Nintendo 64 games.
It was the first game console I really played much of growing up. I'd go to my dads on the weekends and he had it there, so it was this magical time, playing Ocarina of Time and Mario Kart 64. I've collected nearly all the games I grew up with, as well as some I never played as a kid. I like having it, knowing that at any time I can play them, in their original forms on hardware. Emulation is great but playing on hardware just hits different.