Anyway, the theory is that you can connect 2 calculators to walky-talkies, and then transmit data readable only by a casio calculator, over a distance. This would greatly improve chatting on calculators. Correct me if any of the above info is incorrect.
then maybe the walky talky replaced by a small homemade 2-way radio which would connect neatly to the COMM port. It would only be about 1/2" by 1" by 1/4". the antenna could somehow be connected to the side of the calc.
The pinout for the 3pin cable is shown below. more info can be obtained at: http://pinouts.ru/Po...mm_pinout.shtml
Edited by mfischer, 15 April 2011 - 10:01 PM.