Int 2F Fn DF01  - Hyperdisk V4.50+ - Get Current Cache State               [c]

   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 #2778)
Range: AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh

See Also: AX=DF00h,AX=DF02h

Bitfields for HyperDisk caching flags:
Bit(s) Description (Table 2778)
 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