I’m having the same issue when loading .dsk files. The standard green screen comes up and throws an SN error. No .dsk files will load. No issues with .cas files though. Today I installed the emulator from the latest source, dropped the bas13.rom in the BIOS folder, and dropped .dsk files in the coco folder under roms. Retropie version 4.5.1 installed.

@steve-bamford Not a problem. xroar is a "niche" emulator at best. We gotta stick together. Enjoy. Get yourself a full game ROM set and go crazy!

@xdrak Sometimes you can't see for looking! It's a pretty obscure emulator, not sure a lot of people on here use it. I use it for DRAGON32.

@groviar you should test it out. Generally Rom loading is far more straight forward on retropie than windows emulators.