Web site:(taken from http://code.google.com/p/smsplus-gx/)
This is a port of SMS Plus, an open-source & portable Sega Master System / Game Gear emulator originally developed by Charles MacDonald, now running on the Gamecube and Wii through libogc & devkitpro.
Please note that the original code has been slightly modifed to improve game compatibility, emulation accuracy as well as adding support for extra peripherals. SMS Plus now also supports SG-1000 and Colecovision games !
If you want to port SMS Plus to another platform, be sure to check the updated core on SVN and give me some feedback.
Read the included user manual for additional informations.
For optimal experience, I'd recommend using these Genesis/SMS adapters made by Raphnet technologies.
If you like this project and would like to support it, you may donate via Paypal. All founds donated will be used to help further development by purchasing equipments such as additional controllers, debugging tools,...