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 below)

Note:  AH=DFh is the default; if it is already in use by some other program,
     HyperWare programs then scan multiplex numbers from C0h through FFh

See Also: AX=DF00h,AX=DF02h

Bitfields for caching flags:
 bit 0 staged writes enabled for floppy disks
 bit 1 staged writes enabled for hard disks
 bit 2 writes verified on floppy disks
 bit 3 writes verified on hard disks
 bit 4 reserved (0)
 bit 5 reserved (0)
 bit 6 floppy caching enabled
 bit 7 all caching functions enabled