Function MemReset

source/Memory.cpp:2294–2454

Called by: . MemInitialize() eg. on AppleWin start & restart (eg. h/w config changes) . ResetMachineState() eg. Power-cycle ('Apple-Go' button) . Snapshot_LoadState_v2()

// . ResetMachineState()	eg. Power-cycle ('Apple-Go' button)
// . Snapshot_LoadState_v2()
void MemReset()
{
	// INITIALIZE THE PAGING TABLES
	memset(memshadow, 0, 256*sizeof(LPBYTE));
	memset(memwrite , 0, 256*sizeof(LPBYTE));

	// INITIALIZE THE RAM IMAGES
	memset(memaux , 0, 0x10000);
	memset(memmain, 0, 0x10000);

	// Init the I/O ROM vars
	IO_SELECT = 0;
	INTC8ROM = false;
	g_eExpansionRomType = eExpRomNull;
	g_uPeripheralRomSlot = 0;

	memset(memdirty, 0, 0x100);

	memVidHD = NULL;

	g_uActiveBank = 0;	// Power-cycle sets RamWorks III to 64KiB bank-0 (GH#1414)

	//

	int iByte;

	// Memory is pseudo-initialized across various models of Apple ][ //e //c
	// We chose a random one for nostalgia's sake
	// To inspect:
	//   F2. Ctrl-F2. CALL-151, C050 C053 C057
	// OR
	//   F2, Ctrl-F2, F7, HGR
	uint32_t randTime = getRandomTime();
	MemoryInitPattern_e eMemoryInitPattern = static_cast<MemoryInitPattern_e>(g_nMemoryClearType);

	if (g_nMemoryClearType < 0)	// random
	{
		eMemoryInitPattern = static_cast<MemoryInitPattern_e>( randTime % NUM_MIP );

		// Don't use unless manually specified as a
		// few badly written programs will not work correctly
		// due to buffer overflows or not initializig memory before using.
		if( eMemoryInitPattern == MIP_PAGE_ADDRESS_LOW )
			eMemoryInitPattern = MIP_FF_FF_00_00;
	}

	switch( eMemoryInitPattern )
	{
		case MIP_FF_FF_00_00:
			for( iByte = 0x0000; iByte < 0xC000; iByte += 4 ) // NB. ODD 16-bit words are zero'd above...
			{
				memmain[ iByte+0 ] = 0xFF;
				memmain[ iByte+1 ] = 0xFF;
			}

			// Exceptions: xx28 xx29 xx68 xx69 Apple //e
			for( iByte = 0x0000; iByte < 0xC000; iByte += 512 )
			{