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45 lines
1.1 KiB
C
45 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 Hp898f : public BaseMapper
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{
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private:
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uint8_t _regs[2];
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protected:
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uint16_t GetPRGPageSize() override { return 0x4000; }
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uint16_t GetCHRPageSize() override { return 0x2000; }
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uint16_t RegisterStartAddress() override { return 0x6000; }
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uint16_t RegisterEndAddress() override { return 0xFFFF; }
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void InitMapper() override
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{
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_regs[0] = _regs[1] = 0;
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UpdateState();
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}
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void StreamState(bool saving) override
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{
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BaseMapper::StreamState(saving);
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Stream(_regs[0], _regs[1]);
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}
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void UpdateState()
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{
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uint8_t prgReg = (_regs[1] >> 3) & 7;
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uint8_t prgMask = (_regs[1] >> 4) & 4;
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SelectCHRPage(0, (((_regs[0] >> 4) & 0x07) & ~(((_regs[0] & 0x01) << 2) | (_regs[0] & 0x02))));
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SelectPRGPage(0, prgReg & (~prgMask));
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SelectPRGPage(1, prgReg | prgMask);
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SetMirroringType(_regs[1] & 0x80 ? MirroringType::Vertical : MirroringType::Horizontal);
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}
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void WriteRegister(uint16_t addr, uint8_t value) override
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{
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if((addr & 0x6000) == 0x6000) {
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_regs[(addr & 0x04) >> 2] = value;
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UpdateState();
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}
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}
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};
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