INT 15 - HUNTER 16 - GET/SET CHARGER TEMPERATURE OVERRIDE                       
	AH = 8Bh
	AL = function
	    00h get
		Return:	BH = Maximum charging temperature
				Temp = -20 + (n * 0.63) degrees Centigrade
			BL = Minimum charging temperature
	    else set
		BH = maximum charging temperature (as above)
		BL = minimum charging temperature (as above)
Return: AH = status
	    00h success
	    FFh failure
Desc:	get/set the temperature interval within which the charger should
	  operate