INT 2F - HyperDisk v4.50+ - GET CURRENT CACHE STATE                             
	AX = DF01h
	BX = 4448h ('DH')
Return: AX = 0000h if function supported
	    BX = number of cache buffers in use
	    CX = number of cache buffers which have been modified
	    DL = caching flags (see #03106)
Range:	AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh
SeeAlso: AX=DF00h,AX=DF02h


Bitfields for HyperDisk caching flags:
Bit(s)	Description	(Table 03106)
 0	staged writes enabled for floppy disks
 1	staged writes enabled for hard disks
 2	writes verified on floppy disks
 3	writes verified on hard disks
 4	reserved (0)
 5	reserved (0)
 6	floppy caching enabled
 7	all caching functions enabled