     $DF93/57235:   Get buffer number

    Jump from $CAB7, $CDEC, $CF6F, $CFF2, $D0CC, $D12F, $D1D3, $D324, $D44D,
              $D4CA, $D4E8, $D4F8, $D6D0, $D75E, $DBC3, $DDAB, $DE2B, $DE3E,
              $DE82, $DE8E, $E07F, $E457, $E4D1, $EC1F, $ECB3, $ECDC, $ED0D,
              $ED32, $ED46, $EEF4:

    DF93: A6 82     LDX $82         ; channel number
    DF95: B5 A7     LDA $A7,X       ; buffer number
    DF97: 10 02     BPL $DF9B
    DF99: B5 AE     LDA $AE,X       ; buffer number from second table

    Jump from $DF97:

    DF9B: 29 BF     AND #$BF        ; erase V bit
    DF9D: 60        RTS

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