INT 15 - HUNTER 16 - SELECT POWER UP KEYS                                       
	AH = 71h
	BL = column
	BH = row
	AL = column switch (00h disable, 01h enable)
	CL = row switch (00h disable, 01h enable)
Return: AH = status
SeeAlso: AH=7Bh,AH=88h