Correct me if I’m wrong, but wasn’t region locking on the NES and SNES largely implemented via the shape of the cartridge? Frank Cifaldi and the VGHF just put out that NES history video, and it had some kind of authentication chip that could only be provided by Nintendo, and it was in the NES but not the Famicom. And on Gamecube, I seem to remember you needed an Action Replay to break the region locking, but I never dabbled in it myself.