Mame input key mapping file

[Darkxceed]

Hello,

I have recalbox installed on an raspberry pi 3.
I want to enter the key mapping of mame with an editor.
I searched all the directories to find a config file where players 1-4 keys are mapped.
Where can I find the file which contains the keymapping?

greets,
Bart

[Substring]

@darkxceed it's the file that ppl want erased when htey accidentally changed some mappings there