     $D676/54902:   Move head by half a track

    Jump from $D610, $D628:

    D676: C9 00     CMP #$00
    D678: F0 18     BEQ $D692
    D67A: 30 0C     BMI $D688

    Jump from $D684:

    D67C: A0 01     LDY #$01
    D67E: 20 93 D6  JSR $D693       ; transmit data for head position
    D681: 38        SEC
    D682: E9 01     SBC #$01
    D684: D0 F6     BNE $D67C
    D686: F0 0A     BEQ $D692

    Jump from $D67A, $D690:

    D688: A0 FF     LDY #$FF
    D68A: 20 93 D6  JSR $D693       ; transmit data for head position
    D68D: 18        CLC
    D68E: 69 01     ADC #$01
    D690: D0 F6     BNE $D688

    Jump from $D678, $D686:

    D692: 60        RTS

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