mirror of
https://github.com/SourMesen/Mesen.git
synced 2024-05-20 05:01:03 -04:00
58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
#pragma once
|
|
#include "stdafx.h"
|
|
#include "MMC3.h"
|
|
|
|
class MMC3_123 : public MMC3
|
|
{
|
|
private:
|
|
const uint8_t _security[8] = { 0,3,1,5,6,7,2,4 };
|
|
uint8_t _exReg[2];
|
|
|
|
void UpdatePrgMapping() override
|
|
{
|
|
if(_exReg[0] & 0x40) {
|
|
uint8_t bank = (_exReg[0] & 0x05) | ((_exReg[0] & 0x08) >> 2) | ((_exReg[0] & 0x20) >> 2);
|
|
if(_exReg[0] & 0x02) {
|
|
SelectPrgPage4x(0, (bank & 0xFE) << 1);
|
|
} else {
|
|
SelectPrgPage2x(0, bank << 1);
|
|
SelectPrgPage2x(1, bank << 1);
|
|
}
|
|
} else {
|
|
MMC3::UpdatePrgMapping();
|
|
}
|
|
}
|
|
|
|
void InitMapper() override
|
|
{
|
|
MMC3::InitMapper();
|
|
|
|
_exReg[0] = _exReg[1] = 0;
|
|
AddRegisterRange(0x5001, 0x5FFF, MemoryOperation::Write);
|
|
}
|
|
|
|
void StreamState(bool saving) override
|
|
{
|
|
MMC3::StreamState(saving);
|
|
Stream(_exReg[0], _exReg[1]);
|
|
}
|
|
|
|
void WriteRegister(uint16_t addr, uint8_t value) override
|
|
{
|
|
if(addr < 0x8000 && addr & 0x0800) {
|
|
if(addr & 0x01) {
|
|
_exReg[1] = value;
|
|
} else {
|
|
_exReg[0] = value;
|
|
}
|
|
UpdatePrgMapping();
|
|
} else if(addr < 0xA000) {
|
|
switch(addr & 0x8001) {
|
|
case 0x8000: MMC3::WriteRegister(0x8000, (value & 0xC0) | (_security[value & 0x07])); break;
|
|
case 0x8001: MMC3::WriteRegister(0x8001, value); break;
|
|
}
|
|
} else {
|
|
MMC3::WriteRegister(addr, value);
|
|
}
|
|
}
|
|
}; |