Want to play the old games?
That's a link for an Atari 2600 Emulator. That website has Emulators for everything from Gamecube to NES to 2600.
Here's a link where you can download ROM's which are the old games themselves. This is a good site that has an excellent compendium of games for just about every system imaginable.
Just follow the read-me to use the software. Basically what you do is download the ROMs to the same folder that you unzip the Emulator to. When you want to play the specific game, you drag and drop the downloaded ROM onto the Emulator.exe icon which will then launch the game.
Pretty cool stuff.