WTF? DAS requires MVS/SP. That said, MVS/SP ran just fine on a 4341.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Joe Monk <joemon...@gmail.com> Sent: Tuesday, September 1, 2020 5:55 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Architectural Level Sets 370 supported DAS (the code is in MVS3.8J). 43XX running MVS supported DAS also. 4381 could have up to 64M of main storage... Joe On Tue, Sep 1, 2020 at 4:26 PM Mike Schwab <mike.a.sch...@gmail.com> wrote: > Well, XA+ machines only supported 4K pages / 1M segments and not 2K > pages / 64K segments. Then DAS and Access register additions. The > 43xx series only supported a single virtual address space, like > DOS/VSE. 3090s were the only processors to support Vector > instructions, and op codes were re-used in z series. > > On Tue, Sep 1, 2020 at 4:20 PM Tony Thigpen <t...@vse2pdf.com> wrote: > > > > I was thinking more along the lines of things that prevented earlier > > operating systems from even IPLing on newer boxes. Such as z13 is the > > last processor to have ESA/390 mode. I also have it in my head that at > > some point there were changes to the page size and virtual storage > > tables that caused havoc. > > > > Tony Thigpen > > > > Seymour J Metz wrote on 9/1/20 3:30 PM: > > > Typically the new features reqiured by a level set were added over > several generations, and each generation added more than one feature. > > > > > > > > > -- > > > Shmuel (Seymour J.) Metz > > > http://mason.gmu.edu/~smetz3 > > > > > > > > > ________________________________________ > > > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on > behalf of Tony Thigpen <t...@vse2pdf.com> > > > Sent: Tuesday, September 1, 2020 3:25 PM > > > To: IBM-MAIN@LISTSERV.UA.EDU > > > Subject: Architectural Level Sets > > > > > > IBM has had several Architectural Level Set points where there were > > > significant changes to the CPU that prevented earlier operating systems > > > from running on them. > > > > > > What CPU's were involved with each level, and what was the real > > > underlying item changed on the CPU that forced a new level? (Let's keep > > > it limited to z990 and newer.) > > > > > > > > > Tony Thigpen > > > > > > ---------------------------------------------------------------------- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > > ---------------------------------------------------------------------- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > -- > Mike A Schwab, Springfield IL USA > Where do Forest Rangers go to get away from it all? > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
