Wire a 16ch BCD switch to inputs 1 through 4 on the 50 pin and I forget if the switch grounds them or if you pull them high but I can check if needed. Then you need some wildcard instructions to tell the station to switch to a particular channel when the inputs change state. Then program the station with different channels and you can change frequencies or change power levels, PL tones or anything you can dream up. You can select up to 15 channels.
