50 lines
1 KiB
C
50 lines
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 Mapper170 : public BaseMapper
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{
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private:
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uint8_t _reg;
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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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virtual uint16_t RegisterStartAddress() { return 0x7000; }
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virtual uint16_t RegisterEndAddress() { return 0x7001; }
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virtual bool AllowRegisterRead() { return true; }
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void InitMapper()
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{
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_reg = 0;
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RemoveRegisterRange(0x7000, 0x7000, MemoryOperation::Read);
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RemoveRegisterRange(0x7001, 0x7001, MemoryOperation::Write);
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AddRegisterRange(0x6502, 0x6502, MemoryOperation::Write);
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AddRegisterRange(0x7777, 0x7777, MemoryOperation::Read);
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SelectPRGPage(0, 0);
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SelectCHRPage(0, 0);
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}
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void Reset(bool softReset)
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{
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_reg = 0;
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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(_reg);
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}
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void WriteRegister(uint16_t addr, uint8_t value)
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{
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_reg = (value << 1) & 0x80;
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}
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uint8_t ReadRegister(uint16_t addr)
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{
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return _reg | ((addr >> 8) & 0x7F);
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}
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};
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