MAMEWorld Forums - EmuChat - Re: Need help setting up mame 64

The random ROMs you got are probably designed for a version of MAME from the dawn of the millennium, back when people were only dumping the large data ROMs and forgetting or ignoring the smaller chips, or in the case of read-protected ROMs (for example, Taito C-Chips or Gaelco DS5002 chips), couldn't dump them at all until recently.

Unofficial builds of MAME such as iMAME/iMAME4all or the RetroArch "year" cores (all of which were redesigned purely for running on shitty portable hardware like Pi/Android/iOS/retro-console-on-a-chip systems) are keeping these outdated ROM sets circulated when they should have become extinct long ago, which is why there are so many bad ROMs out there.