$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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