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Q: What causes S0C4 in batch?

Answer:
S0C4 is protection exception - addressing unallocated memory. Causes: uninitialized pointer, subscript out of range, incorrect LINKAGE SECTION. Check CEEDUMP for offset. Likely program bug. Use debugger to trace.
s0c4 protection abend
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Q: What is SPIN parameter?

Answer:
SPIN=UNALLOC releases output immediately on step/job end. SPIN=(UNALLOC,step) at step end. Without SPIN, output held until job completes. Allows viewing long job output early. On DD SYSOUT statement.
spin output unalloc