Jeffrey You might like to inspect X'A3' - the low order bit will on if the machine is in z/Architecture mode.
If you are on any z/Series hardware then you might be able to use STore Facility List instruction, STFL. 'Might' because this is a privileged instruction and it updates the fullword at real address 200 (X'C8') (z/OS does issue this instruction and leaves the data in storage at that address but I do not know if any other operating systems do this). If you are the latest hardware(z9), then there is STore Facility List Extended, STFLE, which can store up to 16k bits and is not privileged. Both of these instructions store 'facility' bits - they are described at the end of Chapter 4 in the latest POP (SA22-7832-04). Hope this helps John > ----- Message from "Jeffrey D. Smith" <[EMAIL PROTECTED]> > on Wed, 26 Jul 2006 15:40:00 +0000 ----- > > Subject: > > OS/390 2.10 architecture level set 1 (and beyond)? > > Greetings, > > Is architecture level set (ALS) 1 required for OS/390 2.10? > > What machine instructions are required for architecture > level set 1, as oppposed to ALS 0? I seem to recall > that Perform Locked Operation (PLO) is ALS 1. What are the > others? > > Is there a set of CVT flags for the ALS, or maybe there > are bits for individual instructions? > > Also, is ALS 2 the 64-bit architecture? > > Is there another ALS for the very recent instructions, > like Load And Test (LT) and Load Logical Immediate (LLILF)? > > thanks in advance ;) > > > Jeffrey D. Smith > Farsight Systems Corporation > 24 BURLINGTON DR > LONGMONT, CO 80501 > 303-774-9381 direct > 303-709-8153 cell > 303-484-6170 fax > > ---------------------------------------------------------------------- ---------------------------------------------------------------------- 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
