Non Merged Mame Rom Set !link! ›

mslug.zip contains: NeoGeo BIOS + main program + graphics + sound for Metal Slug only.

If your goal is to have a complete, archival copy of every single MAME game, a non-merged set is a very inefficient way to do it. The wasted space from duplication offers no functional benefit for a collection you never intend to curate. For this purpose, a split set is the standard, recommended format, as it provides a good balance of space savings without the frontend headaches of a merged set.

In split sets, if you delete the parent ROM, none of the clones will work. In non-merged sets, this never happens.

The Ultimate Guide to Non-Merged MAME ROM Sets: Structure, Advantages, and Setup

MAME emulates arcade systems by requiring exact copies of original read-only memory (ROM) chips. As the emulator supports tens of thousands of machines, including parent ROMs (the primary, often original version of a game) and clone ROMs (regional variants, hack fixes, or bootlegs), organizing these files becomes critical. non merged mame rom set

| Use Case | Recommended? | | :--- | :--- | | | ✅ Yes – just download those non-merged ROMs | | You’re setting up a RetroPie / Batocera | ✅ Yes – avoids BIOS/parent lookup issues | | You have plenty of disk space | ✅ Yes – simplest to manage | | You want a complete MAME collection | ❌ No – use split or merged to save space | | You regularly update MAME | ❌ No – split sets are easier to update |

| Feature | Non-Merged | Split | Merged | | :--- | :--- | :--- | :--- | | | Low (most duplication) | Medium | High (least duplication) | | Game Dependency | None (fully independent) | Clones require parent | Clones are inside parent ZIP | | Frontend Visibility | High (all games shown) | Medium (parent must be present) | Low (clones often hidden) | | Ease of Use for Small Collections | Excellent | Poor | Poor | | Recommended Use Case | Small, curated collections; development | Full, archival ROM sets | Not generally recommended |

This is the #1 complaint. A full MAME 0.260 set might be ~35GB compressed. The equivalent Non-Merged set can easily exceed 70-100GB for the same number of games.

In CMP, you can "rebuild" your split set into a non-merged set. For this purpose, a split set is the

The main version of a game (usually the original release, often US or World).

: A clone ROM (e.g., pacman.zip ) includes all the files from its parent ( puckman.zip ) and any required BIOS files.

When a parent ROM changes in a new MAME version, every child in a non-merged set must be updated. In a split/merged set, only the parent changes.

The primary advantage is simplicity. A user can download pacman.zip (non-merged) and run it immediately without tracking down a parent pacman.zip or worrying about missing sound ROMs. The Ultimate Guide to Non-Merged MAME ROM Sets:

Download the standard, full split set for your specific MAME version (e.g., MAME 0.260).

This is the primary, original version of the game (usually the latest parent revision or the original Japanese/US release). It contains the core data and code.

Because of the redundancy, downloading a full Non-Merged set consumes more bandwidth. Updating from version 0.250 to 0.251 requires downloading larger patch files or more changed archives.

: It is ideal for "cherry-picking" only the games you actually want to play. You don't have to worry about accidentally deleting a shared file that might break ten other games.