Hi Folks,
As you probably know by now, z/OS 2.3 has introduced the possibility
of having 8-character TSO userids and 8-character TSO prefixes. These
name fields were previously limited to 7 characters, ever since TSO came
into existence. (I think the reason for the limitation was that the
SYS1.UADS members, representing the definition of TSO userids before
RACF, ACF2, Top Secret etc. had to have a number at the end of them,
i.e. IBMUSER0, IBMUSER1, etc. So the id itself was limited to 7
characters in length.)
Many programs, especially TSO commands, look to find the TSO userid
in the PSCBUSER field (7 characters long) of the PSCB control block
(mapped by macro IKJPSCB). Also, the TSO prefix for your session is
usually found in the UPTPREFX field (also 7 characters) of the UPT
control block (mapped by macro IKJUPT).
General 8-character userid support, in z/OS 2.3 (and presumably
above) is turned on or off by a switch. It was explained to me, that
the support is quite complicated, so the installation has to be able to
decide whether to turn it on, or not. The installation's control is in
PARMLIB member IKJTSOxx, in the LOGON parameter:
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