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From: William Cheswick <ches@cheswick.com>
Cc: The Eunuchs Hysterical Society <tuhs@tuhs.org>
Subject: Re: [TUHS] A/UX [was Linux is on-topic]
Date: Sat, 15 Aug 2020 12:55:17 -0400	[thread overview]
Message-ID: <4C96E13E-353F-4828-B408-758EAF2E270B@cheswick.com> (raw)
In-Reply-To: <176D143B-8C1A-4CAB-94E9-5433DBE7E4A6@humeweb.com>

The wire lengths were important in CDC CPUs. I once saw an expert from CDC poking through the rats nest of wires on the backplane, yanking the wires around with his flashlight, and pulled one out thinking it was the wrong length.  It was.

Message by ches. Tappos by iPad.


> On Aug 14, 2020, at 11:08 PM, Andrew Hume <andrew@humeweb.com> wrote:
> 
> not on the cyber 72 we shared, dave.
> it was, in fact, a length of wire.
> the 72 had one length, and the 76 had a shorter length.
> (i guess you could call that a sort-of timing capacitor?)
> 
> i watched a cyber technician change the wires for the
> purposes of doing a verification test.
> 
>> On Aug 14, 2020, at 7:02 PM, Dave Horsfall <dave@horsfall.org> wrote:
>> 
>>> On Fri, 14 Aug 2020, Rich wrote:
>>> 
>>> On a vaguely related note, I found it amusing that there was a well known hack for Cray's (or perhaps 6600's) which were misbehaving: put a Tektronix scope probe on a test point that generally had one there during final system checkout. The load (extremely mnimal by design) was just enough to stabilize the system.
>> 
>> There was also the story about the major difference between a Cyber 72 and a Cyber 73 was just a timing capacitor...  Very expensive capacitor :-)
>> 
>> -- Dave

  reply	other threads:[~2020-08-15 16:57 UTC|newest]

