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https://github.com/libretro/Mesen.git
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77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
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#pragma once
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#include "stdafx.h"
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#include "MMC3.h"
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class MMC3_208 : public MMC3
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{
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private:
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const uint8_t _protectionLut[256] = {
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x49, 0x19, 0x09, 0x59, 0x49, 0x19, 0x09,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x51, 0x41, 0x11, 0x01, 0x51, 0x41, 0x11, 0x01,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x49, 0x19, 0x09, 0x59, 0x49, 0x19, 0x09,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x51, 0x41, 0x11, 0x01, 0x51, 0x41, 0x11, 0x01,
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0x00, 0x10, 0x40, 0x50, 0x00, 0x10, 0x40, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x08, 0x18, 0x48, 0x58, 0x08, 0x18, 0x48, 0x58, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x10, 0x40, 0x50, 0x00, 0x10, 0x40, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x08, 0x18, 0x48, 0x58, 0x08, 0x18, 0x48, 0x58, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x58, 0x48, 0x18, 0x08, 0x58, 0x48, 0x18, 0x08,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x50, 0x40, 0x10, 0x00, 0x50, 0x40, 0x10, 0x00,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x58, 0x48, 0x18, 0x08, 0x58, 0x48, 0x18, 0x08,
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0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x50, 0x40, 0x10, 0x00, 0x50, 0x40, 0x10, 0x00,
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0x01, 0x11, 0x41, 0x51, 0x01, 0x11, 0x41, 0x51, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x09, 0x19, 0x49, 0x59, 0x09, 0x19, 0x49, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x01, 0x11, 0x41, 0x51, 0x01, 0x11, 0x41, 0x51, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x09, 0x19, 0x49, 0x59, 0x09, 0x19, 0x49, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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};
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uint8_t _exRegs[6];
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protected:
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uint16_t RegisterStartAddress() override { return 0x8000; }
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uint16_t RegisterEndAddress() override { return 0xFFFF; }
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bool AllowRegisterRead() override { return true; }
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void InitMapper() override
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{
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_exRegs[5] = 3;
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MMC3::InitMapper();
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AddRegisterRange(0x4800, 0x4FFF, MemoryOperation::Write);
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AddRegisterRange(0x6800, 0x6FFF, MemoryOperation::Write);
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AddRegisterRange(0x5000, 0x5FFF, MemoryOperation::Write);
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AddRegisterRange(0x5800, 0x5FFF, MemoryOperation::Read);
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RemoveRegisterRange(0x8000, 0xFFFF, MemoryOperation::Read);
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}
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void StreamState(bool saving) override
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{
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MMC3::StreamState(saving);
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ArrayInfo<uint8_t> exRegs { _exRegs, 6 };
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Stream(exRegs);
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}
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void UpdatePrgMapping()
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{
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SelectPrgPage4x(0, _exRegs[5] << 2);
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}
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uint8_t ReadRegister(uint16_t addr)
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{
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return _exRegs[addr & 0x03];
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}
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void WriteRegister(uint16_t addr, uint8_t value) override
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{
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if(addr >= 0x5000 && addr <= 0x5FFF) {
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if(addr <= 0x57FF) {
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_exRegs[4] = value;
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} else {
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_exRegs[addr & 0x03] = value ^ _protectionLut[_exRegs[4]];
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}
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} else if(addr < 0x8000) {
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_exRegs[5] = (value & 0x01) | ((value >> 3) & 0x02);
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UpdatePrgMapping();
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} else {
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MMC3::WriteRegister(addr, value);
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}
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}
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};
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