now THIS is funny. almost pissed myself in tears. the mario game was a bit much, nearly blew my ears out and my geq went off the scale. one way to keep the 2600 in the game. (grew up with the woody, don't own a 2600 anymore, gave it away with the games it had. about forty iirc)
I found that there is a Halo 2600. This one is a hack of another Atari made to look like Zelda. http://www.atariage.com/hack_page.html?SystemID=2600&SoftwareHackID=139
Too bad cause it's the most well known (also I know Halo 2600 was released as a cart, I dunno about the others).
I might actually seek out the Mario & Zippy ones to give them a shot. Probably not too much there, but they look like simple fun that could kill an hour or so.