Prior to z/OS 1.12, z/OS IPL uses Dynamic Address Translation while still in ESA/390 mode. z14 and later machines do not do ESA/390 DAT. So the oldest z/OS that could possibly IPL on a z14 or later machine would be z/OS 1.12. Running under z/VM would make no difference in this regard.
Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp. Poughkeepsie NY "IBM Mainframe Discussion List" <IBM-MAIN@LISTSERV.UA.EDU> wrote on 07/31/2020 02:13:09 AM: > From: "Brian Westerman" <brian_wester...@syzygyinc.com> > To: IBM-MAIN@LISTSERV.UA.EDU > Date: 07/31/2020 10:55 AM > Subject: Re: z/VM guest with old z/OS > Sent by: "IBM Mainframe Discussion List" <IBM-MAIN@LISTSERV.UA.EDU> > > I don't know about z/VM 5.3, but running z/OS 1.10 under z/VM on a > z13 and z14 works (and probably also on a z15), so it's likely that > it will work on a z12. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
