Apart from early arcade games and pinballs...
My first gaming devices were:
1) Radio Shack TV Scoreboard (Pong game w/Light Gun)
2) An LED Football portable game (didn't like football but it's a game!)
3) Merlin
Followed by 2600, Pac-Man watch, various Radio Shack LCD games, VIC-20, Chase'N'Counter, Dad's IBM Turbo AT (he did CAD work so EGA instead of CGA), TRS-80 CoCo3, C-64, Amiga, SMS, SNES, etc...