The $FAB_STORE macro moves user-specified values into fields of
    the specified FAB. The expanded $FAB_STORE code executes at run
    time on a previously initialized (allocated) FAB, in contrast to
    the $FAB macro, which initializes the FAB at assembly time. The
    $FAB_STORE macro must reside in a code program section.

    Format

      $FAB_STORE  fab=fab-address,

                  ALQ=#allocation-quantity,

                  BKS=#bucket-size,

                  BLS=#block-size,

                  CHAN_MODE=#channel-access-mode

                  CTX=user-context-value,

                  DEQ=#extension-quantity,

                  DNA=default-filespec-address,

                  DNS=#default-filespec-string-size,

                  FAC=<BIO BRO DEL GET PUT TRN UPD>,

                  FNA=filespec-string-address,

                  FNS=#filespec-string-size,

                  FOP=<CBT CIF CTG DFW DLT MXV NAM NEF NFS OFP POS

                  RCK RWC RWO SCF SPL SQO SUP TEF TMD TMP UFO WCK>,

                  FSZ=#header-size,

                  GBC=#global-buffer-count,

                  LNM_MODE=#logical-name-translation-access-mode,

                  MRN=#maximum-record-number,

                  MRS=#maximum-record-size,

                  NAM=nam-address,

                  ORG={IDX|REL|SEQ},

                  RAT=<BLK{CR|FTN|PRN}>,

                  RFM={FIX|STM|STMCR|STMLF|UDF|VAR|VFC},

                  RTV=#window-size,

                  SHR=<DEL GET MSE NIL PUT UPD UPI NQL>,

                  XAB=xab-address