Routines
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F565: Decrement D With Wrap
Used by the routines at F490 and ProcessLocationUpdate.
DecrementDWithWrap F565 DEC D
F566 BIT 7,D
F568 RET NZ
F569 INC D
F56A LD H,A
F56B XOR A
F56C LD A,H
F56D RET
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