweleveBit;
break;
case 2:
case 3:
irqWidth = CounterWidth.EightBit;
break;
default:
irqWidth = CounterWidth.FourBit;
break;
}
break;
case 0xF002:
switch (value & 3)
{
case 0:
nes.PPU.PPUMemory.HorizontalMirroring();
break;
case 1:
nes.PPU.PPUMemory.VerticalMirroring();
break;
case 2:
nes.PPU.PPUMemory.ScreenOneMirroring();
break;
case 3:
nes.PPU.PPUMemory.ScreenTwoMirroring();
break;
}
break;
}
}
}
