Bon après plusieurs essaies c'est ma trackball qui est défectueuse car après l’achat d'une autre celle si est reconnue
Donc pour résumé n'acheter pas le moins cher car c'est de la mauvaise qualité 😉

@rastaman1201

One more thing to add about editing the systemlist.xml in /recalbox/share/system/.emulationstation/, if you just want to add additional system(s) you don't need any of the other system information in the file, just the new system(s) info you want to add. For example I added a new system for all the trackball games on my arcade, I kept the mame systemlist information in the file and deleted the rest of the info in the file, I then edited the mame system info by changing the fullname, path, and theme. I also changed a few characters in the uuid number/letter chain to make it unique. I'm pretty sure this is also a necessary thing you need to do.

@rastaman1201
Hi here with an update, the trackball works great with Golden Tee now, I just need to tone down the analog sensitivity to the lowest setting.

@keimamoru Voyez si cela aide :
https://forum.recalbox.com/topic/23478/ajouter-une-souris-sous-mame-pour-gestion-spinner-et-trackball

I managed to fix this, in RetroArch under Settings, Drivers, I changed Input & Controller to "udev"...... worked perfectly now. Hopefully someone else finds this useful. Thanks.

@unscathed Did you set whatever is needed to use trackb***s in controls and/or core options ? I'm pretty sure mame2003+ supports trackb***s as long as you set it properly. For reference, FBNeo requires changes in Quick Menu > Controls (device types).

@ranpar1 @Bernie-ran thanks to both of you guys 🙂

@substring thats great thanks. I will keep you posted. I also found this link might be helpful -

https://retropie.org.uk/forum/topic/14283/getting-trackball-to-work-with-mame/13

Pour info, le "Kensington - 64327eu - Orbit Optical Trackball - Noir/Argent" est pleinement opérationnel sur ScummVM... les tentacules n'ont qu'à bien se tenir !
Seul défaut, la boule n'est pas clipsée / retenue, ce qui est un peu ennuyeux lorsqu'on pose le trackball sur un control panel déjà surchargé de boutons et en pente, de surcroit...

Donc pour résumer : RPI2 avec dongle wifi + dongle sans fil mini clavier + xin-mo usb + trackball usb = OK ...après y'a pu de place !

Adding a trackball would require dedicated GPIO pins and the ability to translate it like a mouse ball.  It's possible and that would be the way to do it, but I don't know how to achieve it directly.  There was a project which I saw someone had built, but I can't remember how it was put together. Now, if possible and if you can get a mouse to work, you MIGHT just see if you can wire a USB mouse board (ball type) to the trackball and see what comes out.  You could even get two more buttons out of the deal if it goes well. With that said, if all of your buttons are GPIO, you should be alright.  If not, you'll need to converse with the MAME designers probably.