Int 15 Fn 8B  - Hunter 16 - Get/set Charger Temperature Override           [b]

   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