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INT 10 - VESA SuperVGA BIOS 1.1 - GET/SET LOGICAL SCAN LINE LENGTH
        AX = 4F06h
        BL = 00h set scan line length
                CX = desired width in pixels
           = 01h get scan line length
Return: AL = 4Fh if function supported
        AH = status
            00h successful
            01h failed
        BX = bytes per scan line
        CX = number of pixels per scan line
        DX = maximum number of scan lines
Notes:  if the desired width is not achievable, the next larger width will be
          set
        the scan line may be wider than the visible area of the screen
        this function is valid in text modes, provided that values are
          multiplied by the character cell width/height
SeeAlso: AX=4F01h,AX=4F05h,AX=4F07h