INT 15 - HUNTER 16 - SET CONTRAST POWER UP STATE
AH = 75h
AL = new level
01h off
02h unchanged
03h change level
BL = desired level (00h-7Fh)
Return: AH = status
Desc: select the LCD(Liquid Crystal Display) contrast level to use when the Hunter is next turned on
SeeAlso: AH=63h,AH=74h