My family got one for Christmas from my uncle. I think I was around 3 ('81). Good times:
- Programming stuff in BASIC was super easy, and allowed even for a young kid to mess around. I love how you'd type "goodbye" to go back to the main menu.
- I think it used typical serial controllers, so they were easy to find. We also used the speech synthesizer and a cassette drive. I remember the 300 seconds of odd noises as my TI booted up a cassette game.
- Some of the games we had: Dig Dug, Parsec, some text-based Pirate game, Tunnels of Doom, Hunt The Wumpus, TI Invaders (Space Invaders), Munch Man (awesome Pac-Man clone), Super Demon Attack, Defender, Picnic Paranoia, A-Maze-Ing, some kiddie math games, and Shamus.
- At least one of my folks' friends had it, too. We played Alpiner over there sometimes.
I played Tunnels of Doom on some TI emulator a while back. Still a great dungeon-crawler. I'll always have a soft spot for my first computer/game system.