     $D09B/53403:   ?

    Jump from $D0AF, $DC57:

    D09B: 20 D0 D6  JSR $D6D0       ; parameters to disk controller
    D09E: 20 C3 D0  JSR $D0C3       ; read block
    D0A1: 20 99 D5  JSR $D599       ; ok?
    D0A4: 20 37 D1  JSR $D137       ; get byte from buffer
    D0A7: 85 80     STA $80         ; track
    D0A9: 20 37 D1  JSR $D137       ; next byte from buffer
    D0AC: 85 81     STA $81         ; sector
    D0AE: 60        RTS

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