Reply To: RetroPie 2.6 – Mame libretro retroarch settings per game

[Floob]

For mame-libretro on 2.6 you can override the default controller by putting settings here:
/opt/retropie/configs/mame/retroarch.cfg

More details here:

MAME versions and romsets on RetroPie

Check a video to see how to manage controllers

Some more MK info

Input Mapping for Dip Switches / Service Mode on lr-imame4all