I think that's because the 1 PS4 controller appears to generate 2 input devices, so the numbering is skewed. Try the workaround proposed here.

@mitu ok I think I know what to do. Should I edit the file to the keycodes?

Thanks for your help and advice. I got it working on a config that isn't perfect in the menu, but works great in game. With the other system emulators working fine my only concern right now is the speed of the N64 games, and whether or not I want to attempt to overclock my Pi 3 B+.

@hhromic Amazing ! will give it a try haha funny , i cant change it to lower . maybe upper .

Look in the Docs page of the system to see what ROM extensions are accepted by the emulator and make sure you use the same format. The RetroPie image comes with the Mupen64plus installed, so it should be enough to copy the ROMs in the n64 folder and restart Emulationstation. I remember playing N64 games on my 2004 laptop and I got great performance, so I would hope the support is fairly strong now. Not so much, N64 is far from perfect and not all games are running well.

@syc0maniac Is there a specific setting you are trying to alter?

@tackskull I dunno, depends on the core and your hardware specs. Check the libtretro.com docs for your core and see if there are any notes about requirements. As noted in the docs This emulator is supplied for people who are running RetroPie on more powerful x86 systems.

@nightfire /opt/retropie/configs/n64/mupen64plus.cfg edits the standard mupen64plus emulator settings. At my level of expertise(or really a lack thereof) I am unsure how the cores are separated but the es_systems.cfg also lists editable extensions and I would presume if the mupen64plus.cfg doesn't also affect the libreto version, then this probably does. I base my info off of exploration and reading the docs : https://retropie.org.uk/docs/Nintendo-64/ ; so I could be wrong.

@Spartacus as the fellows told you before me, the main problem on loading the N64 games could be the extension. If the files are zipped, unzip them and throw those files into the proper folder. The N64 extension should .n64 .v64 or .z64. Most of the games should work properly depending on the configuration and your raspberry model. I always had problems with Killer Instinct since I'm not able to find a good file for that game. But for the others, I had no problem at all. Concerning the MAME incident, as @herb_fargus stated, the problem should reside on the romset you have. MAME has many different versions and a single game could work fine in one oh those versions but could not work in other. I don't remember but I guess most of the working games are in the romset 1.38 You can check it.

@quicksilver Glad I didn’t make a fool of myself. I remember the “olden” days where you had 2 working emulators for n64 and neither gave you everything you wanted.

@baviaannl __Mupen64Plus __ is a standalone emulator, so it's not getting its settings from RetroArch, you can try lr-mupen64plus (which is a Libretro emulator) and see if it works. For standalone emulators, just like for libretro emulators, ES will try and generate an input configuration file when you register your input. If you modified it in-game, then you can edit/reset it as described in https://retropie.org.uk/docs/Nintendo-64/

@spartan2381 choose emulator mupen64plus-GLideN64-highresolution

@mitu i was looking to play around with it and to make some thing that will run old arcade games -ps 1possibly ps2 , dream cast, game cube, and Xbox games. to give to my cusin as a gift for his doctorate graduation in 1- 2 years when he is done and i would not mind a copy for my self and i dont want to have to build something too big for him that is going to cost me a arm and leg.

Sorry to waste your time. Found the solution. sudo chown -R pi:pi /opt/retropie/configs

Thanks for that, I've tried the standalone and they work fine with no tinkering. I'm trying the high resolution one as default but it looks like I'll probably need to set alternatives for some roms, as they're a bit sluggish. Mario Kart 64 looks and plays really well though!

@jonnykesh unzipped .nds work fine too. I have all of mine unzipped