C'est bon au temps pour moi...
Je n'avais pas vu que RB avait recreer automatiquement une arbo sur la 2 eme carte. J'ai donc glissé mon dossier roms au bon endroit et c'est bon.
Incident clos.

@Argonautic hi
i suggest you use the DosBox Pure core and the exodos romset, with zip files of course.

Yes of yourse 😉

I can't tell you why the controllers behave like that either. I did some research on this but didn't find anything really useful. I'm thinking about switching to a different USB encoder anyway (2 player board). But for now I'm happy and it works...both on the RPI4 and on my new Mini PC. As I said, thank you very much for your great help 👍 😊 👌 !

I'm failling to pair my XBOX one controller with a RPI4 as well. Using Recalbox 7.2 (version 8 does not work for me, black screen, seems not to boot). The controller shows up during BT devices discovery but the pairing fails.

I used retropie with xpadneo driver before, which worked well.

@misterb-0

MicroSD Cards 256Go

Test with an original, 16gb class 10 Sd card, and check if the problem still happens.

SD cards of questionable origin, of class less than 10, and greater than 64gb, are not recommended, ideally 16gb SD cards for the system, and storing the ROMS on an external USB device.

@ebsigma Please, don't SPAM:
https://forum.recalbox.com/topic/24221/no-funciona-mando-en-juegos-de-psx

that helped. thanks. i have to rename all the games after the scrape unfortunately... i mean i have to delete endings like "world" "asia" etc.
thanks for your help