Routines
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F555: Decrement E With Wrap
Used by the routines at F490 and ProcessLocationUpdate.
DecrementEWithWrap F555 DEC E
F556 LD H,A
F557 LD A,E
F558 CP $FF
F55A LD A,H
F55B RET NZ
F55C INC E
F55D RET
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