So to access this "bug" What I did was, go to the stat menu, then to Calc, and then pressed "+" on "Med-Med".
This of course, enters help mode.
After this I went into the list menu (while still in help mode) and added L1.
After adding L1 it said "Med-Med L1" and was still on the help menu.
I then quit the menu using 2nd and Quit, and then proceeds unusual text.
the first option in the menu says;
8*8*8*8*
(* are black boxes)
scrolling down will make other entries pop into existence.
The first several ones showed up blank, while the last 5 were my 5 top custom lists (AAA, ABA, ABB, etc.) with a "]" preceding each.
Scrolling back up the menu gave new results too. The first four entries were, again, preceded by a "]" and had a single (seemingly random) variables after each, including a blank first entry.
I was mostly curious what this is, and if it could be used to do anything "fun". (i.e. completely screwing up my calculator)
If I were to guess myself, I would say it is either garbage code from data stored in the calculators ram or possibly coded values that, if I were to enter one, would execute or change fundamental lines of code in the calculator. (however I would assume probably the former