The Unix Heritage Society mailing list
 help / color / mirror / Atom feed
From: Clem Cole <clemc@ccc.com>
To: Ronald Natalie <ron@ronnatalie.com>
Cc: The Eunuchs Hysterical Society <tuhs@tuhs.org>
Subject: Re: [TUHS] AT&T 3B1 - Emulation available
Date: Fri, 29 Jan 2021 09:37:19 -0500	[thread overview]
Message-ID: <CAC20D2NfRSgWeMzS7qr=PJ1ubmcNnG-XDokWp=OG=xDrs9A41g@mail.gmail.com> (raw)
In-Reply-To: <em175b176f-e15d-40cc-bca0-23d0804827eb@alien>

[-- Attachment #1: Type: text/plain, Size: 1954 bytes --]

On Fri, Jan 29, 2021 at 9:00 AM Ronald Natalie <ron@ronnatalie.com> wrote:

> Of course, this was in contrast with the 3B20 which you powered off by
> turning a knob and then holding a button down for three seconds.   Yep,
> phone equipment.   Those who ever dealt with things like real Western
> Electric 303 "broadband" modems recognized that behavior.  You commanded
> loopback on them the same way.
>
Ron, pls don't forget the best 3B20 power-up feature, the pull starter in
the middle (power) cabinet.  Seriously there was a cable that pulled out of
the middle power box (that looked like a small engine pull starter) that
used to by-pass the batteries on a true cold boot because if it was not
there the battery power up would surge the incoming load and trip the mains.
 IIRC the off button Ron describes does not completely power it off, it
just shuts it down and you can take out cards safely, but the batteries and
some subsystems are still active. True 'cold' power down is extremely
difficult.   It is designed to stay powered.

As he said -- standard telco gear, 48V supplies, rack of truck batteries,
*etc*.

BTW: In the same vein, I once had a movie we all called the 'burning Alpha'
when the 'telco special packaged' DEC 4300 from DEC CSS went through its
fire testing in NJ.   All equipment that was going to be in a CO or wiring
center has to be tested to see how it burns in a fire (plastic/nylon parts
in a computer rack can be nasty - and there are very tight specs).   As I
understand the spec, all flames have to stay inside the cabinets.

One of the cute parts of the video is a sidebar, which is displaying the
syslog messages during the fire.  There was a desire, but I don't know if
it was ever acted upon, to match the syslog messages to different
activities in the fire.   During the time when it is burning, there is a
timer in the corner so they can note afterward at exactly which time,
different things were incinerated.

[-- Attachment #2: Type: text/html, Size: 3133 bytes --]

  reply	other threads:[~2021-01-29 14:38 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-29 10:49 Arnold Robbins
2021-01-29 13:49 ` Ronald Natalie
2021-01-29 14:37   ` Clem Cole [this message]
2021-01-31  7:57   ` arnold
2021-01-31  8:41     ` Rich Morin
2021-02-03  7:53 ` emanuel stiebler
2021-02-03  7:59   ` arnold
2021-02-03  8:53     ` Ed Bradford
2021-02-03  8:58       ` arnold
2021-02-03 10:13         ` Ed Bradford
2021-02-03 14:58           ` Clem Cole
2021-02-03 15:33             ` Henry Bent
2021-02-03 16:53               ` Clem Cole
2021-02-04  0:41             ` [TUHS] 68k prototypes & microcode John Gilmore
2021-02-04  0:52               ` Al Kossow
2021-02-04  1:10               ` Arthur Krewat
2021-02-04  1:33                 ` Larry McVoy
2021-02-04  1:47                   ` Al Kossow
2021-02-04  1:57                     ` Al Kossow
2021-02-04  7:23                   ` Arno Griffioen
2021-02-04 11:28                     ` Toby Thain
2021-02-04 15:47                   ` Arthur Krewat
2021-02-04 16:03                     ` emanuel stiebler
2021-02-04 21:55                   ` Dave Horsfall
2021-02-04 22:11                     ` Steve Nickolas
2021-02-04 22:39                       ` Adam Thornton
2021-02-04 22:47                         ` Henry Bent
2021-02-05 14:42                           ` Michael Parson
2021-02-04 22:56                       ` Richard Salz
2021-02-04 23:14                         ` Steve Nickolas
2021-02-04  1:35                 ` Clem Cole
2021-02-04  2:18                 ` Dave Horsfall
2021-02-04 15:53                   ` Arthur Krewat
2021-02-05  2:16                     ` Dave Horsfall
2021-02-05  2:53                       ` Larry McVoy
2021-02-04  1:14               ` Clem Cole
2021-02-04  1:20                 ` Clem Cole
2021-02-04 14:56               ` John Cowan
2021-02-03 15:20           ` [TUHS] AT&T 3B1 - Emulation available emanuel stiebler
2021-02-03 16:48         ` Doug McIntyre
2021-02-03 10:46     ` emanuel stiebler
2021-02-03 11:13       ` arnold
2021-02-05 12:44 ` Sergio Pedraja
2021-02-07  7:32   ` arnold
2021-02-17 16:07     ` emanuel stiebler
2021-02-17 22:00 ` Ed Carp
2021-02-17 22:14   ` Larry McVoy
2021-02-18  1:30     ` Ed Carp
2021-02-18  7:59   ` arnold
2021-02-18 18:07     ` Brad Spencer

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAC20D2NfRSgWeMzS7qr=PJ1ubmcNnG-XDokWp=OG=xDrs9A41g@mail.gmail.com' \
    --to=clemc@ccc.com \
    --cc=ron@ronnatalie.com \
    --cc=tuhs@tuhs.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).