I have been working this out for the past couple of days. I have a bios file, 5501 the md5 checks out and my rips load up when using retroarch, but in emulationstation using the same core the games do not load. What did I do wrong? here is my ps1 entry from my es_systems.cfg
<system> <name>psx</name> <fullname>Sony PSX</fullname> <path>~/ConsoleGames/SonyPS1</path> <extension>.iso .ISO .bin .BIN</extension> <command>retroarch -L /usr/lib/libretro/mednafen_psx_libretro.so %ROM%</command> <platform>psx</platform> <theme>psx</theme> </system>