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DD03: Cheat: Previous Room
Used by the routine at Handler_Keyboard.
Wraps from room 00 back to 16.
Drop the stacked return and step the room.
Cheat_PreviousRoom DD03 POP BC Restore BC from the stack.
DD04 LD A,($64A2) Jump to Change_Room with the previous room, unless this was room 00.
DD07 DEC A
DD08 CP $FF
DD0A JP NZ,Change_Room
DD0D LD A,$16 Jump to Change_Room with room 16.
DD0F JP Change_Room
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