Int 6F Fn 08  - Hp Vectra Ex-bios - "f_get_byte" - Read A Byte Of Data Fr  [b]

   AH = 08h
   BP = driver ID (see #3412) for V_HPHIL (0114h), others
   ---if device is V_HPHIL---
   BX = device address indicator (see #3431)
   DH = HP HIL device major address
   DL = HP-HIL device register (00h-7Fh)

Return: AH = status (see #3415)
   AL = value read from device
   BP,DS destroyed
Desc:  generic read-byte function; for driver V_HPHIL, retrieves the value
     of a specific HP-HIL device register

Note:  this function is only available if the driver is in the open state
     (see AX=020Eh"SF_OPEN")

See Also: AH=06h"F_PUT_BYTE",AH=0Ah"F_PUT_BUFFER",AH=0Ch"F_GET_BUFFER"