| Error | Likely fix | |-------|-------------| | Missing ROM/CHD | ROM set doesn’t match core version | | Missing BIOS | Get neogeo.zip , cps2.zip , etc. | | Wrong region | Set BIOS region in core options |

A “ROM archive” usually means a of all working ROMs for a specific FBNeo version (e.g., FBNeo v1.0.0.2 ). These are not official – they’re assembled by the community.

MAME notoriously uses three different set types: split, merged, and non-merged. A beginner can easily download a 60GB set only to find that Teenage Mutant Ninja Turtles won’t run because they are missing the parent ROM.

To get started, you'll need to:

Solves the common "ROM set is unknown" error that occurs when an emulator is updated but the ROMs are from an older version.

Use “non-merged” ROM sets if you want each ZIP to be self-contained (no dependencies on parent ROMs). Non-merged sets take more disk space but are easier to manage.