My friend and I are currently trying to set up a raspberry pi game machine using Retropie, and want to have windjammers on it. We're using Final Burn Alpha for Raspberry Pi to accomplish this, and so far have the game running just fun taking input from a USB SNES controller. Unfortunately we can't figure out how to enter the service menu in order to remove the time limit for matches. I'm unsure what the "L+R+Select" means on the piFBA page, because no keyboard I've used has a select button. We've tried pressing "L+R+TAB" and "Z+X+TAB" and neither works. Has anyone else accomplished this, and if so could you tell me how you did it? If you need to see our configurations I can try to find a way to post them.

Home Neo Geo systems have a Select button too, if that helps. Try and get what you're doing working on your cart and system then take that experience over to the emulator and replicate your efforts there.