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56579: Cheat: Previous Room
Used by the routine at Handler_Keyboard.
Wraps from room 0 back to 22.
Drop the stacked return and step the room.
Cheat_PreviousRoom 56579 POP BC Restore BC from the stack.
56580 LD A,(25762) Jump to Change_Room with the previous room, unless this was room 0.
56583 DEC A
56584 CP 255
56586 JP NZ,Change_Room
56589 LD A,22 Jump to Change_Room with room 22.
56591 JP Change_Room
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