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Groups > comp.lang.c > #64729

Re: Linked lists, message passing

From glen herrmannsfeldt <gah@ugcs.caltech.edu>
Newsgroups comp.lang.c
Subject Re: Linked lists, message passing
Date 2015-07-06 01:05 +0000
Organization Aioe.org NNTP Server
Message-ID <mnck8b$pof$1@speranza.aioe.org> (permalink)
References (9 earlier) <mn89b4$kpb$1@speranza.aioe.org> <mn8as6$bgj$1@dont-email.me> <7o9gpa1isoir1he951j76jdc9185ohgejl@4ax.com> <mnbn5n$pgs$1@speranza.aioe.org> <bouipa58uspl6encmho5rg7ajnh1jvemq8@4ax.com>

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Geoff <geoff@invalid.invalid> wrote:

(snip)
> Yes, it was a fun project. 20+ years was more than I expected from a
> wire-wrap layout but I am told the life expectancy of properly done
> wirewrap connections is very long. IIRC, the clock was 4MHz on the Z80
> CPU. I drew the schematic on 1/4 inch ruled paper with a template and
> pencil, there being no such thing as schematic capture at the time. It
> was a DTMF controlled remote base and handled 4 radios.


I have been working with an IBM 2020 processor, built in 1967.
The backplane is PC board plus wirewrap, where easier lines go on
the PC board, and others that are too hard to route (in 1967 PC
routing technology) are wirewrap, I believe by machine. Likely many
more wrap connection points than yours, and still runs fine. 

Properly done, wirewrap is supposed to cold weld the contact points,
though hand wrapped might not be quite that good. 

The schematics for the 2020 are machine drawn and printed on
IBM line printers. Kind of ugly, but they do work.

-- glen

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Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-06-19 05:49 +0200
  Re: Linked lists, message passing Ike Naar <ike@iceland.freeshell.org> - 2015-06-19 06:51 +0000
    Re: Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-06-19 09:08 +0200
      Re: Linked lists, message passing Barry Schwarz <schwarzb@dqel.com> - 2015-06-19 02:08 -0700
        Re: Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-06-19 14:11 +0200
          Re: Linked lists, message passing raltbos@xs4all.nl (Richard Bos) - 2015-06-19 13:47 +0000
            Re: Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-06-19 15:52 +0200
              Re: Linked lists, message passing Robert Wessel <robertwessel2@yahoo.com> - 2015-06-19 22:07 -0500
              Re: Linked lists, message passing raltbos@xs4all.nl (Richard Bos) - 2015-06-27 12:25 +0000
                Re: Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-06-29 09:03 +0200
                Re: Linked lists, message passing raltbos@xs4all.nl (Richard Bos) - 2015-07-03 17:28 +0000
                Re: Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-07-03 22:16 +0200
                Re: Linked lists, message passing Morris Dovey <mrdovey@iedu.com> - 2015-07-03 16:44 -0500
                Re: Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-07-04 01:12 +0200
                Re: Linked lists, message passing Morris Dovey <mrdovey@iedu.com> - 2015-07-03 18:50 -0500
                Re: Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-07-04 09:39 +0200
                Re: Linked lists, message passing Morris Dovey <mrdovey@iedu.com> - 2015-07-04 04:34 -0500
                Re: Linked lists, message passing Bartc <bc@freeuk.com> - 2015-07-04 11:01 +0100
                Re: Linked lists, message passing Geoff <geoff@invalid.invalid> - 2015-07-04 11:43 -0700
                Re: Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-07-05 18:49 +0200
                Re: Linked lists, message passing Geoff <geoff@invalid.invalid> - 2015-07-05 12:30 -0700
                Re: Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-07-05 22:39 +0200
                Re: Linked lists, message passing Geoff <geoff@invalid.invalid> - 2015-07-05 15:08 -0700
                Re: Linked lists, message passing glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-07-06 01:05 +0000
                Re: Linked lists, message passing Geoff <geoff@invalid.invalid> - 2015-07-05 23:55 -0700
                Re: Linked lists, message passing "Chris M. Thomasson" <nospam@nospam.nospam> - 2015-07-04 11:48 -0700
                Re: Linked lists, message passing Morris Dovey <mrdovey@iedu.com> - 2015-07-03 18:51 -0500
                Re: Linked lists, message passing G G <gdotone@gmail.com> - 2015-07-03 18:13 -0700
  Re: Linked lists, message passing Richard Heathfield <rjh@cpax.org.uk> - 2015-06-19 08:12 +0100
    Re: Linked lists, message passing "Morten W. Petersen" <morphex@gmail.com> - 2015-06-19 09:30 +0200
      Re: Linked lists, message passing Richard Heathfield <rjh@cpax.org.uk> - 2015-06-19 08:59 +0100
        Re: Linked lists, message passing Noob <root@127.0.0.1> - 2015-06-19 10:14 +0200
          Re: Linked lists, message passing Richard Heathfield <rjh@cpax.org.uk> - 2015-06-19 09:40 +0100
            Re: Linked lists, message passing Ian Collins <ian-news@hotmail.com> - 2015-06-20 15:14 +1200
    Re: Linked lists, message passing jacobnavia <jacob@jacob.remcomp.fr> - 2015-06-19 18:10 +0200
      Re: Linked lists, message passing Richard Heathfield <rjh@cpax.org.uk> - 2015-06-19 17:32 +0100
        Re: Linked lists, message passing Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-29 00:56 -0700
      Re: Linked lists, message passing Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-29 00:49 -0700
    Re: Linked lists, message passing Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-11 08:32 -0700

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