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https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
55 lines
No EOL
1.3 KiB
C++
55 lines
No EOL
1.3 KiB
C++
#pragma once
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#include "pch.h"
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#include "NES/BaseMapper.h"
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class Subor166 : public BaseMapper
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{
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private:
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uint8_t _regs[4] = {};
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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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void InitMapper() override
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{
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memset(_regs, 0, sizeof(_regs));
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WriteRegister(0x8000, 0);
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SelectChrPage(0, 0);
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}
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void Serialize(Serializer& s) override
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{
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BaseMapper::Serialize(s);
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SVArray(_regs, 4);
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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 & 0xE000) {
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case 0x8000: _regs[0] = value & 0x10; break;
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case 0xA000: _regs[1] = value & 0x1C; break;
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case 0xC000: _regs[2] = value & 0x1F; break;
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case 0xE000: _regs[3] = value & 0x1F; break;
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}
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uint8_t outerBank = ((_regs[0] ^ _regs[1]) & 0x10) << 1;
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uint8_t innerBank = _regs[2] ^ _regs[3];
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bool altMode = _romInfo.MapperID == 167;
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if(_regs[1] & 0x08) {
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//32 KiB NROM
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uint8_t bank = (outerBank | innerBank) & 0xFE;
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SelectPrgPage(0, altMode ? bank + 1 : bank);
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SelectPrgPage(1, altMode ? bank : bank + 1);
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} else if(_regs[1] & 0x04) {
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//512 KiB inverted UNROM(mapper 180)
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SelectPrgPage(0, 0x1F);
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SelectPrgPage(1, outerBank | innerBank);
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} else {
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//512 KiB UNROM
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SelectPrgPage(0, outerBank | innerBank);
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SelectPrgPage(1, altMode ? 0x20 : 0x07);
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}
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}
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}; |