Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: rbowman Newsgroups: comp.os.linux.misc Subject: Re: Blast From Past - IBM 670 Mag Drum Computer Date: 6 Jul 2025 03:38:53 GMT Lines: 13 Message-ID: References: <104cfh8$1p2q2$3@dont-email.me> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: individual.net Mgmu8Vl+cAbRiH1YsTSGoQtIZHuFT5Z/hnIkdN885efpsmQWBR Cancel-Lock: sha1:lYu3JifRVZOeVrNGm5KsgvZXDD0= sha256:cr/NBl7zz7Wj//A91iEV1IjajKryYE4gz3WZ0bEKNVI= User-Agent: Pan/0.160 (Toresk; ) Xref: csiph.com comp.os.linux.misc:69409 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.