Int 10 Fn BF05  - Video - Compaq Extensions - Enable/disable Display       [b]

   AX = BF05h
   BH = new state of video
       00h off
       01h on

Note:  the 04/08/93 sytem ROM appears to use BL instead of BH; a future
     version of the list will provide more definite information

See Also: AH=12h/BL=36h,AX=BF04h