Core Name:Genesis_Plus_GX
http://wiki.libretro.com/index.php?title=Genesis_Plus_GX

To play custom core :

copy the core file "#Cores/Genesis-Plus-GX/libcore-nes.so" from the "LOAD ROM" menu.

To play CD-ROM :

copy BIOS file "#Config/(biosfile)" from the "LOAD ROM" menu.(at once)

bios_CD_E.bin (MegaCD EU BIOS)
bios_CD_U.bin (SegaCD US BIOS)
bios_CD_J.bin (MegaCD JP BIOS)

To play original core :

restart RetroN5.

