Int 10 Fn 4E04  - Vesa Xga Bios Extensions - Return Current Video Mode     [V]

   AX = 4E04h
   DX = XGA handle

Return: AL = 4Eh if function supported
   AH = status
       00h  function successful
       BX??? = current mode
       else error code

See Also: AH=0Fh,AX=4E03h,AX=4F03h