I had a TI-99/4A! I coded a game for it, you ran around fighting robots and you could find a blaster and a jetpack.
The TI-99/4A had a lot of techical problems which killed its performance. They released a little module that you could insert into the game slot, then you insert the game into the module - this improved the performance drastically. Unfortunately I only heard about it many years later, I didn’t know about it at the time.
Somebody wrote an emulator which lets you run TI-99/4A games under windows or linux and I once tinkered with that and got my own game up and running again.