#pragma once #include "stdafx.h" #include "MMC3.h" class MMC3_254 : public MMC3 { private: uint8_t _exRegs[2]; protected: virtual bool AllowRegisterRead() override { return true; } virtual void InitMapper() override { MMC3::InitMapper(); AddRegisterRange(0x6000, 0x7FFF, MemoryOperation::Read); RemoveRegisterRange(0x8000, 0xFFFF, MemoryOperation::Read); } virtual void StreamState(bool saving) override { MMC3::StreamState(saving); Stream(_exRegs[0], _exRegs[1]); } uint8_t ReadRegister(uint16_t addr) override { uint8_t value = InternalReadRam(addr); if(_exRegs[0]) { return value; } else { return value ^ _exRegs[1]; } } void WriteRegister(uint16_t addr, uint8_t value) override { switch(addr) { case 0x8000: _exRegs[0] = 0xFF; break; case 0xA001: _exRegs[1] = value; break; } MMC3::WriteRegister(addr, value); } };