mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
95 lines
No EOL
2.3 KiB
C++
95 lines
No EOL
2.3 KiB
C++
#pragma once
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#include "pch.h"
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#include "NES/Mappers/Nintendo/MMC3.h"
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class MMC3_187: public MMC3
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{
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private:
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uint8_t _exRegs[2] = {};
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protected:
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bool AllowRegisterRead() override { return true; }
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void InitMapper() override
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{
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MMC3::InitMapper();
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memset(_exRegs, 0, sizeof(_exRegs));
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AddRegisterRange(0x5000, 0x5FFF, MemoryOperation::Any);
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AddRegisterRange(0x6000, 0x6FFF, MemoryOperation::Write);
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RemoveRegisterRange(0x8000, 0xFFFF, MemoryOperation::Read);
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}
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void SelectChrPage(uint16_t slot, uint16_t page, ChrMemoryType memoryType = ChrMemoryType::Default) override
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{
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if((_chrMode && slot >= 4) || (!_chrMode && slot < 4)) {
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page |= 0x100;
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}
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BaseMapper::SelectChrPage(slot, page);
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}
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void SelectPrgPage(uint16_t slot, uint16_t page, PrgMemoryType memoryType = PrgMemoryType::PrgRom) override
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{
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if(!(_exRegs[0] & 0x80)) {
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BaseMapper::SelectPrgPage(slot, page & 0x3F, memoryType);
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} else {
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uint16_t exPage = _exRegs[0] & 0x1F;
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if(_exRegs[0] & 0x20) {
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if(_exRegs[0] & 0x40) {
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exPage &= 0xFC;
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BaseMapper::SelectPrgPage(0, exPage);
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BaseMapper::SelectPrgPage(1, exPage +1);
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BaseMapper::SelectPrgPage(2, exPage +2);
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BaseMapper::SelectPrgPage(3, exPage +3);
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} else {
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exPage &= 0xFE;
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BaseMapper::SelectPrgPage(0, (exPage << 1));
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BaseMapper::SelectPrgPage(1, (exPage << 1) + 1);
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BaseMapper::SelectPrgPage(2, (exPage << 1) + 2);
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BaseMapper::SelectPrgPage(3, (exPage << 1) + 3);
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}
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} else {
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BaseMapper::SelectPrgPage(0, (exPage << 1));
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BaseMapper::SelectPrgPage(1, (exPage << 1) + 1);
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BaseMapper::SelectPrgPage(2, (exPage << 1));
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BaseMapper::SelectPrgPage(3, (exPage << 1) + 1);
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}
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}
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}
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uint8_t ReadRegister(uint16_t addr) override
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{
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uint8_t security[4] = { 0x83,0x83,0x42,0x00 };
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return security[_exRegs[1] & 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 < 0x8000) {
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if(addr == 0x5000 || addr == 0x6000) {
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_exRegs[0] = value;
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MMC3::UpdatePrgMapping();
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}
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} else {
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if(addr == 0x8000) {
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_exRegs[1] = 1;
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MMC3::WriteRegister(addr, value);
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} else if(addr == 0x8001) {
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if(_exRegs[1] == 1) {
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MMC3::WriteRegister(addr, value);
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}
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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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void Serialize(Serializer& s) override
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{
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MMC3::Serialize(s);
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SV(_exRegs[0]);
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SV(_exRegs[1]);
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}
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}; |