public void InitializeEngine()
{
myCartridge = new NesCartridge();
my6502 = new ProcessorNes6502(this);
myMapper = new Mapper(this, myCartridge);
myPpu = new Ppu(this);
myJoypad = new Joypad();
scratchRam = new byte[4][];
scratchRam[0] = new byte[0x800];
scratchRam[1] = new byte[0x800];
scratchRam[2] = new byte[0x800];
scratchRam[3] = new byte[0x800];
saveRam = new byte[0x2000];
isSaveRamReadOnly = false;
isDebugging = false;
isQuitting = false;
isPaused = false;
hasQuit = false;
fixBackgroundChange = false;
fixSpriteHit = false;
fixScrollOffset1 = false;
fixScrollOffset2 = false;
fixScrollOffset3 = false;
}
public byte WriteMemory8(ushort address, byte data)
{
if (address < 0x800)
{
scratchRam[0][address] = data;
}
else if (address < 0x1000)
{
scratchRam[1][address - 0x800] = data;
}
else if (address < 0x1800)
{
scratchRam[2][address - 0x1000] = data;
}
else if (address < 0x2000)
{
scratchRam[3][address - 0x1800] = data;
}
else if (address < 0x4000)
{
//address = (ushort)((address - 0x2000) % 8);
switch (address)
{
case (0x2000): myPpu.ControlRegister1Write(data); break;
case (0x2001): myPpu.ControlRegister2Write(data); break;
case (0x2003): myPpu.SpriteRamAddressRegisterWrite(data); break;
case (0x2004): myPpu.SpriteRamIORegisterWrite(data); break;
case (0x2005): myPpu.VramAddressRegister1Write(data); break;
case (0x2006): myPpu.VramAddressRegister2Write(data); break;
case (0x2007): myPpu.VramIORegisterWrite(data); break;
//default: Console.WriteLine("UNKOWN CONTROL WRITE: {0}", address); break;
}
}
else if (address < 0x6000)
{
switch (address)
{
case (0x4014): myPpu.SpriteRamDmaBegin(data); break;
case (0x4016): myJoypad.Joypad1Write(data); break;
case (0x4017): Joypad.Joypad2Write(/*data)*/); break;
//default: Console.WriteLine("UNKOWN WRITE: {0:x}", address); break;
}
if (myCartridge.Mapper == 5)
{
myMapper.WritePrgRom(address, data);
}
}
else if (address < 0x8000)
{
if (!isSaveRamReadOnly)
{
saveRam[address - 0x6000] = data;
}
if (myCartridge.Mapper == 34)
{
myMapper.WritePrgRom(address, data);
}
}
else
{
myMapper.WritePrgRom(address, data);
}
return(1);
}
public byte ReadMemory8(ushort address)
{
byte returnvalue = 0;
if (address < 0x2000)
{
if (address < 0x800)
{
returnvalue = scratchRam[0][address];
}
else if (address < 0x1000)
{
returnvalue = scratchRam[1][address - 0x800];
//Console.WriteLine("I need ram Mirroring {0:x}", address);
}
else if (address < 0x1800)
{
returnvalue = scratchRam[2][address - 0x1000];
//Console.WriteLine("I need ram Mirroring {0:x}", address);
}
//else if (address < 0x2000) {
else
{
returnvalue = scratchRam[3][address - 0x1800];
//Console.WriteLine("I need ram Mirroring {0:x}", address);
}
//returnvalue = scratchRam[address >> 11][address & 0x7ff];
}
else if (address < 0x6000)
{
switch (address)
{
case (0x2002): returnvalue = myPpu.StatusRegisterRead(); break;
case (0x2004): returnvalue = myPpu.SpriteRamIORegisterRead(); break;
case (0x2007): returnvalue = myPpu.VramIORegisterRead(); break;
//case (0x4015): returnvalue = myPPU.Sound_Signal_Register_Read(); break;
case (0x4016): returnvalue = myJoypad.Joypad1Read(); break;
case (0x4017): returnvalue = Joypad.Joypad2Read(); break;
//default: Console.WriteLine("UNKOWN READ: {0:x}", address); break;
}
}
else if (address < 0x8000)
{
returnvalue = saveRam[address - 0x6000];
if (myCartridge.Mapper == 5)
{
returnvalue = 1;
}
}
else
{
returnvalue = myMapper.ReadPrgRom(address);
}
return(returnvalue);
}
