I love emulators, and every time I see something about this, I'm so excited. If this is your case...
A user of this thread called Carles Oriol, presents an Raspbian image to play the following emulators:
The sound is not very good, but that's we know because the sound card and the support that has the Raspberry.
Enjoy!
Web: chameleon.enging.com
Torrent: torrent
Source: raspi.tv