> If I wanted to create an "add-on" romset for a previous version of MAME, how
> would I go about doing that? For example, I have a complete set of 0.96 ROMS and
> a Rollback set that represents all of the ROMS removed in previous versions. I
> want to create a set of 0.67 ROMS that ONLY represent those that cannot be found
> in the 0.96 set. Using Rebuilder with the 0.96 set and the 0.67 set folders as
> ROM folders and the Rollback set as the "add-in" directory. This only partially
> finishes it. It picks up games like gauntlet, but misses some like 720, Altered
> Beast, and APB. I know i can create a complete set of 0.67 ROMS, but I really
> don't want to duplicate any diskspace usage if I don't have to. Any suggestions?
>



Use logiqx's mamediff program to create a diff-datfile of a current MAME version and an old. It will contain all changed and new roms. A similar way is to save a fixdatfile (scanner->popupmenu->save fixdat) after a full scan (without fixes enabled) of an old mamecollection with a new database.
In either way, use these dats for rebuilding.

Roman Scherzer
ClrMamePro