Int 10 Fn 6F00  - Video - Video7 VGA,vega Vga,hp Ext BIOS - Installation   [V]

   AX = 6F00h
   BX = 0000h

Return: BX = 5637h ('V7') indicates Video7 VGA/VEGA VGA extensions are present
   BX = 4850h ('HP') indicates HP Extended BIOS video functions present

See Also: AX=6F01h,AX=6F02h,AX=6F03h,AX=6F04h,AX=6F05h