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MMC5: Save EXRAM data in .sav file when board has a battery

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This commit is contained in:
Sour 2019-12-23 22:20:34 -05:00
parent c3b1b3effc
commit fd02e406b0
1 changed files with 38 additions and 11 deletions
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49
Core/MMC5.h
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@ -88,14 +88,15 @@ private:
// 1x 8kb : 0 0 0 0 - - - -
// 2x 8kb : 0 0 0 0 1 1 1 1
// 1x 32kb : 0 1 2 3 - - - -
int32_t realWorkRamSize = _workRamSize - MMC5::ExRamSize;
int32_t realWorkRamSize = _workRamSize - (HasBattery() ? 0 : MMC5::ExRamSize);
int32_t realSaveRamSize = _saveRamSize - (!HasBattery() ? 0 : MMC5::ExRamSize);
if(IsNes20() || _romInfo.IsInDatabase) {
memoryType = PrgMemoryType::WorkRam;
if(HasBattery() && (bankNumber <= 3 || _saveRamSize > 0x2000)) {
if(HasBattery() && (bankNumber <= 3 || realSaveRamSize > 0x2000)) {
memoryType = PrgMemoryType::SaveRam;
}
if(_saveRamSize + realWorkRamSize != 0x4000 && bankNumber >= 4) {
if(realSaveRamSize + realWorkRamSize != 0x4000 && bankNumber >= 4) {
//When not 2x 8kb (=16kb), banks 4/5/6/7 select the empty socket and return open bus
accessType = MemoryAccessType::NoAccess;
}
@ -109,6 +110,12 @@ private:
if(_workRamSize == MMC5::ExRamSize) {
accessType = MemoryAccessType::NoAccess;
}
} else if(memoryType == PrgMemoryType::SaveRam) {
//Properly mirror work ram (by ignoring the extra 1kb ExRAM section)
bankNumber &= (realSaveRamSize / 0x2000) - 1;
if(_saveRamSize == MMC5::ExRamSize) {
accessType = MemoryAccessType::NoAccess;
}
}
} else {
accessType = MemoryAccessType::Read;
@ -258,7 +265,8 @@ private:
for(int i = 0; i < 4; i++) {
uint8_t nametableId = nametables[(value >> (i * 2)) & 0x03];
if(nametableId == NtWorkRamIndex) {
SetPpuMemoryMapping(0x2000+i*0x400, 0x2000+i*0x400+0x3FF, _workRam+(_workRamSize-MMC5::ExRamSize), MemoryAccessType::ReadWrite);
uint8_t* source = HasBattery() ? (_saveRam + (_saveRamSize - MMC5::ExRamSize)) : (_workRam + (_workRamSize - MMC5::ExRamSize));
SetPpuMemoryMapping(0x2000+i*0x400, 0x2000+i*0x400+0x3FF, source, MemoryAccessType::ReadWrite);
} else {
SetNametable(i, nametableId);
}
@ -281,7 +289,12 @@ private:
//"Mode 3 - Read-only"
accessType = MemoryAccessType::Read;
}
SetCpuMemoryMapping(0x5C00, 0x5FFF, PrgMemoryType::WorkRam, _workRamSize - MMC5::ExRamSize, accessType);
if(HasBattery()) {
SetCpuMemoryMapping(0x5C00, 0x5FFF, PrgMemoryType::SaveRam, _saveRamSize - MMC5::ExRamSize, accessType);
} else {
SetCpuMemoryMapping(0x5C00, 0x5FFF, PrgMemoryType::WorkRam, _workRamSize - MMC5::ExRamSize, accessType);
}
SetNametableMapping(_nametableMapping);
}
@ -316,26 +329,40 @@ protected:
virtual uint32_t GetSaveRamSize() override
{
uint32_t size;
if(IsNes20()) {
return _romInfo.NesHeader.GetSaveRamSize();
size = _romInfo.NesHeader.GetSaveRamSize();
} else if(_romInfo.IsInDatabase) {
return _romInfo.DatabaseInfo.SaveRamSize;
size = _romInfo.DatabaseInfo.SaveRamSize;
} else {
//Emulate as if a single 64k block of work/save ram existed
return _romInfo.HasBattery ? 0x10000 : 0;
size = _romInfo.HasBattery ? 0x10000 : 0;
}
if(HasBattery()) {
//If there's a battery on the board, exram gets saved, too.
size += MMC5::ExRamSize;
}
return size;
}
virtual uint32_t GetWorkRamSize() override
{
uint32_t size;
if(IsNes20()) {
return _romInfo.NesHeader.GetWorkRamSize() + MMC5::ExRamSize;
size = _romInfo.NesHeader.GetWorkRamSize();
} else if(_romInfo.IsInDatabase) {
return _romInfo.DatabaseInfo.WorkRamSize + MMC5::ExRamSize;
size = _romInfo.DatabaseInfo.WorkRamSize;
} else {
//Emulate as if a single 64k block of work/save ram existed (+ 1kb of ExRAM)
return (_romInfo.HasBattery ? 0 : 0x10000) + MMC5::ExRamSize;
size = (_romInfo.HasBattery ? 0 : 0x10000);
}
if(!HasBattery()) {
size += MMC5::ExRamSize;
}
return size;
}
virtual bool AllowRegisterRead() override { return true; }