63 lines
1.1 KiB
C
63 lines
1.1 KiB
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 Mapper221 : public BaseMapper
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{
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private:
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uint16_t _mode;
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uint8_t _prgReg;
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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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_prgReg = 0;
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_mode = 0;
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SelectCHRPage(0, 0);
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UpdateState();
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}
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void StreamState(bool saving)
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{
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BaseMapper::StreamState(saving);
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Stream(_mode, _prgReg);
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}
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void UpdateState()
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{
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uint16_t outerBank = (_mode & 0xFC) >> 2;
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if(_mode & 0x02) {
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if(_mode & 0x0100) {
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SelectPRGPage(0, outerBank | _prgReg);
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SelectPRGPage(1, outerBank | 0x07);
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} else {
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SelectPrgPage2x(0, outerBank | (_prgReg & 0x06));
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}
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} else {
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SelectPRGPage(0, outerBank | _prgReg);
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SelectPRGPage(1, outerBank | _prgReg);
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}
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SetMirroringType(_mode & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical);
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}
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void WriteRegister(uint16_t addr, uint8_t value)
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{
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switch(addr & 0xC000) {
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case 0x8000:
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_mode = addr;
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UpdateState();
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break;
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case 0xC000:
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_prgReg = addr & 0x07;
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UpdateState();
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break;
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}
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}
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};
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