45f2a51f28
Courtesy to @ptkila for the fix, confirmed working as intended after merge in my own branch.
66 lines
1.5 KiB
C++
66 lines
1.5 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "MMC3.h"
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class MMC3_52 : public MMC3
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{
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private:
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uint8_t _extraReg = 0;
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protected:
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virtual uint16_t RegisterStartAddress() override { return 0x6000; }
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virtual uint16_t RegisterEndAddress() override { return 0xFFFF; }
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virtual void StreamState(bool saving) override
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{
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MMC3::StreamState(saving);
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Stream(_extraReg);
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}
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virtual void Reset(bool softReset) override
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{
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_extraReg = 0;
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UpdateState();
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}
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virtual void SelectCHRPage(uint16_t slot, uint16_t page, ChrMemoryType memoryType = ChrMemoryType::Default) override
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{
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if(_extraReg & 0x40) {
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page &= 0x7F;
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page |= (((_extraReg & 0x20) >> 3) | ((_extraReg & 0x10) >> 4) | ((_extraReg & 0x04) >> 1)) << 7;
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} else {
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page &= 0xFF;
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page |= (((_extraReg & 0x20) >> 3) | ((_extraReg & 0x10) >> 4)) << 7;
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}
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MMC3::SelectCHRPage(slot, page, memoryType);
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}
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virtual void SelectPRGPage(uint16_t slot, uint16_t page, PrgMemoryType memoryType = PrgMemoryType::PrgRom) override
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{
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if(_extraReg & 0x08) {
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page &= 0x0F;
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page |= (_extraReg & 0x07) << 4;
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} else {
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page &= 0x1F;
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page |= (_extraReg & 0x06) << 4;
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}
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MMC3::SelectPRGPage(slot, page, memoryType);
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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 < 0x8000) {
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if(CanWriteToWorkRam()) {
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if((_extraReg & 0x80) == 0) {
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_extraReg = value;
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UpdateState();
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} else {
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BaseMapper::WritePrgRam(addr, value);
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}
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}
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} else {
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MMC3::WriteRegister(addr, value);
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}
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}
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};
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