Int 6F Fn 06  - Hp Vectra Ex-bios - "f_put_byte" - Write A Byte Of Data T  [b]

   AH = 06h
   BP = driver ID (see #3412) for V_HPHIL, others
   AL = value to output
   ---if driver 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)
   BP,DS destroyed
Desc:  output a byte to 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=04h"HP Vectra",AH=08h"F_GET_BYTE",AH=0Ah"F_PUT_BUFFER"