Here is a site hosting a small (313 KB) emulator for ColecoVision ROMS. You can also download a free ROM package full of arcade games like Centipede, Frogger, Fury, Burger Time, Tapper, Football, Jungle Hunt, Baseball, Galaxian, Zaxxon, Star Trek, Super Donkey Kong Jr, Popeye, Donkey Kong, Donkey Kong Jr, Time Pilot, Cosmo Fighter, Qbert.

WEBSITE:
http://tripletsandus.com/80s/80s_games/coleco.htm.

Great games and a great little emulator. I couldn’t get some games to work but I didn’t spend too much time trying to figure it out either – most work just fine. Cosmo Fighter is a lot of fun! I haven’t had a chance to try them all out; there are enough games included to have a blast all weekend!