Trace information about user operations and macros issued to hardware is saved in memory. To help analyze the causes of errors, the trace information can be specified to be output to an ABEND dump if a MAR program terminates abnormally. To output ABEND dumps, specify the DD statement SYSABEND.
If GTF is started with the GTF parameter specified to acquire a USR trace (TRACE=USR), trace information will be acquired as a GTF trace with an event code from X'300' to X'30F'.