Unlike MAME, which prioritizes documenting hardware (even broken games), FBNeo focuses on playability . It requires specific file structures and naming conventions—hence the need for a dedicated "complete romset."
MAME aims for absolute preservation (including glitches), while FBNeo focuses on playability and speed. How to Install and Use Your Romset fbneo complete romset
In emulation, a "romset" is a collection of ROM files (and sometimes CHD files) that match a specific version of an emulator. , sometimes weekly. Every time the emulator updates, the required checksums (hashes) for the ROMs may change. fbneo complete romset