There have been a few recent posts about whether or not N64 games can be played on U.S. systems, so I looked into it and this is what I found.
Nintendo relied on a physical lock out device rather than a chip-based protection, just as they did with the SNES. This means that you can modify either the carts from Japan or your US N64 fairly easily in order to play Japanese carts on your American N64. You can also use pass-through devices that are less cart-savy (like gamesharks etc...).
Pictured below is a modified cart next to a typical US cart. This method is easier to implement and leaves your N64 unmolested (modifying your N64 removes the dust cover slots), but for a collector is less desirable (because you would be hacking up carts).
Niether of these methods are unlawful as you are manipulating property that you own in both cases (you are buying the intellectual property rights in either case).
Oh yeah, and I found all this out when I noticed that all the recent import carts I had picked up had been modifed as pictured above.
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