@ironic Here is my openmsx config for recalbox. I´ve created a folder on : /usr/emulators/openmsx/bin/ I put my openmsx binary file form retropie inside. Here you have the link http://s000.tinyupload.com/?file_id=22889548546368582728 2 . This libraries are needed to launch the emulator. Put them on /usr/lib http://s000.tinyupload.com/?file_id=15973386028963335785 Launch the emulator with ./openmsx After first launch go to /recalbox/share/system/.openMSX/ Put all this files inside the folder: http://s000.tinyupload.com/?file_id=17148959869931873621 Create a folder on /recalbox/share/roms/msx inside it you have to put your Msx roms Finally edit the file /recalbox/share_init/system/.emulationstation/es_systems.cfg Adding this lines: <system> <fullname>MSX OpenMsx</fullname> <name>msx</name> <path>/recalbox/share/roms/msx</path> <extension>.mx1 .MX1 .mx2 .MX2.rom .ROM</extension> <command>/recalbox/scripts/runcommand.sh 4 "/usr/emulators/openmsx/bin/openmsx %ROM%"</command> <platform>msx</platform> <theme>msx</theme> </system> P.D. Maybe you need chmod 0755 -R to all files and folders and chmod +x to openmsx binary file.