Those limitations always baffled me for the TI-83/84 line. They weren't present in the TI-85/86 line. Lists were bounded only by system memory (both in capacity

Those limitations always baffled me for the TI-83/84 line. They weren't present in the TI-85/86 line. Lists were bounded only by system memory (both in capacity and number of lists), and variables could be up to 8 characters (still limited, but not as bad as only 1 letter names). The main limitation high school me ran into was when I wanted to implement some recursive programs and had to recreate the call stack using lists as the stack. It was effective, and certainly made understanding an actual call stack easier later on when I got to my CS courses. I stopped using it after 1999, though, when a kid I was tutoring (wasn't sure which one) stole it from me. Replaced it with an HP-48G, I had a lot more fun programming in RPL than BASIC (which I'd been using for close to a decade by that point in some form or another).