For , it is critical to use a ROM set that exactly matches the emulator version to ensure game compatibility. While the emulator itself does not include any copyrighted material, you can find compatible archives on the Internet Archive . Compatible ROM Sets

: As PC hardware became more powerful, MAME's code became more accurate but also more demanding. David Valdeita (Seleuco) ported the 0.139u1 version specifically for dual-core Android devices because later versions were too heavy for mobile processors at the time.

These sets are often available as large .zip or .7z archives. For MAME4droid, you generally keep the individual game files zipped and place them in the /sdcard/MAME4all/roms folder.

(Archive.org) is a major repository for these specific legacy ROM collections because it hosts historical software that is often hard to find elsewhere.

: Before downloading and using ROMs, make sure you have the right to do so. Some ROMs may be copyrighted, and downloading them without permission may be illegal.