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81 lines
1.6 KiB
C++
81 lines
1.6 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "MMC3.h"
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class MMC3_114 : public MMC3
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{
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private:
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const uint8_t _security[8] = { 0,3,1,5,6,7,2,4 };
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uint8_t _exRegs[2];
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protected:
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virtual uint16_t RegisterStartAddress() override { return 0x5000; }
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virtual bool ForceMmc3RevAIrqs() override { return true; }
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void InitMapper() override
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{
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MMC3::InitMapper();
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_exRegs[0] = _exRegs[1] = 0;
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}
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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(_exRegs[0], _exRegs[1]);
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}
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virtual void UpdatePrgMapping() override
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{
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if(_exRegs[0] & 0x80) {
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SelectPrgPage2x(0, _exRegs[0] & 0x1F);
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SelectPrgPage2x(1, _exRegs[0] & 0x1F);
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} else {
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MMC3::UpdatePrgMapping();
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}
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}
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virtual void UpdateMirroring() override
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{
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//See $8000 writes below
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}
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virtual 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 0x4000: case 0x6000:
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if((addr & 0x07) == 0x00) {
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_exRegs[0] = value;
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UpdatePrgMapping();
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}
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break;
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case 0x8000:
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SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical);
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break;
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case 0xA000:
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value = (value & 0xC0) | _security[value & 0x07];
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_exRegs[1] = 1;
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MMC3::WriteRegister(0x8000, value);
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break;
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case 0xC000:
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if(_exRegs[1]) {
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_exRegs[1] = 0;
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MMC3::WriteRegister(0x8001, value);
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}
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break;
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case 0xE000:
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if(value > 0) {
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MMC3::WriteRegister(0xE001, value);
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MMC3::WriteRegister(0xC000, value);
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MMC3::WriteRegister(0xC001, value);
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} else {
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MMC3::WriteRegister(0xE000, value);
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}
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break;
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}
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}
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}; |