Method SetMemMode

source/LanguageCard.cpp:635–675

Set the global memmode. Support for GH#1495: . slot 0 LC set to: RAM write enabled, ROM read . slot 4 Saturn set to: RAM write protect, ROM read [*] (effectively disables the card) . no further LC switches are accessed, and DOS is copied to LC Since all LC/Saturns could be written to simultaneously, then we need to support the writes to slot 0 LC. [*] NB. Saturn has no ROM, so when set to "RO

// Since all LC/Saturns could be written to simultaneously, then we need to support the writes to slot 0 LC.
// [*] NB. Saturn has no ROM, so when set to "ROM read", then the bus isn't driven.
void LanguageCardManager::SetMemMode(const uint8_t slot)
{
	bool isAnyLCWithWritableHighRam = false;
	uint8_t slotWithWritableHighRam = SLOT0;

	// Scan all slots, looking for a LC/Saturn with writeable RAM
	for (UINT i = SLOT0; i < NUM_SLOTS; i++)
	{
		if (GetCardMgr().QuerySlot(i) == CT_LanguageCard || GetCardMgr().QuerySlot(i) == CT_LanguageCardIIe || GetCardMgr().QuerySlot(i) == CT_Saturn128K)
		{
			uint32_t lcMemMode = dynamic_cast<LanguageCardUnit&>(GetCardMgr().GetRef(i)).GetLCMemMode();
			if (lcMemMode & MF_WRITERAM)	// RAM writable (don't care if it's ROM or RAM that's readable)
			{
				isAnyLCWithWritableHighRam = true;
				slotWithWritableHighRam = i;

				// Favour the last accessed RAM card (as don't support writing to multiple RAM cards!)
				if (slotWithWritableHighRam == slot)
					break;
			}
		}
	}

	if (!isAnyLCWithWritableHighRam)
	{
		// Rd: ROM or RAM / Wr: discarded
		LanguageCardUnit& card = dynamic_cast<LanguageCardUnit&>(GetCardMgr().GetRef(slot));
		::SetMemMode((GetMemMode() & ~MF_LANGCARD_MASK) | (card.GetLCMemMode() & MF_LANGCARD_MASK));
		// SetMemMainLanguageCard() already done by calling-function's IO()
	}
	else
	{
		// Rd: ROM or RAM / Wr: RAM
		LanguageCardUnit& card = dynamic_cast<LanguageCardUnit&>(GetCardMgr().GetRef(slotWithWritableHighRam));
		::SetMemMode((GetMemMode() & ~MF_LANGCARD_MASK) | (card.GetLCMemMode() & MF_LANGCARD_MASK));
		if (slotWithWritableHighRam != slot)
			card.SetMainMemLanguageCardMemory();
	}

	MemUpdatePaging(0);	// Initialize=0
}

void LanguageCardManager::SetMemModeFromSnapshot(void)
{