Trying to invoke the CA 1 ISPF Interface failed with Abend S0C1 in module TMSIOPRI.
I just upgraded dynamically from CA 1 Release 12.6 to Release 14.0.
Abend S0Cx in TMSIOPRI can be caused by mixed maintenance.
Be sure the Release 14.0 CTAPLINK is in the LINKLIST and there is no STEPLIB in the TSO LOGON Procedure referring to a previous Release of CA 1.
The TSO ISRFIND command might be used to check if TMSIOPRI is called from the Release 14.0 CTAPLINK library.