Start small. Scan your NES folder first. Then add SNES. Then arcade. Before you know it, you will be staring at a playlist of 9,000 games—and the hardest choice will be choosing which one to play first.
This article breaks down everything you need to know: what the 9000 ROM set is, how to use it with RetroArch, legal considerations, and step-by-step setup for the ultimate vintage gaming rig. RetroArch 9000 ROMs