For the present, I generally use the ESA/390 PoP as the "rulebook." If it's there then it's safe to use (even if its listed under a feature, as long as it's non-privileged). Any code that I write will likely be in a new release of Product "X" and it's highly unlikely any customer that's paying money for the product will be running hardware older than that vintage. This is somewhat "pre-ALS-1" but it seems to be working okay for me now. After I was burned by ALC/SLB, I could only presume that I never checked the ESA/390 PoP the way I should have.
At 05:26 PM 10/6/2006, Edward Jaffe wrote: >Art Celestini wrote: >[snip] >>Since I write a lot of code for commercial MVS products, I often run across >>circumstances where one of the "newer" instructions would be useful. But, >>since these products are widely used, I need to be certain that the code will >>run on all of the CPUs owned by the customers of those products. > >Art, > >Unless you want to establish some really complex hardware requirements for >your code, there are only four possible states to worry about: > >1) Prior to OS/390 V2R10 >2) Exactly OS/390 V2R10 http://www.ibm.com/servers/s390/os390/plug.html >3) z/OS V1R1 through z/OS V1R5 http://www.ibm.com/servers/s390/os390/plug1.html >4) z/OS V1R6 and higher (base z/Architecture without any of the fancy stuff >added after z900 aka Freeway) > >If you want to use long displacements (added in z990) or any of the fun things >added in System z9 (FLOGR), you'll need to wait for another level set. ================================================== Art Celestini Celestini Development Services Phone: 201-670-1674 Wyckoff, NJ ============= http://celestini.com ============= Mail sent to the "From" address used in this post will be rejected by our server. Please send off- list email to: ibmmain<at-sign>celestini<dot>com. ================================================== ---------------------------------------------------------------------- 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
