MVS-recognized (AKA "legal") disablement means that you have a CPU lock, a spin lock, or a super bit (bits in PSASUPER). Since no spin locks are programming interfaces, nor is PSASUPER, that basically leaves the CPU lock "for you".
As Jim Mulder correctly posted, if the system releases a spin lock or the CPU lock and sees that the system is not legally disabled, it will enable (i.e., not preserve your previous disablement state): STNSM -- now disabled SETLOCK OBTAIN,TYPE=CPU -- still disabled SETLOCK RELEASE,TYPE=CPU -- now enabled Similar processing occurs if you have an FRR. If you are not legally disabled, RTM will give control to your FRR enabled (it does not matter if the FRR is set before or after you illegally disable). SETFRR ... STNSM -- now disabled blow up -- still disabled FRR entry -- enabled The cases where the system uses STNSM are typically those where it does not mind ending up enabled if something bad/strange happens. Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
