XMEMOPT parameter

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Summary

Default value
3 if M204XSVC is linked into the nucleus
Parameter type
System
Where set
On User 0's parameter line
Related products
All
Introduced
Model 204 V6.1 or earlier

Description

The Model 204 cross-memory services options that can be invoked during execution of Model 204

This parameter applies only to z/OS.

The XMEMSVC parameter is used with any of the nonzero settings.

Valid settings of XMEMOPT are:

SettingMeaning
X'80'Activates CRAM-XDM.
X'20'Use SUSPEND / RESUME instead of WAIT / POST for communication between Model 204 real subtasks. This option may reduce operating system overhead slightly.
X'04'Forces initialization of cross-memory environment.
X'03'Invokes both TIMER PC and IOS BRANCH ENTRY.
X'02'Invokes IOS BRANCH ENTRY (recommended for z/OS).
X'01'Invokes TIMER PC
X'00'Disables TIMER PC and IOS BRANCH ENTRY.

Note: VIO is incompatible with IOSBE and EXCPVR.