I used all of these as a kid, and they were the precursor to my C64 and C128. The TI 99/4A was the first real computer I ever used - real in the sense that it had a keyboard!
What impresses me about the TI 99/4A (besides its unusual microarchitecture) is that PLATO (or offline versions of much of its extensive and interesting courseware) was ported to it. Apparently it could act as a PLATO terminal as well.
musicale|1 month ago
https://arstechnica.com/gadgets/2023/03/plato-how-an-educati...
I don't know if it could play Moria or Empire though.
https://gamerant.com/plato-system-best-games/