I was with Prodigy from 1990 -1996. Prodigy did not natively support the PCjr but PC Enterprises modified the Tandy driver to work with the PCjr. If you had the Tandy Mod you could run Prodigy in Tandy mode natively. The PCjr ran Prodigy beautifully especially if you had a hard drive. I originally had a 2400 baud modem, which was the maximum that the local Tymnet supported. Sometime around 1994 Tymnet upgraded the local node to 9600. I used the PCjr until 1993 when I upgraded to a 386.
I had a Prodigy T-shirt that I bought from Prodigy on Prodigy. It was my first online purchase. I have been looking for one on ebay to no avail, though I did find the below pin.

