     $FA05/64005:   Move head to next track

    FA05: A5 4A     LDA $4A
    FA07: 10 05     BPL $FA0E
    FA09: 49 FF     EOR #$FF
    FA0B: 18        CLC
    FA0C: 69 01     ADC #$01

    Jump from $FA07:

    FA0E: C5 64     CMP $64
    FA10: B0 0A     BCS $FA1C
    FA12: A9 3B     LDA #$3B
    FA14: 85 62     STA $62
    FA16: A9 FA     LDA #$FA        ; pointer $62/$63 to $FA3B
    FA18: 85 63     STA $63
    FA1A: D0 12     BNE $FA2E

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