Point your ROM manager to the split set, set your output format to "Non-Merged," and use the corresponding .dat file for your MAME version to rebuild the collection. Final Verdict
: A non-merged set is the exact opposite of a merged set—it contains absolutely everything a single game needs to run inside its own, self-contained ZIP file. Each game file is a complete, independent archive that includes its base ROMs, unique files, and, in some cases, BIOS data. This makes each ZIP file a fully functional standalone game . non merged mame rom set
If you delete or move the parent zip file, the clone zip file will no longer work. They are strictly dependent on each other. 2. Merged ROM Sets Point your ROM manager to the split set,
| Feature | | Split | Merged | | :--- | :--- | :--- | :--- | | Parent ROM (e.g., sf2.zip) | Contains all files (parent + child + BIOS) | Contains only parent’s unique files | Contains all files for parent + ALL children | | Child/Clone ROM (e.g., sf2ce.zip) | Contains all files needed to run (parent + clone differences + BIOS) | Contains only the difference files (requires parent) | Nothing separate (files are inside parent) | | BIOS files (e.g., neogeo.zip) | Included inside each game’s ZIP | Separate ZIP file required | Separate ZIP file required | | File Size | Largest | Medium | Smallest (for storage) | | Ease of Use | Easiest (no dependencies) | Medium (requires parent/BIOS) | Complex (hard to extract single game) | This makes each ZIP file a fully functional standalone game
For most modern arcade enthusiasts, the is the holy grail. Here is a comprehensive breakdown of what a non-merged set is, how it compares to other formats, and why it might be the perfect choice for your emulation setup. Understanding MAME's Parent-Clone Relationship
To understand different ROM set types, you first need to understand the parent/clone relationship. Arcade games often had multiple versions, like the original Japanese version and a later US release. MAME designates one as the set (usually the most recent, complete version) and all others as clones . Clones contain only the files that differ from the parent, which saves significant storage space . A good analogy is to think of merged sets as a single ZIP file containing an entire family of games, while split and non-merged sets keep each game in its own file.