As a child of the 70s, we didn't have a home computer, and the game console I had had Pong! I shit you not. Eventually, my brother and I did get a Sega Odyssey for X-mas one year.
No, the games that hold nostalgia for me are old rpgs, board games, and actual coin-op arcade games. My favorites as a kid were...
D&D, Call of Cthulhu (still a huge favorite), Marvel Superheroes, Axis & Allies, and Squad Leader. A friend of mine had a huge collection of Lord of the Rings minis, and he constructed a terrain board, (I think it was a 4x8 or 4x6 board), and we'd play our own version of mini wars with these huge LotR armies.