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34 lines
796 B
C++
34 lines
796 B
C++
#pragma once
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#include "pch.h"
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#include "NES/BaseMapper.h"
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class Mapper225 : public BaseMapper
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{
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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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SelectPrgPage(0, 0);
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SelectPrgPage(1, 1);
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SelectChrPage(0, 0);
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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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uint8_t highBit = (addr >> 8) & 0x40;
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uint8_t prgPage = ((addr >> 6) & 0x3F) | highBit;
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if(addr & 0x1000) {
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SelectPrgPage(0, prgPage);
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SelectPrgPage(1, prgPage);
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} else {
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SelectPrgPage(0, prgPage & 0xFE);
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SelectPrgPage(1, (prgPage & 0xFE) + 1);
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}
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SelectChrPage(0, (addr & 0x3F) | highBit);
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SetMirroringType(addr & 0x2000 ? MirroringType::Horizontal : MirroringType::Vertical);
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}
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};
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