175580320           0 of            1 not allocated
 ----------------------
 Buffer 175580320 in IDATAP
          1        order
          1        inc
 **********        blksize
          4        wordsize
  175580040        filler
  175581936        reader
         -1        index
          0        maxindex
          1        VM
          1        VMnreal
          0        VMoffset
  175580424        VMlist
     I         VMlist
     0    0
     I  reads   index    datap
     0    0        -1              0
 filler
      175580040 differences0
 readers
 sequence 175581936
 175580320         buffer
         0         indexf
         1         type
 175581760         reader
         0         indexr
         0         nextseq
123