Well basically the ASCB is always below the 16Mib line, so in 3.1 they decided to create a 31 bit extension block, the ASSB. The ASXB on the other hand, is in the LSQA, not the SQA, so only contains fields that don't need to be accessed from outside of the address space, and is swappable (granted, with all supported versions of z/OS, physical swapping is a thing of the past). Also, I would be remiss if I didn't point out that the ASSBSTKN is NOT part of the programming information. That doesn't mean that it can't be used, just don't be surprised if IBM won't support you if problems occur.
Wayne Driscoll Product Developer NOTE: All opinions are strictly my own. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of (IBM Mainframe Discussion List) Sent: Friday, August 22, 2008 4:35 PM To: [email protected] Subject: Re: Trying to figure out IEAMSCHD In a message dated 8/22/2008 4:22:45 P.M. Central Daylight Time, [EMAIL PROTECTED] writes: >Ok, Bill. Lightbulb time. It's tucked away in the ASSB. ASSBSTKN. The OS creates it when it creates an address space. Glad you found it. I haven't yet learned a good rule of thumb as to why some address space-related fields are in the ASCB, ASSB, or the ASXB. Sometimes I find the control block that has field X in it by doing an ISPF 3.14 with something resembling "X" in the search field and the data set name is first SYS1.MACLIB(*) and then SYS1.MODGEN(*) if necessary. Bill Fairchild Rocket Software **************It's only a deal if it's where you want to go. Find your travel deal here. (http://information.travel.aol.com/deals?ncid=aoltrv00050000000047) ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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
