Defaults

If you dynamically unallocate the SYSOUT data set, the default is that the data set is immediately available for processing. If you unallocate the SYSOUT data set at the end of the step, the default is that the data set is available for processing at the end of the job.

If you specify SPIN=UNALLOC, the following defaults apply:

A data set that is closed by the application program is available for processing immediately.
A data set that is closed as part of the end-of-step cleanup, such as for a program abend, is available for processing at the end of the job.
A data set can be spun as the result of an operator command. This is the same processing as SPIN=(UNALLOC,CMNDONLY)

If you specify SPIN=NO the default is that the data set is available for processing at the end of the job