Int 15 Fn 47  U - Hp 100lx/200lx - Get/set Display Contrast                [b]

   AH = 47h
   AL = subfunction
      00h set contrast
       BL = new contrast
           (00h-0Fh, 0Fh is darkest, 10h-FFh are same as 0Fh)
      other get current contrast

Return: AL = contrast (00h-0Fh, 0Fh is darkest)

Note:  may be for backward compatibility with HP95LX, as INT 15/AH=62h does
     substantially the same thing as this function

See Also: AH=45h"HP",AH=48h"HP",AH=62h"HP"