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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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.
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 :)
Kiitos. Käytämme tätä aikajanasi parantamiseen. KumoaKumoa
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Moving from gameplay to just sound, a wide variety of games from Toaplan such as Vimana, Ghox, Teki Paki, and others have all of the music playback and sound effects managed by a read-protected 647180 MCU. Same problem: No code, no sound.
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One of the more horrid copy protection methods to break, done by Peter Wilhelmsen and the late Morten S. Kirkegaard, involved the Dallas DS5002FP secure MCU. As I understand it, it's primarily a combination of an Intel 8051 MCU, and a block of battery-backed encrypted RAM.
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