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Mapper 245 fixes (fixes Dragon Quest VII (Ch))

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This commit is contained in:
Souryo 2016-10-20 18:13:36 -04:00
parent 7f43628693
commit 7cf5696305
2 changed files with 22 additions and 7 deletions
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2
Core/MMC3.h
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@ -22,7 +22,6 @@ class MMC3 : public BaseMapper
};
uint8_t _currentRegister;
uint8_t _prgMode;
bool _wramEnabled;
bool _wramWriteProtected;
@ -69,6 +68,7 @@ class MMC3 : public BaseMapper
uint8_t _irqCounter;
bool _irqReload;
bool _irqEnabled;
uint8_t _prgMode;
uint8_t _chrMode;
uint8_t _registers[8];

27
Core/MMC3_245.h
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@ -5,13 +5,8 @@
class MMC3_245 : public MMC3
{
protected:
virtual void UpdateState()
virtual void UpdateState() override
{
uint8_t orValue = _registers[0] & 0x01 ? 0x40 : 0x00;
_registers[6] = (_registers[6] & 0x3F) | orValue;
_registers[7] = (_registers[7] & 0x3F) | orValue;
MMC3::UpdateState();
if(HasChrRam()) {
@ -24,4 +19,24 @@ protected:
}
}
}
virtual void UpdatePrgMapping() override
{
uint8_t orValue = _registers[0] & 0x02 ? 0x40 : 0x00;
_registers[6] = (_registers[6] & 0x3F) | orValue;
_registers[7] = (_registers[7] & 0x3F) | orValue;
uint16_t lastPageInBlock = (GetPRGPageCount() >= 0x40 ? (0x3F | orValue) : -1);
if(_prgMode == 0) {
SelectPRGPage(0, _registers[6]);
SelectPRGPage(1, _registers[7]);
SelectPRGPage(2, lastPageInBlock - 1);
SelectPRGPage(3, lastPageInBlock);
} else if(_prgMode == 1) {
SelectPRGPage(0, lastPageInBlock - 1);
SelectPRGPage(1, _registers[7]);
SelectPRGPage(2, _registers[6]);
SelectPRGPage(3, lastPageInBlock);
}
}
};