Homepage › Forums › RetroPie Project › Controller Configuration in RetroPie › LR-MAME. How to set custom controls? › Reply To: LR-MAME. How to set custom controls?
there’s no point mapping the tab key. it won’t save any rebindings. see https://github.com/libretro/mame2003-libretro/issues/11
use the given retroarch cfg mappings to remap your controls.