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50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Mapper15 : public BaseMapper
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{
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protected:
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virtual uint16_t GetPRGPageSize() { return 0x2000; }
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virtual uint16_t GetCHRPageSize() { return 0x2000; }
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void InitMapper()
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{
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WriteRegister(0x8000, 0);
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SelectCHRPage(0, 0);
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}
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void WriteRegister(uint16_t addr, uint8_t value)
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{
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SetMirroringType(value & 0x40 ? MirroringType::Horizontal : MirroringType::Vertical);
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uint8_t subBank = value >> 7;
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uint8_t bank = (value & 0x7F) << 1;
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switch(addr & 0x03) {
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case 0:
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SelectPRGPage(0, bank ^ subBank);
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SelectPRGPage(1, (bank + 1) ^ subBank);
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SelectPRGPage(2, (bank + 2) ^ subBank);
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SelectPRGPage(3, (bank + 3) ^ subBank);
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break;
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case 1:
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case 3:
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bank |= subBank;
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SelectPRGPage(0, bank);
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SelectPRGPage(1, bank + 1);
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SelectPRGPage(2, bank + ((addr & 0x02) ? 0 : 1));
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SelectPRGPage(3, bank + 1);
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break;
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case 2:
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bank |= subBank;
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SelectPRGPage(0, bank);
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SelectPRGPage(1, bank);
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SelectPRGPage(2, bank);
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SelectPRGPage(3, bank);
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break;
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}
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}
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};
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