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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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