Int 10 Fn 4F15  - Vesa Vbe/dc (display Data Channel) - Installation Check  [V]

   AX = 4F15h
   BL = 00h
   ???

Return: AL = 4Fh if function supported
       AH = status
       00h successful
           ???
       01h failed
           ???

See Also: AX=4F15h/BL=01h,AX=4F15h/BL=02h