INT 10 - VIDEO - Compaq Extensions - ENABLE/DISABLE DISPLAY
        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
SeeAlso: AH=12h/BL=36h,AX=BF04h

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