Good companions, I followed a tutorial to add more systems to the recalbox in this case the SNES MSU- 1
This being the line that I added
<system>
<fullname>SNES MSU-1</fullname>
<name>snesmsu1</name>
<path>/recalbox/share/roms/snesmsu1</path>
<extension>.st .ST .smc .SMC .sfc .SFC .fig .FIG .zip .ZIP</extension>
<command>python /usr/lib/python2.7/site-packages/configgen/emulatorlauncher.pyc %CONTROLLERSCONFIG% -system %SYSTEM% -rom %ROM% -emulator %EMULATOR% -core %CORE% -ratio %RATIO% %NETPLAY%</command>
<platform>snesmsu1</platform>
<theme>snesmsu1</theme>
<emulators>
<emulator name="libretro">
<cores>
<core>snes9x</core>
</cores>
</emulator>
</emulators>
</system>
All right up there, I appear in the MENU, the games also, in advanced configuration of the emulator also appear the "core"
but when you give it "launch game" it pretends to load it but it returns me to the list of the games again. If I move the roms from snesmsu1 to snes if they work then it's not a problem for the roms ..
I'm using recalbox 6.0 in RPI 3b +
HELP
Pd: Translated from Spanish with google translator