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https://github.com/SourMesen/Mesen2.git
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56 lines
1 KiB
C++
56 lines
1 KiB
C++
#pragma once
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#include "pch.h"
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#include "NES/BaseMapper.h"
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class Bmc830425C4391T : public BaseMapper
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{
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private:
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uint8_t _innerReg = 0;
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uint8_t _outerReg = 0;
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uint8_t _prgMode = 0;
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protected:
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uint16_t GetPrgPageSize() override { return 0x4000; }
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uint16_t GetChrPageSize() override { return 0x2000; }
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void InitMapper() override
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{
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_innerReg = 0;
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_outerReg = 0;
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_prgMode = 0;
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SelectChrPage(0, 0);
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UpdateState();
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}
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void Serialize(Serializer& s) override
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{
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BaseMapper::Serialize(s);
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SV(_innerReg);
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SV(_outerReg);
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SV(_prgMode);
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}
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void UpdateState()
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{
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if(_prgMode) {
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//UNROM mode
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SelectPrgPage(0, (_innerReg & 0x07) | (_outerReg << 3));
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SelectPrgPage(1, 0x07 | (_outerReg << 3));
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} else {
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//UOROM mode
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SelectPrgPage(0, _innerReg | (_outerReg << 3));
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SelectPrgPage(1, 0x0F | (_outerReg << 3));
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}
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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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_innerReg = value & 0x0F;
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if((addr & 0xFFE0) == 0xF0E0) {
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_outerReg = addr & 0x0F;
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_prgMode = (addr >> 4) & 0x01;
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}
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UpdateState();
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}
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};
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