: Be wary of "complete" or "all MAME ROMs" packs. These can be large (gigabytes) and may not always be up to date or accurately sourced. They might also include zipped files that, when unpacked, could potentially contain malware.
Since MAME is updated monthly, your ROM pack version must match your MAME emulator version (e.g., MAME 0.264 needs a 0.264 ROM set) [3, 16]. Where to Find Them : Complete "Reference Sets" are most commonly hosted on the Internet Archive all mame roms pack top
"Come on," he whispered. "Give me the heavy stuff." : Be wary of "complete" or "all MAME ROMs" packs