Hello, I created a wireless link between two calculators and was able to have wireless chat. I was only able to find one other tutorial on the internet located here: http://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2011/mdb236_wpb35/mdb236_wpb35/TI%20Calculator%20Wireless%20Chat.htm I thought there could be an easier and simpler way to this, so I used two arduino's and two xbee's. To keep things cheap I made my own arduino for about $10 plus the $20 for the xbee. The total was around $60, but you could opt for a cheaper radio, however the xbee's are really simple to use.There is a great guide on the on how the calculator's link port works here: http://www.ticalc.org/archives/files/fileinfo/247/24750.html Be sure to read hardware.html. This was extremely helpful because I am emulating the ti protocol. All I did was port the code from the guide to the arduino language, so there may be some bugs, or better ways to write it. Also there is no timeout or error check part in the code so you will have to manually reset the microcontroller if there is an error in transmission.Pictures are below and my code is available at https://github.com/mitch8/wirelessTI-84 Thanks,Mitch