All is in the title :lol:
beetle-psx is RetroArch’s official port of mednafen-psx (name changed at Rypheca’s request to avoid support confusion). It has some patches to make it play nicer with RetroArch/libretro, as well as some things added/removed, such as the addition of pcsx-r’s widescreen hack and the removal of the deinterlacing stuff (we have shaders for that).
the mednafen-psx repo on github is a “shallow fork” that is closer to upstream and it’s only for dev purposes.
Ok thanks for your infos.