Lastly, I need to ensure that all information is up-to-date as of now (2023), considering that MAME has had several updates since 2003. The user should be aware that newer emulators might not use the 2003 Plus version, but if they specifically need the older sets, they might have to look for older community archives or use the methods mentioned to create them.

I need to be cautious here. Direct links to ROMs are typically against the terms of service of many sites, including GitHub, which might host such files. So instead of providing direct links, I should guide the user on how to obtain or construct the non-merged set themselves. For example, using tools like ClrMame Pro or other MAME-related software to de-merge sets.

First, I need to check if the user is aware that distributing ROMs might involve copyright issues. I should mention that they should only use these ROMs if they own the original games. That's important to stay compliant with legal standards.

For further assistance, engage with communities on or GitHub Discussions , where experienced users often share insights. Note : This article does not endorse or support piracy. Always use ROMs legally.

I should structure the article with sections like Legal Considerations, How to Obtain, Tools and Methods, and Additional Resources. Making sure each section addresses the user's needs while providing actionable information. Also, it's important to emphasize the importance of verifying file integrity through checksums when working with ROMs to ensure authenticity and correct functioning in the emulator.