Because MAME requires exact file signatures (CRC), simply adding a translation patch to a standard ROM might prevent it from loading unless the emulated system's database supports that specific modified version.
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Distributing or downloading copyrighted ROMs is generally illegal unless you own the original arcade board. Always use a reliable ad-blocker when visiting third-party ROM sites to avoid malware. of MAME or finding the exact BIOS files needed for Spanish arcade titles? How does MAME look for files? Because MAME requires exact file signatures (CRC), simply