CHECK(IBMIOS,IOS_MIDAW) determined that the MIDAW facility is currently in the expected state. The MIDAW facility allows Modified Indirect Addressing Words to be used by the system. The MIDAW facility can improve I/O performance: MIDAW=YES has been specified if enabled, or MIDAW=NO has been specified if disabled.
The expected state of the MIDAW facility can be changed by supplying a check parameter of MIDAW(YES) or MIDAW(NO).
The system continues processing.
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Input/output Supervisor (IOS)
IOSHCCHK
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