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I never saw a piggyback cartridge at the time though, or one that was obviously unlicensed. Of course, this could have more to do with Nintendo's legal pressure than with technological possibility.
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The main pirating route at the time (a device (oh which there were several) that sat under the N64 and had either an Iomega Zip drive or a CD drive for holding ROMs), had a port for inserting a real cartridge to use its lockout chip.
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Yeah, though piracy is not the same as publishing unlicensed original games (bootlegs) like Xibalba 64.
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As far as Nintendo's concerned, it is. Their method of piracy prevention at this point was putting a lockout chip on every cartridge, and attaching their license fee to the lockout chip. Your homebrew cartridge needs one too.
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I think a lot of the early flashcarts were piggybacks. I was never into that scene though.
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