From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id 84a1e49e for ; Fri, 24 Jan 2020 02:00:02 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id BC4ED9C28F; Fri, 24 Jan 2020 12:00:00 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 1B7A99C27E; Fri, 24 Jan 2020 11:59:32 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 5436A9C27E; Fri, 24 Jan 2020 11:59:28 +1000 (AEST) Received: from lb3-smtp-cloud8.xs4all.net (lb3-smtp-cloud8.xs4all.net [194.109.24.29]) by minnie.tuhs.org (Postfix) with ESMTPS id EEDD99C101 for ; Fri, 24 Jan 2020 11:59:26 +1000 (AEST) Received: from mba2.fritz.box ([80.101.112.122]) by smtp-cloud8.xs4all.net with ESMTPA id uoFoiQLnVpLtbuoFpiTIlh; Fri, 24 Jan 2020 02:59:25 +0100 From: Paul Ruizendaal Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Message-Id: <13430143-695E-4DBD-A443-9ECCA0FB4283@planet.nl> Date: Fri, 24 Jan 2020 02:59:23 +0100 To: TUHS main list X-Mailer: Apple Mail (2.3445.104.11) X-CMAE-Envelope: MS4wfEb+PC36Y8SVUkXn0c7CgKg7M6vlWOKYM0sYXmzEgmkNLThtV1uUXvEy0vj5i8Aq/OEO6dZlls+1G8Fv19CSGcYkg3BLpkr8gRNOUmj0w8DErlkxterM IdBfDWZLoJVwnlcq6cSv5zUeBDZqMFwwLA3NSOE72+wMQ+TndOUt13gr Subject: Re: [TUHS] Spider (and back to quiz) X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" There is more in that issue of BSTJ, and indeed it seems this was a = precursor. = https://ia801905.us.archive.org/25/items/bstj51-6-1147/bstj51-6-1147_text.= pdf = https://ia801603.us.archive.org/0/items/bstj51-6-1167/bstj51-6-1167_text.p= df The first paper makes mention of repeaters starting to self oscillate, = and a redesign being underway. There is a possibility that a Unix PDP11 was connected to this earlier = network prior to Spider existing, in which case the accepted quiz answer = would be wrong. >> Ugh. Memory lane has a lot of potholes. This was a really long time = ago.=20 >=20 > Many thanks for that post - really interesting! >=20 > I had to look up "Pierce Network", and found it described in the Bell = Journal: > = https://ia801903.us.archive.org/31/items/bstj51-6-1133/bstj51-6-1133_text.= pdf >=20 > In my reading the Spider network is a type of Pierce network. >=20 > However, the network that you remember is indeed most likely different = from Spider: > - it was coax based, whereas the Spider line was a twisted pair > - there was more than one, whereas Spider only ever had one = (operational) loop >=20 > Condon and Weller are acknowledged in the report about Spider as = having done many of its hardware details. The report discusses learnings = from the project and having to tune repeaters is not among them (but = another operational issue with its 'line access modules=E2=80=99 is = discussed). >=20 > All in all, maybe these coax loops were pre-cursors to the Spider = network, without a switch on the loop (=E2=80=9CC=E2=80=9D nodes in the = Pierce paper). It makes sense to first try out the electrical and line = data protocol before starting work on higher level functions. >=20 > I have no idea what a GLANCE G is...