I recently purchased this item at a flea market. It's a cassette port of Donkey Kong for the Coleco Adam that appears to have been released in 1984. It comes packaged in a cardboard box designed to look like the original arcade cabinet of the game. After purchasing the item, I tried to do some research on it. It was one of three arcade games that were given ports to the Adam with boxes designed after the original arcade cabinets. I only found a few pictures of the box on Google and found no current or completed listings of the game on eBay. The closest thing I found on eBay was a Zaxxon game in the cabinet-style box the was listed for about $500. I wanted to see if anybody knew about the history of the game or how much it is worth.