44 lines
899 B
C
44 lines
899 B
C
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#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Mapper244 : public BaseMapper
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{
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private:
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uint8_t _lutPrg[4][4] = {
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{ 0, 1, 2, 3 },
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{ 3, 2, 1, 0 },
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{ 0, 2, 1, 3 },
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{ 3, 1, 2, 0 }
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};
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uint8_t _lutChr[8][8] = {
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{ 0, 1, 2, 3, 4, 5, 6, 7 },
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{ 0, 2, 1, 3, 4, 6, 5, 7 },
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{ 0, 1, 4, 5, 2, 3, 6, 7 },
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{ 0, 4, 1, 5, 2, 6, 3, 7 },
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{ 0, 4, 2, 6, 1, 5, 3, 7 },
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{ 0, 2, 4, 6, 1, 3, 5, 7 },
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{ 7, 6, 5, 4, 3, 2, 1, 0 },
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{ 7, 6, 5, 4, 3, 2, 1, 0 }
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};
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protected:
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virtual uint16_t GetPRGPageSize() { return 0x8000; }
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virtual uint16_t GetCHRPageSize() { return 0x2000; }
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void InitMapper()
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{
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SelectPRGPage(0, 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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if(value & 0x08) {
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SelectCHRPage(0, _lutChr[(value >> 4) & 0x07][value & 0x07]);
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} else {
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SelectPRGPage(0, _lutPrg[(value >> 4) & 0x03][value & 0x03]);
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}
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}
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};
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