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57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Sachen74LS374N : public BaseMapper
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{
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private:
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uint8_t _currentRegister;
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uint8_t _regs[8];
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protected:
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uint16_t RegisterStartAddress() override { return 0x4100; }
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uint16_t RegisterEndAddress() override { return 0x7FFF; }
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uint16_t GetPRGPageSize() override { return 0x8000; }
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uint16_t GetCHRPageSize() override { return 0x2000; }
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void InitMapper() override
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{
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_currentRegister = 0;
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memset(_regs, 0, sizeof(_regs));
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SelectPRGPage(0, 0);
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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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ArrayInfo<uint8_t> regs{ _regs, 8 };
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Stream(_currentRegister, regs);
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}
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virtual void UpdateState()
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{
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uint8_t chrPage = ((_regs[2] & 0x01) << 3) | ((_regs[6] & 0x03) << 1) | (_regs[4] & 0x01);
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SelectCHRPage(0, chrPage);
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SelectPRGPage(0, _regs[5] & 0x01);
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SetMirroringType(_regs[7] & 0x01 ? 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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switch(addr & 0xC101) {
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case 0x4100: _currentRegister = value & 0x07; break;
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case 0x4101:
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_regs[_currentRegister] = value;
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if(_currentRegister == 0) {
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SelectCHRPage(0, 3);
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SelectPRGPage(0, 0);
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} else {
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UpdateState();
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}
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break;
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}
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}
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};
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