The TI-Nspire has a serial interface in the dock connector at the bottom of the calculator. The easiest way to access this reliably is to simply solder a wire onto it but that’s obviously not an option for some people. A few people in the community have come up with some interesting designs for a home made adapter.

Here’s a simple and reliable adapter that I made out of tape, cardboard and some wires to replace my old, ugly, unreliable adapter.