Interesting that the Wikipedia article for "Copy Protection" says literally nothing about the arcade industry, which had some of the most creative (and abusive) anti-copying methods around.
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Among some fairly basic things - display enable/disable, for example - the i8751 MCU controls moving platforms in later stages. No MCU, no moving platforms. This is something only recently fixed in MAME, and which Sega even themselves got wrong in a recent re-release.
Moving along those lines, both Chack'n Pop and Bubble Bobble, from Taito, rely on a Motorola 68-series 8-bit microcontroller for protection. Certain critical aspects of gameplay are handled by it, including when bonus items appear, and enemy AI.
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Patching out the initial protection checks to get the game to boot won't get you very far when the game logic itself is more or less hosed. This is a protection method Taito were very fond of, and would use in later games from the 80's as well.
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Games like Operation Wolf, Rainbow Islands, and others used the "Taito C-Chip", which was a NEC uPD7811 and supporting circuitry, mounted on a substrate, and put in a DIP package to hide it. All of them rely on unique programs for various gameplay-critical elements.
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