JCL DD Statement for a Snap Dump
If access method services encounters a condition that requires it to abnormally
end a job, it takes a snap dump of virtual storage. You must write
an AMSDUMP DD statement to get the snap dump; that is,
//AMSDUMP DD SYSOUT=A If you do not supply an AMSDUMP DD statement and access method services encounters a condition requiring the job to abnormally end, it produces only an abbreviated dump.