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https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
68 lines
No EOL
1.4 KiB
C++
68 lines
No EOL
1.4 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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#include "NES/NesConsole.h"
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#include "NES/NesMemoryManager.h"
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class Unl158B : public MMC3
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{
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private:
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static constexpr uint8_t _protectionLut[8] = { 0x00, 0x00, 0x00, 0x01, 0x02, 0x04, 0x0F, 0x00 };
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uint8_t _reg = 0;
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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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_reg = 0;
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AddRegisterRange(0x5000, 0x5FFF, MemoryOperation::Any);
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RemoveRegisterRange(0x8000, 0xFFFF, MemoryOperation::Read);
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MMC3::InitMapper();
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}
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void Reset(bool softReset) override
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{
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_reg = 0;
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ResetMmc3();
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MMC3::Reset(softReset);
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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(_reg);
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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(_reg & 0x80) {
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uint32_t bank = _reg & 0x07;
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if(_reg & 0x20) {
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SelectPrgPage4x(0, (bank & 0x06) << 1);
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} else {
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SelectPrgPage2x(0, bank << 1);
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SelectPrgPage2x(1, bank << 1);
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}
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} else {
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MMC3::SelectPrgPage(slot, page & 0x0F);
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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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return _console->GetMemoryManager()->GetOpenBus() | _protectionLut[addr & 0x07];
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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 <= 0x5FFF) {
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if((addr & 0x07) == 0) {
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_reg = value;
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UpdatePrgMapping();
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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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}; |