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D8D4: Update Animation Counter
This routine simply updates *D86F with (*D86F*05)+01.
UpdateAnimationCounter D8D4 LD A,($D86F) A=*D86F.
D8D7 LD B,A B=A.
D8D8 INC B Increment B by one.
D8D9 SLA A Shift A left two positions (with carry).
D8DB SLA A
D8DD ADD A,B A+=B.
D8DE LD ($D86F),A Write A to *D86F.
D8E1 RET Return.
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