If you want to relive those glorious moments in front of the TV playing classics like Super Mario Kart, Donkey Kong Country, Megaman, and The Legend of Zelda, you should try bsnes, a fantastic emulator for the Super Nintendo console.
The main feature of this emulator is its robustness: it’s capable of successfully emulating more than 99% of the games available for Super Nintendo (99.25%, to be exact). The author explains on his webpage that the only two games with known bugs are Koushein 2 and Unirally.
The only other thing you may have trouble with is the emulator’s important minimum requirements: a AMD Athlon at 1.67 Ghz or a Pentium IV at 2 Ghz with 24 Mbs of RAM memory.
bsnes is an emulator made from scratch that allows you to perform the same operations as any other, similar program: change the keys associated with controls, change video properties and game speed, etc.