$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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