> My sets are fully-merged, and each rom is renamed to its CRC. This allows one
> set to work with many versions of mame, and many emulators.

This is a weird way and obsolete. Simply get update dats or use a profile for each mame version.



> The problem is, I don't know how to drive CMP to give me the result I need. How
> do I ask CMP for the list of missings, and how do I turn that list into a dat
> file?

Well...you can try to run a full scan (with name check enabled). It will list each and any file as wrong-named since you renamed them.
After the scan toggle the name checkbox and it will hide the wrong named entries, so you end with the ones you really miss. Then use the popup menu option to save a fixdat.


To be honest....you should change the way of storing your files. There are diff-datfiles out there which includes the changes from MAME version to MAME version. In my opinion there is no need to store old MAME versions anyway.


Roman Scherzer