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-17 18:08 [TUHS] H.J. Lu Bootable Root & Base System disks Norman Wilson
2020-07-17 18:14 ` John Cowan
2020-07-17 18:19 ` Larry McVoy
2020-07-17 19:53 ` [TUHS] Linux is on-topic Warren Toomey
2020-07-17 19:57   ` Larry McVoy
2020-07-17 20:00     ` Adam Thornton
2020-07-17 20:04       ` Larry McVoy
2020-07-17 20:03     ` Dan Cross
2020-07-17 23:31       ` A. P. Garcia
2020-07-19 10:26       ` emanuel stiebler
2020-07-17 20:07     ` Warren Toomey
2020-07-17 20:12       ` Warner Losh
2020-07-17 20:19       ` Clem Cole
2020-07-19  9:54       ` Sergio Pedraja
2020-07-17 20:08     ` Michael Kjörling
2020-07-17 20:55       ` Grant Taylor via TUHS
2020-07-17 21:28         ` Michael Kjörling
2020-07-18 20:22           ` Ed Carp
2020-07-18 20:29             ` Warner Losh
2020-07-19  2:31               ` Gregg Levine
2020-07-19  3:46               ` Wesley Parish
2020-07-19  4:42                 ` Grant Taylor via TUHS
2020-07-19 18:01                   ` Michael Parson
2020-07-20  8:47                     ` [TUHS] A/UX [was Linux is on-topic] arnold
2020-07-20  9:46                       ` Arno Griffioen
2020-07-20 16:35                         ` Arthur Krewat
2020-07-20 17:44                           ` Arno Griffioen
2020-07-20 19:07                         ` Rich Morin
2020-07-20 19:45                           ` Al Kossow
2020-07-20 19:49                             ` Al Kossow
2020-07-24  0:01                               ` Chris Hanson
2020-07-20 20:20                         ` Ed Carp
2020-07-20 21:02                           ` John Cowan
2020-07-20 22:27                             ` Ed Carp
2020-07-24  0:04                             ` Chris Hanson
2020-07-31 23:02                             ` Dave Horsfall
2020-07-31 23:12                               ` Richard Salz
2020-08-01  1:36                                 ` Larry McVoy
2020-08-01 16:08                                   ` Nemo Nusquam
2020-08-01 17:01                                     ` Arthur Krewat
2020-08-13  0:00                                   ` Dave Horsfall
2020-08-13  1:47                                     ` Larry McVoy
2020-08-13  3:15                                       ` Grant Taylor via TUHS
2020-08-13  4:02                                         ` Larry Cashdollar via TUHS
2020-08-31 21:12                                         ` Dave Horsfall
2020-09-03 14:10                                           ` Michael Parson
2020-08-13  1:53                                     ` Nemo Nusquam
2020-08-13 17:14                                   ` Dan Cross
2020-08-13 17:19                                     ` Henry Bent
2020-08-13 17:58                                       ` Warner Losh
2020-08-13 20:04                                       ` John Cowan
2020-08-13 20:52                                         ` Dan Cross
2020-08-14 17:31                                         ` Paul Winalski
2020-08-15  1:24                                           ` Dave Horsfall
2020-08-18 13:57                                         ` Derek Fawcus
2020-08-18 14:11                                           ` John Cowan
2020-08-31 21:20                                         ` Dave Horsfall
2020-08-13 19:18                                     ` Adam Thornton
2020-08-13 19:28                                       ` Warner Losh
2020-08-13 20:15                                         ` [TUHS] AIX link repost [was " Charles H Sauer
2020-08-13 20:09                                       ` [TUHS] " Rich
2020-08-13 20:16                                         ` Larry McVoy
2020-08-13 20:17                                         ` Dr Iain Maoileoin
2020-08-14  1:04                                         ` Christopher Browne
2020-08-14 17:18                                           ` Jim Capp
2020-08-14 17:37                                             ` Jim Capp
2020-08-14 17:39                                             ` Jon Steinhart
2020-08-15  0:33                                               ` Rich
2020-08-15  1:20                                                 ` Larry McVoy
2020-08-15  2:08                                                   ` Dave Horsfall
2020-08-15  2:47                                                     ` Warner Losh
2020-08-15 17:44                                                     ` Paul Winalski
2020-08-15 12:05                                                   ` Thomas Paulsen
2020-08-15  1:33                                                 ` Jon Steinhart
2020-08-15  2:02                                                 ` Dave Horsfall
2020-08-15  2:45                                                   ` Andrew Hume
2020-08-15 16:55                                                     ` William Cheswick [this message]
2020-08-15  3:29                                                   ` Larry McVoy
2020-08-15  1:40                                             ` Gregg Levine
2020-08-13 22:24                                     ` Grant Taylor via TUHS
2020-07-24  0:02                           ` Chris Hanson
2020-07-20  9:48                       ` Andrew Warkentin
2020-07-20 11:49                         ` Larry McVoy
2020-07-20 14:36                           ` Clem Cole
2020-07-20 17:24                           ` John Cowan
2020-07-20 22:11                           ` Ed Carp
2020-07-21  1:04                             ` Larry McVoy
2020-07-22  3:13                               ` tytso
2020-07-22  5:40                                 ` Bakul Shah
2020-07-22 14:16                                   ` Larry McVoy
2020-07-20 12:32                       ` Derrik Walker v2.0
2020-07-20 12:54                         ` Andrew Warkentin
2020-07-21  1:50                           ` Larry McVoy
2020-07-21  2:30                             ` Gregg Levine
2020-07-22  3:44                         ` Jason
2020-07-22 12:23                           ` Derrik Walker v2.0
2020-07-20 14:28                       ` Clem Cole
2020-07-22  3:50                         ` Jason
2020-07-22  4:26                           ` Henry Bent
2020-07-24  0:10                             ` Chris Hanson
2020-07-20  0:24               ` [TUHS] Linux is on-topic Ed Carp
2020-07-22  3:41             ` Jason
2020-07-22 16:15               ` Michael Parson
2020-07-18  3:34     ` Tomasz Rola
2020-07-18 16:45     ` Christopher Browne
2020-07-19  7:32       ` Lars Brinkhoff

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