In high school I programmed a mini-RPG on a TI-85. It actually was quite a lot of fun (the programming, not so much the game). In our last year I think we could

In high school I programmed a mini-RPG on a TI-85. It actually was quite a lot of fun (the programming, not so much the game). In our last year I think we could also buy either a TI-89 or TI-92 (which was quite the behemoth). In our school the math teachers were free to choose between TI and HP calculators, so we had some other classes / groups that had to calculate with reverse polish notation. At that time I laughed at this idea, thinking why would anyone choose this over infix notation. Then years later, after learning LISP and prefix notation, I laughed at my dumb younger self. Incredible that TI still reigns supreme.