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AB09: Routine at AB09
AB09 LD A,(IY+$05) If IY+05 is lower than 78 jump to AB16.
AB0C CP $78
AB0E JR NC,$AB16
AB10 LD (IY+$3C),$01 Write 01 to IY+3C.
AB14 JR $AB1A Jump to AB1A.
AB16 LD (IY+$3C),$FF Write FF to IY+3C.
AB1A CALL $B288 Call B288.
AB1D LD A,(IY+$05) If IY+05 is 78 jump to AE5D.
AB20 CP $78
AB22 JP Z,$AE5D
AB25 RET Return.
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