Re: Blast From Past - IBM 670 Mag Drum Computer

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From	rbowman <bowman@montana.com>
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Subject	Re: Blast From Past - IBM 670 Mag Drum Computer
Date	6 Jul 2025 03:38:53 GMT
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On Sun, 6 Jul 2025 00:20:56 -0000 (UTC), Lawrence D'Oliveiro wrote:

> The “big” computers were noticeably more vulnerable than little micros
> in one respect: sensitivity to power fluctuations. The least little
> brownout and our VAX machines would be down for about the 15 minutes it
> took to recheck and remount their filesystems and go through the rest of
> the boot process. Whereas the little machines on our desks wouldn’t even
> notice a thing.

We noticed an odd thing. Some, but not all, of the desktops had UPSs. 
During the occasional 'oh shit' flicker the machines without a UPS or 
those with a good UPS didn't have a problem. Those with a bad UPS went 
down hard.

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Thread

Blast From Past - IBM 670 Mag Drum Computer c186282 <c186282@nnada.net> - 2025-07-02 23:30 -0400
  Re: Blast From Past - IBM 670 Mag Drum Computer Allodoxaphobia <trepidation@example.net> - 2025-07-03 12:03 +0000
    Re: Blast From Past - IBM 670 Mag Drum Computer rbowman <bowman@montana.com> - 2025-07-03 18:43 +0000
      Re: Blast From Past - IBM 670 Mag Drum Computer c186282 <c186282@nnada.net> - 2025-07-05 02:14 -0400
        Re: Blast From Past - IBM 670 Mag Drum Computer Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-07-05 13:30 +0000
          Re: Blast From Past - IBM 670 Mag Drum Computer rbowman <bowman@montana.com> - 2025-07-05 18:05 +0000
          Re: Blast From Past - IBM 670 Mag Drum Computer Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-07-05 13:25 -0700
          Re: Blast From Past - IBM 670 Mag Drum Computer Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-07-06 00:20 +0000
            Re: Blast From Past - IBM 670 Mag Drum Computer rbowman <bowman@montana.com> - 2025-07-06 03:38 +0000
          Re: Blast From Past - IBM 670 Mag Drum Computer John Ames <commodorejohn@gmail.com> - 2025-07-07 09:09 -0700
            Re: Blast From Past - IBM 670 Mag Drum Computer c186282 <c186282@nnada.net> - 2025-07-07 17:52 -0400
              Re: Blast From Past - IBM 670 Mag Drum Computer rbowman <bowman@montana.com> - 2025-07-08 03:30 +0000
                Re: Blast From Past - IBM 670 Mag Drum Computer c186282 <c186282@nnada.net> - 2025-07-08 01:55 -0400
                Re: Blast From Past - IBM 670 Mag Drum Computer c186282 <c186282@nnada.net> - 2025-07-08 22:36 -0400

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