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  • There's a third option on the 64: A cartridge that puts the PLA into Ultimax mode (by setting /GAME = 0 and /EXROM = 1) can override whatever is located in 0xe000 - 0xfff, including the interrupt vectors. This is used by freezers, and by cartridges that provide a Kernal replacement. Commented Nov 28, 2020 at 23:36