What's the oldest system you still use, and what keeps you coming back?

[Jumpin]

Now, if you're talking about the earliest generation of games I play regularly. That's the 8-bit generation. I play NES/GB games on and off all the time still - in the last 2 years or so, Captain Skyhawk, Cobra Triangle, Metroid, Final Fantasy Saga/Legend 2, Mystic Quest/Adventure of Mana, Dragon Quest 1-3, Final Fantasy 2 (FF1-3 in the past 3), and Super Mario Bros 3.