Method IO

source/LanguageCard.cpp:113–169

}

BYTE __stdcall LanguageCardUnit::IO(WORD PC, WORD uAddr, BYTE bWrite, BYTE uValue, ULONG nExecutedCycles)
{
	UINT uSlot = ((uAddr & 0xff) >> 4) - 8;
	LanguageCardUnit* pLC = (LanguageCardUnit*) MemGetSlotParameters(uSlot);
	_ASSERT(uSlot == SLOT0);
#if DEBUG_LC_ACCESS
	LogOutput("S%d: %04X (PC=%04X)\n", uSlot, uAddr, PC);
#endif

	UINT memmode = pLC->GetLCMemMode();
	UINT lastmemmode = memmode;
	memmode &= ~(MF_BANK2 | MF_HIGHRAM);

	if (!(uAddr & 8))
		memmode |= MF_BANK2;

	if (((uAddr & 2) >> 1) == (uAddr & 1))
		memmode |= MF_HIGHRAM;

	if (uAddr & 1)	// GH#392
	{
		if (!bWrite && pLC->GetLastRamWrite())
		{
			memmode |= MF_WRITERAM; // UTAIIe:5-23
		}
		else if (bWrite && pLC->GetLastRamWrite() && pLC->IsOpcodeRMWabs(uAddr))	// GH#700
		{
			memmode |= MF_WRITERAM;
		}
	}
	else
	{
		memmode &= ~MF_WRITERAM; // UTAIIe:5-23
	}

	pLC->SetLastRamWrite( ((uAddr & 1) && !bWrite) ); // UTAIIe:5-23
	pLC->SetLCMemMode(memmode);

	const bool bCardChanged = GetCardMgr().GetLanguageCardMgr().GetLastSlotToSetMainMemLC() != SLOT0;
	if (bCardChanged)
		pLC->SetMainMemLanguageCardMemory();

	//

	if (MemOptimizeForModeChanging(PC, uAddr))
		return bWrite ? 0 : MemReadFloatingBus(nExecutedCycles);

	// IF THE MEMORY PAGING MODE HAS CHANGED, UPDATE OUR MEMORY IMAGES AND
	// WRITE TABLES.
	if ((lastmemmode != memmode) || bCardChanged)
	{
		// NB. Always SetMemMode() - locally may be same, but card may've changed
		GetCardMgr().GetLanguageCardMgr().SetMemMode(uSlot);
	}

	return bWrite ? 0 : MemReadFloatingBus(nExecutedCycles);
}