This guide will walk you through everything you need to know: which RetroArch cores to use, where to place your BIOS, how to source the correct ROM sets (clones vs. parents), and how to optimize the experience for modern screens.
The most compatible and actively maintained core for Neo Geo in RetroArch is: neo geo roms for retroarch
Take your valid neogeo.zip file and copy it into the folder you just located. This guide will walk you through everything you