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Removal of 1-byte console IDs
Support for 1-byte console IDs is being removed from z/OS:
- For z/OS 1.7, macros and system exits no longer support options
associated with 1-byte console IDs and system commands no longer
support their use. However, existing applications that use 1-byte
console IDs continue to function. IBM provided a facility to identify
and track the use of 1-byte console IDs as part of the z/OS V1.4
consoles enhancements. This support was incorporated into z/OS 1.5
and later releases.
- For z/OS 1.8, messages routed to one-byte console IDs are treated
as if the message was routed to an unknown console. These messages
will only be displayed by those consoles configured with UNKNIDS(Y).
Also, fields related to one-byte console fields in z/OS control blocks
are no longer supported; IBM recommends that programs making use of
console services be reassembled to ensure that they no longer reference
any obsolete fields. Independent software vendors should also be
contacted to ensure that their products are ready for z/OS 1.8.
Console ID Tracking Facility
Parmlib member CNIDTRxx and the SETCON TRACKING command are used to
enable tracking. The command D OPDATA,TRACKING displays information
captured by the tracking facility.
IBM supplies an exclusion list for vendors who have not yet
resolved issues related to the use of 1-byte console IDs on the
download page at
http://www.ibm.com/servers/eserver/zseries/zos/downloads/.
System Commands
IBM recommends that console names be used in system commands rather
than console IDs. All consoles should be assigned names.
Earlier changes to console processing
The console restructuring available with z/OS 1.4 and incorporated into
z/OS 1.5 and later releases also introduced some changes. For example,
the R= option of the CONTROL Q command, which allowed backlogged
messages to be rerouted to another console or to hardcopy was removed.
Note that, on earlier releases, messages were not sent to hardcopy if
they had not been displayed to a real console, so some messages could
have been lost without the use of the K Q,R=HC command.
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