RIP Optane/XPoint

By: David Hess (, August 2, 2022 10:26 pm
Room: Moderated Discussions
David Hess ( on August 2, 2022 10:24 pm wrote:
> Doug S ( on July 30, 2022 10:43 pm wrote:
> > David Hess ( on July 30, 2022 3:44 pm wrote:
> > > David Hess ( on July 29, 2022 8:59 pm wrote:
> > >
> > > Last night I remembered another computer system which could start up exactly where it
> > > left off after power loss; this was a feature of some systems which used core memory.
> > > It was a small step from relying on core memory for program and data storage, to including
> > > circuits to safely shut down and restart after power loss by saving CPU state.
> > >
> > > This could also have been done with a microprocessor and CMOS SRAM or even DRAM, but
> > > I do not remember any systems which did it that way. Someone must have though.
> >
> > This is before my time but in the core memory days booting was kind of a pain
> > in the ass, was it not? Even if you had the luxury of a hard drive you probably
> > had to either toggle in a bootloader or load it via paper tape.
> >
> > That was probably the main reason that was used, not necessarily because they wanted to pick up where
> > they left off - but if the PC, SP and registers were themselves stored in a type of core memory (or
> > there was a big capacitor or something allowing a split second for them to be saved to core memory)
> > then I guess theoretically it could simply pick up where it left off once power returns.
> Core memory was contemporaneous with SRAM, DRAM, ROM, PROM, UVEPROM, and floppy disk storage.
> The oldest systems I worked on booted a monitor from UVEPROM which then booted from floppy
> disk, but embedded systems ran directly from UVEPROM. It was the mini-computers which commonly
> had core memory but they also booted from floppy disk or UVEPROM. Any combination was possible
> in an embedded system. Toggling in a bootloader was optional by then.
> Low power CMOS SRAM suitable for battery backup did not exist yet though. It was sometimes
> done anyway with huge batteries to give only hours to days of backup time. One of my digitizing oscilloscopes was setup that way.
> For an embedded system running from ROM and/or core memory, there was plenty of time after detecting
> loss of power to save the processor state, which is still the case today for many embedded systems.
> Back then it might be no more complicated than subroutine entry and exit.

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TopicPosted ByDate
RIP Optane/XPointWes Felter2022/07/28 07:53 PM
  RIP Optane/XPointRayla2022/07/28 08:28 PM
  RIP Optane/XPointDoug S2022/07/28 09:00 PM
    RIP Optane/XPointNoSpammer2022/07/29 01:50 AM
    NVDIMM-NEric L2022/07/29 03:36 AM
    RIP Optane/XPointMichael S2022/07/29 04:02 AM
      RIP Optane/XPointDoug S2022/07/29 10:40 AM
        RIP Optane/XPointDoug S2022/07/29 10:43 AM
          RIP Optane/XPointLinus Torvalds2022/07/29 11:20 AM
            RIP Optane/XPointDavid Hess2022/07/29 08:59 PM
              RIP Optane/XPointDavid Hess2022/07/30 03:44 PM
                RIP Optane/XPointDoug S2022/07/30 10:43 PM
                  RIP Optane/XPointrwessel2022/07/31 05:33 AM
                  RIP Optane/XPointKonrad Schwarz2022/08/02 08:06 AM
                  RIP Optane/XPointDavid Hess2022/08/02 10:24 PM
                    RIP Optane/XPointDavid Hess2022/08/02 10:26 PM
                    RIP Optane/XPointAdrian2022/08/03 01:19 AM
        RIP Optane/XPointanonymou52022/07/29 12:50 PM
    RIP Optane/XPointGionatan Danti2022/07/29 09:09 AM
    RIP Optane/XPointMark Roulo2022/07/29 10:02 AM
      RIP Optane/XPointdmcq2022/07/30 03:42 AM
      RIP Optane/XPointanon32022/07/31 10:19 PM
        RIP Optane/XPointanon22022/07/31 10:55 PM
          RIP Optane/XPointDoug S2022/08/01 08:37 AM
            RIP Optane/XPointGionatan Danti2022/08/01 01:33 PM
              RIP Optane/XPointNoSpammer2022/08/02 03:50 AM
                RIP Optane/XPointDoug S2022/08/02 09:24 AM
                  RIP Optane/XPointGionatan Danti2022/08/02 10:34 AM
                  RIP Optane/XPoint---2022/08/02 10:39 AM
            RIP Optane/XPointDavid Hess2022/08/03 03:48 AM
              RIP Optane/XPointMichael S2022/08/03 06:04 AM
                RIP Optane/XPointDavid Hess2022/08/03 08:56 AM
        RIP Optane/XPointAdrian2022/08/01 02:15 AM
          RIP Optane/XPointGionatan Danti2022/08/01 06:07 AM
            Losses vs not profitable enoughMark Roulo2022/08/01 10:15 AM
              Losses vs not profitable enoughdmcq2022/08/01 11:50 AM
                Losses vs not profitable enoughGionatan Danti2022/08/01 12:34 PM
            RIP Optane/XPointMichael S2022/08/01 02:47 PM
              RIP Optane/XPointAnon2022/08/01 03:09 PM
                RIP Optane/XPointMichael S2022/08/01 03:32 PM
      RIP Optane/XPointGroo2022/08/01 12:28 PM
        RIP Optane/XPointanon32022/08/01 10:33 PM
          RIP Optane/XPointGroo2022/08/03 11:15 AM
            RIP Optane/XPoint---2022/08/03 03:05 PM
    LatencyDavid Kanter2022/07/29 06:35 PM
  Operating system and driver overheadEric L2022/07/29 03:44 AM
    Operating system and driver overheadLinus Torvalds2022/07/29 10:45 AM
  altrernatives?Michael S2022/07/29 05:17 AM
    altrernatives?Rayla2022/07/29 06:49 AM
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