[RadioAstronomer]

Depending on the game, some of those old 2600 carts can be worth major bucks. I kept my old Imsai 8080 just in case and now its quite a collector item.

[Springman]

I'll have to check, I do have an old pac-man and Laser Blast, not sure about the rest.

[luvbach1]

Depending on the game, some of those old 2600 carts can be worth major bucks.

What about carts to work on Atari 800s (don't think they work on anything else, but don't know)? I have Miner 2049r, Pac Man, Space Invaders, Missile Command, others, all working, as does computer (1982 vintage).