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https://github.com/SourMesen/Mesen.git
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101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Kaiser202 : public BaseMapper
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{
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uint16_t _irqReloadValue;
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uint16_t _irqCounter;
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bool _irqEnabled;
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uint8_t _selectedReg;
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uint8_t _prgRegs[4];
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protected:
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virtual uint16_t GetPRGPageSize() override { return 0x2000; }
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virtual uint16_t GetCHRPageSize() override { return 0x0400; }
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void InitMapper() override
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{
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_irqReloadValue = 0;
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_irqCounter = 0;
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_irqEnabled = 0;
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_selectedReg = 0;
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memset(_prgRegs, 0, sizeof(_prgRegs));
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SelectPRGPage(3, -1);
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}
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void StreamState(bool saving) override
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{
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BaseMapper::StreamState(saving);
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Stream(_irqReloadValue, _irqCounter, _irqEnabled, _selectedReg, _prgRegs[0], _prgRegs[1], _prgRegs[2], _prgRegs[3]);
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if(!saving) {
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SetCpuMemoryMapping(0x6000, 0x7FFF, _prgRegs[3], PrgMemoryType::PrgRom, MemoryAccessType::ReadWrite);
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}
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}
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void ProcessCpuClock() override
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{
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if(_irqEnabled) {
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_irqCounter++;
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if(_irqCounter == 0xFFFF) {
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_irqCounter = _irqReloadValue;
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_console->GetCpu()->SetIrqSource(IRQSource::External);
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}
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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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switch(addr & 0xF000) {
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case 0x8000: _irqReloadValue = (_irqReloadValue & 0xFFF0) | (value & 0x0F); break;
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case 0x9000: _irqReloadValue = (_irqReloadValue & 0xFF0F) | ((value & 0x0F) << 4); break;
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case 0xA000: _irqReloadValue = (_irqReloadValue & 0xF0FF) | ((value & 0x0F) << 8); break;
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case 0xB000: _irqReloadValue = (_irqReloadValue & 0x0FFF) | ((value & 0x0F) << 12); break;
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case 0xC000:
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_irqEnabled = (value != 0);
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if(_irqEnabled) {
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_irqCounter = _irqReloadValue;
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}
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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break;
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case 0xD000: _console->GetCpu()->ClearIrqSource(IRQSource::External); break;
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case 0xE000: _selectedReg = (value & 0x0F) - 1; break;
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case 0xF000:
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if(_selectedReg < 3) {
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_prgRegs[_selectedReg] = ((_prgRegs[_selectedReg]) & 0x10) | (value & 0x0F);
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} else if(_selectedReg < 4) {
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//For Kaiser7032 (Mapper 142)
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_prgRegs[_selectedReg] = value;
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SetCpuMemoryMapping(0x6000, 0x7FFF, value, PrgMemoryType::PrgRom, MemoryAccessType::ReadWrite);
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}
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switch(addr & 0xFC00) {
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case 0xF000: {
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uint8_t bank = addr & 0x03;
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if(bank < 3) {
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_prgRegs[bank] = (value & 0x10) | (_prgRegs[bank] & 0x0F);
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}
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break;
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}
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case 0xF800:
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SetMirroringType(value & 0x01 ? MirroringType::Vertical : MirroringType::Horizontal);
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break;
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case 0xFC00:
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SelectCHRPage(addr & 0x07, value);
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break;
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}
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SelectPRGPage(0, _prgRegs[0]);
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SelectPRGPage(1, _prgRegs[1]);
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SelectPRGPage(2, _prgRegs[2]);
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break;
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}
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}
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}; |