$DFB7/57271:   ?

Jump from $CF21, $CF7E:

DFB7: A6 82     LDX $82         ; channel number
DFB9: B5 A7     LDA $A7,X       ; buffer number
DFBB: 30 02     BMI $DFBF       ; buffer free?
DFBD: B5 AE     LDA $AE,X       ; buffer number from table 2

Jump from $DFBB:

DFBF: C9 FF     CMP #$FF        ; free?
DFC1: 60        RTS

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