This parameter enables the subsystem of eligible cores, and take all the parameters that the subsystem expects.
Basic usage: --subsystem=NAME
Actual usage seems to vary from core to core. From RetroArch help parameter:
Use a subsystem of the libretro core. Multiple content files are loaded as multiple arguments. If a content file is skipped, use a blank ("") command line argument. Content must be loaded in an order which depends on the particular subsystem used. See verbose log output to learn how a particular subsystem wants content to be loaded.
This parameter enables the subsystem of eligible cores, and take all the parameters that the subsystem expects.
Basic usage:
--subsystem=NAMEActual usage seems to vary from core to core. From RetroArch help parameter: