Cannot configure second usb controller for mame

[Doom]

Hello,

I have recently started discovering Mame emulation. I have followed

on configuring a usb controller for Mame, and it certainly helped me. I followed his instructions and plugged a usb keyboard, hit tab and configured my controller and it worked!

My problem is that I am unable to configure a second usb controller. When I am setting up the right keys (in Input (general)) it simply does not recognize my second usb controller. I hit enter, press the key on the second controller but it does not register.

My second controller is configured and works perfectly on all the other emulators I am using on the Retropie, including Final Burn Alpha. I have not configured/changed anything in retroarch but from what I understand it is not linked to Mame emulation.

I have a Raspberry Pi 2 (unsure of which version) and use 2 iBuffalo usb controllers (SNES design). My Retropie was preloaded and I use a usb flash drive to put files on it. I do not really know how to modify settings using lines of code and navigating in folders other than from the main Emulation Station interface and I find some Retropie guides intimidating because of I my lack of knowledge in that field.

I hope someone here can help me set up my second usb controller. I am using mame4all.

Thank you.

[Doom]

Any help or information would be appreciated.

Thank you.

[BuZz]

Have you tried lr-mame2003? - which is a libretro emulator so the second controller should work out of the box. Not tested configuring a second controller with the standalone mame4all.