     $CDF2/52722:   Check buffer number and open channel

    Jump from $CD36, $CD73, $CD9A:

    CDF2: 20 D2 CD  JSR $CDD2       ; check buffer number and open channel

    Jump from $CCF5, $CD03:

    CDF5: A6 D3     LDX $D3         ; channel number
    CDF7: BD 85 02  LDA $0285,X     ; buffer address
    CDFA: 29 01     AND #$01
    CDFC: 85 7F     STA $7F         ; drive number
    CDFE: BD 87 02  LDA $0287,X
    CE01: 85 81     STA $81         ; sector
    CE03: BD 86 02  LDA $0286,X
    CE06: 85 80     STA $80         ; track
    CE08: 20 5F D5  JSR $D55F       ; track and sector ok?
    CE0B: 4C 00 C1  JMP $C100       ; turn LED on

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