From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 32329 invoked from network); 10 Jun 2021 08:05:15 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 10 Jun 2021 08:05:15 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 12ABF93DBF; Thu, 10 Jun 2021 18:05:13 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 3192B93D1B; Thu, 10 Jun 2021 18:05:00 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 04DC293D1B; Thu, 10 Jun 2021 18:04:57 +1000 (AEST) Received: from freefriends.org (freefriends.org [96.88.95.60]) by minnie.tuhs.org (Postfix) with ESMTPS id 957B193D06 for ; Thu, 10 Jun 2021 18:04:56 +1000 (AEST) X-Envelope-From: arnold@skeeve.com Received: from freefriends.org (freefriends.org [96.88.95.60]) by freefriends.org (8.14.7/8.14.7) with ESMTP id 15A84o4R014059 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 10 Jun 2021 02:04:51 -0600 Received: (from arnold@localhost) by freefriends.org (8.14.7/8.14.7/Submit) id 15A84oTN014058; Thu, 10 Jun 2021 02:04:50 -0600 From: arnold@skeeve.com Message-Id: <202106100804.15A84oTN014058@freefriends.org> X-Authentication-Warning: frenzy.freefriends.org: arnold set sender to arnold@skeeve.com using -f Date: Thu, 10 Jun 2021 02:04:50 -0600 To: tuhs@minnie.tuhs.org, imp@bsdimp.com, arnold@skeeve.com References: <202106100758.15A7weqm013326@freefriends.org> In-Reply-To: <202106100758.15A7weqm013326@freefriends.org> User-Agent: Heirloom mailx 12.5 7/5/10 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Subject: Re: [TUHS] System IV 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" One other thing that was cool was that the doc defined UNIX as "an operating system for the DEC PDP-11, DEC Vax, and the IBM System/370". :-) arnold@skeeve.com wrote: > Warner Losh wrote: > > > So I've seen a number of places that talk about Unix TS 3.0 -> 4.0 -> 5.0 > > progression and how System III was released and System V was released and > > System IV was internal only. > > > > What I've not seen is the "why" part of this. Why was it internal only? > > > > Warner > > I did some contract programming at Southern Bell (one of the operating > companies) for a while, starting in the summer of 1982. We used > USG Unix 4.0 on a PDP-11/70. There were also vaxen. > > It was no longer being called PWB by then. In fact, I think that PWB > was V6 based and an ancestor of System III. > > System III had been released to the world. When I asked why AT&T > hadn't released Unix 4.0, I was told that the policy was to release > one version behind what was being run internally. > > After the Bell System break up (1/1/1984), AT&T decided to just > release what was current, thus the jump to System V, with "System IV" > never having gotten outside the Bell System. > > When I was doing the contract work, although we were on Unix 4.0, > we used documentation from Unix 3.0; they didn't bother reprinting / > updating the manuals since the primary changes were apparently > performance improvements in the kernel. (For example, they moved > to hash tables for many things instead of simple linked lists.) > > I still have the reference manual and the photocopies I made of all > the other documentation. :-) > > There was also a screen editor, named 'se' (NOT related to the Georgia > Tech 'se' editor) which they'd managed to shoehorn onto the '11. > It was kinda cool. I used both it and 'ed'. vi was also available but > I found the modal stuff weird and didn't end up learning it until a year > or two later. :-) > > Hope this is of interest. > > Arnold