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64 lines
1.5 KiB
C++
64 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_430 : public MMC3
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{
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private:
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uint8_t _reg;
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protected:
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uint16_t RegisterStartAddress() override { return 0x6000; }
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uint16_t RegisterEndAddress() override { return 0xFFFF; }
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void InitMapper() override
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{
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MMC3::InitMapper();
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}
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void Reset(bool softreset) override
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{
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_reg = 0;
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MMC3::UpdateState();
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}
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void StreamState(bool saving) override
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{
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MMC3::StreamState(saving);
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Stream(_reg);
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}
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void SelectCHRPage(uint16_t slot, uint16_t page, ChrMemoryType memoryType = ChrMemoryType::Default) override
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{
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if(_reg & 0x04) {
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MMC3::SelectCHRPage(slot, ((_reg << 6) & 0x180) | (page & 0x7F), memoryType);
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} else {
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MMC3::SelectCHRPage(slot, ((_reg << 6) & 0x100) | (page & 0xFF), memoryType);
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}
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}
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void SelectPRGPage(uint16_t slot, uint16_t page, PrgMemoryType memoryType = PrgMemoryType::PrgRom) override
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{
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if(_reg & 0x08) {
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MMC3::SelectPRGPage(0, (_reg << 4) | ((MMC3::_registers[6] & ~0x02) & 0x0F));
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MMC3::SelectPRGPage(1, (_reg << 4) | ((MMC3::_registers[7] & ~0x02) & 0x0F));
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MMC3::SelectPRGPage(2, (_reg << 4) | ((MMC3::_registers[6] | 0x02) & 0x0F));
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MMC3::SelectPRGPage(3, (_reg << 4) | ((MMC3::_registers[7] | 0x02) & 0x0F));
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} else {
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MMC3::SelectPRGPage(slot, (_reg << 4) | (page & 0x0F));
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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 < 0x8000) {
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if(MMC3::CanWriteToWorkRam()) {
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_reg = (uint8_t)addr;
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MMC3::UpdatePrgMapping();
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MMC3::UpdateChrMapping();
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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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}; |