I’m using PocketSnes, Mupen64Plus and PSxRearmed and them work fine! Check the SNES Roms, download the goodsnes…the n64 roms I played fine this games: Super Mario 64, Diddy Kong Racing, Mario Kart 64, Banjo Kazooie, etc…Some games are playable, see the videos on YouTube. PSX games are the bin, iso, img files of cd games, not be ecm files (compressed). Check the power supply, must be 5v and 2a. Is there a rainbow square at up/right screen blinking while you play the games? Good luck.
Raspberry Pi B+ - Mini Bartop Arcade - Retropie 2.6!
Raspberry Pi 2 + PS3 Controller Wireless - Retropie 2.6!
some times you can add an extension like .zip(a compressed format) if you edit it in to /etc/emulationstation/es_systems.cfg you will see stuff after psx in different lines like path, extensions(like .bin, .cue, .iso, .img) and if you get lost looking for psx hold ctrl and W to use “where is” and search psx but i just change the path to my usb stick(media/usb0/psx) so i don’t have to mess with that stuff if you need help let me know