Not quite. OS/VS1 and OS./VS2 R1 are single address space; OS/VS2 and later are multiple address spaces. MVS/SP V1.2 and later also exploit DAS.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Mike Schwab <mike.a.sch...@gmail.com> Sent: Tuesday, September 1, 2020 10:56 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Architectural Level Sets Well, this is what confused me. OS/VS1 1.7 was released to run on the IBM 4300. VS2 is multiple address spaces, vs VS1 is a single 16MB address space, correct? https://secure-web.cisco.com/1njGXa3IXfe6_pxDexMLHLT8MNwLffzHfGFbI3HijfLXYvJjY3rEJ_L7FzaBcQEkSIQfDEt-Jj5KdwRTXRm8cc36fiVnqO5imtvcs2iWn2TjgFOn15E8Z_fP321PeIrhoPSPR8uR6o_sd1SLGRdR3bqzerHHzy1WRj6dBK42dvUIP4Wp5Sab6kjMS6ptkMc7OxTY3ij7QBbQd129osILmw7D0kx-xJrMVuJDKexf4oZmHPnQGGDQOaA3Ck5Ok6bZEhKlShEb5HX34gy05TtqVpf64yN2PndaAH9isXwZtVn1CSJT5Ew-XS-8JpriBidlNjOMBBg5gvCUsaVE75SfjjRnca_EkRZNEplmb6KOIGFo76XK7IzFce_jElgnptP0jvjlvstcpgOT8ufgzT3U1gxhjzes-goeFd5B6N48AyqDsK6y8Kxt8cvWKdmkfAjZM/https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FIBM_4300#Operating_systems On Tue, Sep 1, 2020 at 6:27 PM Phil Smith III <li...@akphs.com> wrote: > > mike.a.sch...@gmail.com (Mike Schwab) 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. > > > > What does this mean, "a single virtual address space"? VM ran fine on it, > with many virtual address spaces. Are you perhaps thinking of V=R/V=F? I > disremember whether 43xx supported those. > > > > ...phsiii > > > > P.S. "zSeries" (RIP) > > > ---------------------------------------------------------------------- > 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
