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Many classic arcade games (like Donkey Kong or Pole Position ) used analog sound circuits that cannot be emulated via ROM dumps. MAME requires external .wav files (samples). The set has baked those samples directly into the ROM structure. If you have the exclusive set, you never need to download a separate "samples" folder again.
ecosystem, v1.0.0.0 brought stable support for modern emulation features like retroachievements (to reduce input lag), and netplay. Performance