PSX Emulator
PSX (Playstation 1) was first "bigger" console that had an emulator created to. As on March 2014, there are 5-10 PSX emulators that work, and most of them are free. ePSXe is the most popular one and you can download it here. It's quite good and many people use it to play old game titles.
Note that you'll need a gaming pad for better gaming experience - ePSXe supports it.
Note that you'll need a gaming pad for better gaming experience - ePSXe supports it.