private void WriteMBC1(int address, byte value)
{
if (address >= 0x0000 && address <= 0x1FFF)
{
_enableRamWrite = ((value & 0x0F) == 0x0A);
}
else if (address >= 0x2000 && address <= 0x3FFF)
{
SwitchRomBank(value, 0x1F);
}
else if (address >= 0x4000 && address <= 0x5FFF)
{
if (_mbc1Type == MBC1Type._4_32 && _enableRamWrite)
{
SwitchRamBank(value, 0x03);
}
else if (_mbc1Type == MBC1Type._16_8)
{
// Quand on écrit dans la plage 0x4000 - 0x5FFF (qui est normalement une plage Readonly), on indique à la gameboy qu'on veut changer de bank
// La bank choisit correspond à la bank voulue et les bit 5 et 6 correspondent aux bits 0 et 1 de la valeur qu'on a voulu écrire.
// Exemple : ROMNumber = 29, valeur écrite dans la plage 0x4000-0x5FFF = 2
// ROMNumber = 0001 1101, valeur = 0000 0010 => Nouveau ROMNumber = 0001 1101 & (10 << 5) = 0101 1101 = 93
byte newValue = (byte)(((value & 0x03) << 5) & ROMNumber);
SwitchRomBank(newValue, 0xFF);
}
}
else if (address >= 0x6000 && address <= 0x7FFF)
{
_mbc1Type = (MBC1Type)(value & 0x01);
}
else
{
_data[address] = value;
}
}
public Memory(MBCType mbc, Processor owner)
{
_mbc1Type = MBC1Type._16_8;
_mbc = mbc;
_data = new byte[0x10000];
ROMNumber = 0;
RAMNumber = 0;
Array.Copy(SharpEmulator._data, _data, 0x8000);
RAMData = new byte[SharpEmulator.GetRAMCountFromData() * 1024];
for (int i = 0; i < RAMData.Length; i++)
{
RAMData[i] = 0xFF;
}
if (RAMData.Length > 0)
{
Array.Copy(RAMData, 0x0000, _data, 0xA000, 0x2000);
}
LoadSavedGame(ROM.SavePath);
InitMemory();
_owner = owner;
}
