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Unmapped on the physical level, not the MMU level. Fixes booting Game Boy Interface. Previously, Game Boy Interface thought it was running on a Wii because accessing MEM2 didn't raise a PI interrupt, and as a result tried to exit to the Homebrew Channel in a way Dolphin's HLE doesn't recognize. (Dolphin's HLE catches jumps to 0x80001800, but GBI is running without address translation at this point and therefore jumps to 0x00001800 instead.)