IBM-supplied unit attribute table default values

The macro instructions shown in Figure 1 are provided in the module AFHOUTAG. This module is used to set up the IBM-supplied default values for the standard I/O units, and file characteristics such as the DCB information.

Figure 1. IBM-supplied macro instructions

AFHOUTAG AFHOUTCM UNTABLE=99,
               DEVICE=SYSDA

      AFHOUNTM RDRUNIT,DCBSET=DCBRDR
      AFHOUNTM PRTUNIT,DCBSET=DCBPRT
      AFHOUNTM PUNUNIT,DCBSET=DCBPUN

DCBRDR AFHODCBM SFRECFM=F,SFLRECL=80,SFBLKSI=80,
                SURECFM=F,SULRECL=80,SUBLKSI=80

DCBPRT AFHODCBM SFRECFM=UA,SFLRECL=133,SFBLKSI=133

DCBPUN AFHODCBM SFRECFM=F,SFLRECL=80,SFBLKSI=80,
                SURECFM=F,SULRECL=80,SUBLKSI=80

       AFHODCBM SFRECFM=U,SFLRECL=800,SFBLKSI=800,SFMAXRE=100,
                SURECFM=VS,SULRECL=-1,SUBLKSI=800,SUMAXRE=100,
                DMAXRE=100

       AFHOUTCM TYPE=FINAL

Note: The format of this particular example is given for readability purposes. Remember to add the necessary continuation flags in column 72, and to begin continued lines in column 16.

The three AFHOUNTM macro instructions indicate that the standard input unit, the print unit, and the punch unit have the default DCB information provided on the first three AFHODCBM macro instructions. Note that the last AFHODCBM macro does not have a label; its set of defaults apply to all units except the standard I/O units. For more information about the RDRUNIT, ERRUNIT, PRTUNIT, and PUNUNIT runtime options, which are used to specify the unit numbers of these standard I/O units, see z/OS Language Environment Programming Reference.