@lamaman1971 Aside from MAME2003+, MAME cores have a very shallow libretro implementation preventing some stuff from working properly, which is why it's recommended to prefer MAME2003+ or FBNeo with the appropriate romsets if the game you are trying to play is supported.

You might be able to force the values you want by directly editing MAME config files, but i wouldn't be able to help with the details, and i don't recommend asking the MAME team for help about this.