     $D0EB/53483:   Open channel for reading

    Jump from $C6E2, $C9C3, $CB45, $CDE7, $D39B, $D90E, $DE3B, $E20F, $E680,
              $E90A:

    D0EB: A5 83     LDA $83         ; secondary address
    D0ED: C9 13     CMP #$13        ; 19
    D0EF: 90 02     BCC $D0F3       ; smaller?
    D0F1: 29 0F     AND #$0F

    Jump from $D0EF:

    D0F3: C9 0F     CMP #$0F
    D0F5: D0 02     BNE $D0F9
    D0F7: A9 10     LDA #$10        ; 16

    Jump from $D0F5:

    D0F9: AA        TAX
    D0FA: 38        SEC
    D0FB: BD 2B 02  LDA $022B,X
    D0FE: 30 06     BMI $D106
    D100: 29 0F     AND #$0F
    D102: 85 82     STA $82
    D104: AA        TAX
    D105: 18        CLC             ; flag for ok

    Jump from $D0FE:

    D106: 60        RTS

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