Most ROMs in these sets are . You should legally own the original arcade PCBs to have the right to download ROMs. Distribution of full sets is generally piracy.
The search for a often leads users into the world of "Full Sets" or "Romsets," specifically curated for older hardware or specific mobile emulators like MAME4iOS or MAME4droid. mame v0139 full exclusive arcade set roms easy install
When you see terms like "Full Set" or "Exclusive Set," they refer to specific ways of packaging the ROMs: Most ROMs in these sets are