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26 lines
686 B
C++
26 lines
686 B
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Bmc255 : public BaseMapper
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{
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protected:
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virtual uint16_t GetPRGPageSize() override { return 0x4000; }
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virtual uint16_t GetCHRPageSize() override { return 0x2000; }
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void InitMapper() override
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{
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WriteRegister(0x8000, 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 prgBit = (addr & 0x1000) ? 0 : 1;
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uint8_t bank = ((addr >> 8) & 0x40) | ((addr >> 6) & 0x3F);
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SelectPRGPage(0, bank & ~prgBit);
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SelectPRGPage(1, bank | prgBit);
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SelectCHRPage(0, ((addr >> 8) & 0x40) | (addr & 0x3F));
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SetMirroringType(addr & 0x2000 ? MirroringType::Horizontal : MirroringType::Vertical);
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}
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}; |