First, let me add a disclaimer that I have searched pretty extensively for a solution before posting here. If there is a good solution thread out there, please forgive me and post it here :)
I have gotten most all the features to work on my Pi running RetroPie (latest image, 1.8.1). But for whatever reason, I cannot get a controller to work with MAME. The keyboard registers, but not my controller. I have tried configuring the retroarch controls through the graphical interface, and I have also gone into the command line (sudo retroarch-joyconfig). In both cases, my controller registers and seems like it will work fine, but once I run MAME only the keyboard works (I have so far tried running KOF 94 and 95, as well as Final Fight). Is there an extra step in the process that I am missing that is particular to MAME?
Any help would be hugely appreciated! I really want to get my SNK on.
Oh, and my controller has worked so far for SNES and Genesis, so I am disinclined to believe that it is an issue with the controller itself.