[imablisy] has played a lot of these ROM hack games but always within something like a virtual console or emulator, so he wanted something physical which would work on original hardware of the era.

Save your ROMs in a folder that’s separated into subfolders by console. In RetroArch, navigate to Settings, select Directory, ...

To play a game on a console emulator, you also need a copy of the original game file, which is typically stored in the ROM ...