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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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.
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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Amazing knowledge :)
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