INT 16 - PC-Cache v6+ - FLUSH CACHE AND DISABLE DELAYED WRITES                  
	AX = FFA5h
	CX = CCCCh
Return: AX = ??? (apparently either 0000h or sectors_in_cache - 5)
Note:	delayed writes are automatically disabled on EXECing
	  (see INT 21/AH=4Bh) a program named either WIN.CO? or DV.E??;
	  however, delayed writes are not automatically reenabled upon the
	  program's termination in v6.
SeeAlso: AX=FFA5h/CX=AAAAh,AX=FFA5h/CX=FFFFh