Int 10 Fn 4F06  - Vesa Supervga Bios V2.0+ - Get Maximum Scan Line Length  [V]

   AX = 4F06h
   BL = 03h

Return: AL = 4Fh if function supported
   AH = status
       00h successful
       01h failed
   BX = maximum bytes per scan line
   CX = maximum number of pixels per scan line

Notes: this function is valid in text modes, provided that pixel values are
     multiplied by the character cell width/height

See Also: AX=4F01h,AX=4F05h,AX=4F06h,AX=4F06h/BL=02h,AX=4F07h