AxibugEmuOnline/AxibugEmuOnline.Client/Assets/Runtime/Mapper/DxROM.cs
2024-06-28 18:08:25 +08:00

40 lines
1.2 KiB
C#

namespace AxibugEmuOnline.Client.UNES.Mapper
{
[MapperDef(206)]
public class DxROM : MMC3
{
public DxROM(Emulator emulator) : base(emulator)
{
_prgBankingMode = PRGBankingMode.SwitchFix;
_chrBankingMode = CHRBankingMode.TwoFour;
}
public override void InitializeMemoryMap(CPU cpu)
{
cpu.MapReadHandler(0x8000, 0xFFFF, address => _prgROM[_prgBankOffsets[(address - 0x8000) / 0x2000] + address % 0x2000]);
cpu.MapWriteHandler(0x8000, 0x9FFF, (address, val) =>
{
if ((address & 0x1) == 0)
{
_currentBank = val & 0x7u;
}
else
{
if (_currentBank <= 1) val &= 0x1F;
else if (_currentBank <= 5) val &= 0x3F;
else val &= 0xF;
_banks[_currentBank] = val;
UpdateOffsets();
}
});
}
public override void InitializeMemoryMap(PPU ppu)
{
ppu.MapReadHandler(0x0000, 0x1FFF, address => _chrROM[_chrBankOffsets[address / 0x400] + address % 0x400]);
}
}
}