46 lines
925 B
C
46 lines
925 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 BF9096 : public BaseMapper
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{
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private:
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uint8_t _prgBlock;
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uint8_t _prgPage;
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protected:
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virtual uint16_t GetPRGPageSize() { return 0x4000; }
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virtual uint16_t GetCHRPageSize() { return 0x2000; }
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void InitMapper()
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{
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_prgPage = 0;
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_prgBlock = 0;
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SelectPRGPage(0, 0);
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SelectPRGPage(1, 3);
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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(addr >= 0xC000) {
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_prgPage = value & 0x03;
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} else if(addr < 0xC000) {
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//Some cartridges appear to expect the bits for the block selection to be inverted.
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//Different wiring on board?
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_prgBlock = (value >> 3) & 0x03;
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}
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SelectPRGPage(0, (_prgBlock << 2) | _prgPage);
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SelectPRGPage(1, (_prgBlock << 2) | 3);
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}
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virtual void StreamState(bool saving)
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{
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BaseMapper::StreamState(saving);
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Stream<uint8_t>(_prgBlock);
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Stream<uint8_t>(_prgPage);
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}
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};
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