I understand concepts for writing codes for programs that allow communication between two calculators (there are also great resources for this on this site), but I am curious as to the possibilities for wireless connections. I believe that there are IR modules available for the TI-89 Titanium, but I have not seen any similar device for any of the calculators in the TI-83 series that do not involve extensive, bulky, complicated, and possibly expensive external circuitry, especially circuitry involving additional Microcontrollers and sophisticated ICs. I was wondering if anyone has any suggestions, ideas, or experience in this area/field of knowledge. I was thinking something along the lines of a simple coil and maybe a few additional basic electronic components, like a diode and/or resistor, and MAYBE a transistor or two, as a transmitter and receiver. I was thinking, & if I am correct, the principle of a simple coil should be electrically sound as a wireless link, through the mere phenomenon of induction. I am, however, worried about attaching a coil to I/O jack with minimal extra circuitry (I might as well be shorting it out…).