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62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
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#pragma once
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#include "stdafx.h"
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#include "MMC3.h"
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class MMC3_411 : public MMC3
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{
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private:
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uint8_t _exRegs[2];
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protected:
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virtual void InitMapper() override
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{
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AddRegisterRange(0x5000, 0x5FFF);
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MMC3::InitMapper();
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}
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virtual void Reset(bool softreset) override
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{
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_exRegs[0] = 0x80;
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_exRegs[1] = 0x82;
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MMC3::UpdateState();
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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 SelectCHRPage(uint16_t slot, uint16_t page, ChrMemoryType memoryType = ChrMemoryType::Default) override
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{
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page &= (_exRegs[1] & 2) ? 0xFF : 0x7F;
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MMC3::SelectCHRPage(slot, ((_exRegs[1] << 5) & 0x80) | ((_exRegs[0] << 4) & 0x100) | page);
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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 (_exRegs[0] & 0x40) { // NROM Mode
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uint8_t bank = ((_exRegs[1] >> 2) & 0x10) | (_exRegs[1] & 0x08) | (_exRegs[0] & 0x04) | ((_exRegs[0] >> 2) & 0x02) | (_exRegs[0] & 0x01);
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if (_exRegs[0] & 0x02) { // NROM-256
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SelectPrgPage4x(0, (bank & 0xFE) << 1);
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} else { // NROM-128
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MMC3::SelectPrgPage2x(0, bank << 1);
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MMC3::SelectPrgPage2x(1, bank << 1);
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}
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} else { // MMC3 Mode
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page &= (_exRegs[1] & 2) ? 0x1F : 0x0F;
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MMC3::SelectPRGPage(slot, ((_exRegs[1] >> 1) & 0x20) | ((_exRegs[1] << 1) & 0x10) | page);
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}
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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 <= 0x5FFF) {
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_exRegs[addr & 0x01] = value;
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MMC3::UpdatePrgMapping();
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MMC3::UpdateChrMapping();
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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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