$F556/62806:   Wait for SYNC

F556: A9 D0     LDA #$D0
F558: 8D 05 18  STA $1805
F55B: A9 03     LDA #$03
F55D: 2C 05 18  BIT $1805
F560: 10 F1     BPL $F553
F562: 2C 00 1C  BIT $1C00
F565: 30 F6     BMI $F55D
F567: AD 01 1C  LDA $1C01
F56A: B8        CLV
F56B: A0 00     LDY #$00
F56D: 60        RTS

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