     $D9E3/55779:   Open file for writing

    Jump from $D8D6, $D8DE:

    D9E3: A5 E2     LDA $E2         ; drive number
    D9E5: 29 01     AND #$01
    D9E7: 85 7F     STA $7F
    D9E9: 20 DA DC  JSR $DCDA
    D9EC: 20 E4 D6  JSR $D6E4

    Jump from $D93D, $D998:

    D9EF: A5 83     LDA $83         ; channel number
    D9F1: C9 02     CMP #$02
    D9F3: B0 11     BCS $DA06
    D9F5: 20 3E DE  JSR $DE3E
    D9F8: A5 80     LDA $80
    D9FA: 85 7E     STA $7E
    D9FC: A5 7F     LDA $7F
    D9FE: 8D 6E 02  STA $026E
    DA01: A5 81     LDA $81
    DA03: 8D 6F 02  STA $026F

    Jump from $D9F3:

    DA06: 4C 99 C1  JMP $C199

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