The system to adjust the firepower is to keep clicking on the key "DEL" until the power is the one wanted.
While "DEL" ? Because it is one of the 5 keys in TI-Basic (with directional keys) to have the property that when we keep clicking, the value of the key stays on "getKey". But the first time, it needs time for storing again the value. For example : when you click left, the cursor goes one notch to the left, some time passes, and then the cursor goes continually to the left.
So the program was too fast with a TI-84+ and the delay for getKey too short. The firepower wasn't able to exceed 1. I had the idea too slow down the speed of the increasing of the firepower, but it was too slow for TI-83/TI-82. So I added this option. Of course, you can enable it even on a TI-83/83 model, but the firepower will be slow.