4.4. System wait states
The basic summation of a wait state is “the machine is dead, or will not IPL.” You usually experience this condition during the IPL process, and the disabled wait state code indicates the problem. The cause is often as simple as the system not being able to find some data that is crucial to the IPL process on the IPL volume. Wait codes are documented in z/OS MVS Systems Codes, GC28-1780.
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