Technology changes so quickly that the devices we're using one day often end up in the back of the closet - or garage - not long after. But there's an upside to keeping all that junk: If you've been playing with tech toys for a few decades, you might just have some pretty valuable items collecting dust somewhere. Not every discarded PC or video game console is worth more than you paid for it, but a few iconic items are fetching high prices at auction.

This infographic from Portable Universe lays out some of the top retro tech profits. Now, who's up for a game of Pac-Man?

Money Behind Retro TechPortable Universe