My systems; (favorite games):
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Atari 2600; (River Raid, Pac-Man, Combat, Centipede, Super Breakout, Pong)
Nintendo Entertainment System; (Super Mario I and III)
Sega Mastersystem; (Chopperlift, Super Hang On)
Sega Genesis I (x2), II, and III;
(Any and all Sonic games, Vectorman I and II, Cool Spot, Decap Attack, NBA Jam)
Super NES; (Donkey Kong Country I, II, and III, NHL 93, Mario All-Stars)
Sega Saturn; (Virtua Cop I and II, Virtua Fighter II, NHL All Star Hockey 98, Nights)
N64 (x2); (Mario 64, Perfect Dark, NHL 99, Tony Hawk I and II)
Sega Dreamcast; (Tony Hawk 2)
Playstation II (x2); (Every GTA title from III onward, NHL 2002 and 2004, every Tony Hawk from 3 onward)
Xbox 360; (GTA IV, Sonic's Sega Genesis Collection, plus: Halo I and Tony Hawk 2x from the original Xbox)

Oh, and my handhelds:
Game Boy; (Donkey Kong Land - all of them)
Sega Game Gear (blue); (Every Sonic title)
Game Boy Color; (Tetris DX, Star Wars Pod Racer)
Game Boy Advance; (All the retro Nintendo releases that I own, Sonic 2, Doom)

And, yes, I do have a PC, with mostly older games:
(Warcraft II and III, Doom and Doom II, Roller Coaster Tycoon, SimCity 3000, Tetris, Solitaire, Sonic Games, Tony Hawk Games, GTA III, VC, and SA, and the really old ones: Sammy the Snake, Solitaire Jewel Thief, Oregon Trail, and Gorillas )