My first home video game was Pong on some pre-Atari system bought from JCPenney's in the 70s that also came with Blackjack and a drag racing game. I (mis)spent the 80s feeding quarters into Asteroids, Centipede, Space Invaders, Missile Command and Pac-Man. The first PC games I played in the 90s ran off of 5.25" and 3.5" floppies, Bard's Tale among them.
My favorite PC time sinks have been Gunship, Sid's Civilization franchise and off-shoots, Master of Orion (I and II), and the original Colonization.
Currently I'm a PC gamer and play Civ5 when I need to decompress...and have the time!