OTOH, quantum computing (or its successor(s)) may change the paradigm entirely and moot any 64 vs 128 bit issues because qubits are so different from bits.
Peter -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Seymour J Metz Sent: Wednesday, December 9, 2020 11:00 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: does anyone recall any details about MVS/XA? I remember being shocked that IBM believed 24 bits to be enough; it's part and parcel of the short term planning that has come back to haunt us. While I believe that 64-bit addresses will be enough for the foreseeable future, it's not something that I would put any money on. And, yes, if 64 bits starts looking tight, 128 bits is the next logical step, and I would be willing to bet against outgrowing that. -- Shmuel (Seymour J.) Metz https://urldefense.com/v3/__http://mason.gmu.edu/*smetz3__;fg!!Ebr-cpPeAnfNniQ8HSAI-g_K5b7VKg!bxS9Vu_QIUiH-uFCdybG7w1y8d3UBexMEpDcX_6nqyYVMFpNfGb1u3IXre_bTX1MzW5CEg$ ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Mike Wawiorko [0000014ab5cdfb21-dmarc-requ...@listserv.ua.edu] Sent: Wednesday, December 9, 2020 9:54 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: does anyone recall any details about MVS/XA? 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 -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
