The folklore was 1 bit per year - in demand terms. It probably still is. Cheers, Martin
Martin Packer Systems Investigator & Performance Troubleshooter, IBM +44-7802-245-584 email: martin_pac...@uk.ibm.com Twitter / Facebook IDs: MartinPacker Blog: https://mainframeperformancetopics.com Mainframe, Performance, Topics Podcast Series (With Marna Walle): https://anchor.fm/marna-walle Youtube channel: https://www.youtube.com/channel/UCu_65HaYgksbF6Q8SQ4oOvA From: Steve Smith <sasd...@gmail.com> To: IBM-MAIN@LISTSERV.UA.EDU Date: 09/12/2020 15:15 Subject: [EXTERNAL] Re: does anyone recall any details about MVS/XA? Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> It should be kept in mind that while 31-bit addressing was a 32X capacity jump over 24-bit, 64-bit addressing has 8 billion times the addressing space of 31-bit. I'm not sure if z/OS actually supports activating the Region 1st DAT table anyway. z/OS may be only a 53-bit OS. So far... sas On Wed, Dec 9, 2020 at 9:55 AM Mike Wawiorko < 0000014ab5cdfb21-dmarc-requ...@listserv.ua.edu> wrote: > I remember an IBM SE presenting XA to us saying 31 bit addressing and 2GB > memory would serve every need. > > Now how long since 64 bit? > > How long before everything fully supports 64 bit though? > > 128 bit next? > > Mike Wawiorko > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
