To process output jobs that require special chains for printing, you should have specific classes for each different print chain. You can specify the desired chain in your output writer procedure, and when that output writer is started, the chain will be loaded automatically. (Printers used with special chains should be named with esoteric group names as defined at system installation.) See z/OS HCD Planning for information on the eligible device table.

//IEFPROC EXEC PGM=IASXWR00,REGION=20K,PARM='PDEG,IEFSD094'
//IEFRDER DD   UNIT=SYSPR,DSNAME=SYSOUT,FCB=(STD2,ALIGN),            X
//             UCS=P11,DISP=(,KEEP),                                 X
//             DCB=(BLKSIZE=133,LRECL=133,BUFL=133,                  X
//             BUFNO=2,RECFM=FM)

In this example, the UCS DD parameter requests the print chain alias for data sets in the SYSOUT classes D, E, and G.

If the output device is a 3211 or a 3203-5, a UCS or FCB image can be loaded dynamically between the printing of data sets. Therefore, you can specify a mixture of data sets using different images in a single output class for this device. This will probably require mounting trains and changing forms, however, so it might not be desirable.

When the output device is a 1403 or 3800, the UCS image or 3800 attributes are specified at START XWTR time; they cannot be changed until the writer is stopped. Therefore, all data sets within an output class must be printed using the same train.

The FCB image is ignored when the 1403 printer is the output device.

External writer output to an IBM 3800 Printing Subsystem can also make use of the CHARS, COPIES, FLASH, and MODIFY JCL parameters on the DD statement. For information about using these parameters, see 3800 Printing Subsystem Programmer's Guide. The coding rules and defaults are documented in z/OS MVS JCL Reference.