From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: tuhs-bounces@minnie.tuhs.org X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) 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=3.4.1 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id ea29c9b8 for ; Wed, 20 Jun 2018 21:35:43 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 54D7FA17E7; Thu, 21 Jun 2018 07:35:42 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id DBF7C9EDF1; Thu, 21 Jun 2018 07:35:18 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 95C839EDF1; Thu, 21 Jun 2018 07:35:15 +1000 (AEST) Received: from GW.SoftJAR.SE (gw.softjar.se [213.115.73.154]) by minnie.tuhs.org (Postfix) with ESMTP id A2E9E9EDE7 for ; Thu, 21 Jun 2018 07:35:14 +1000 (AEST) Received: from Smurf.BQTnet.SE (178-82-175-247.dynamic.hispeed.ch [178.82.175.247]) by GW.SoftJAR.SE (Postfix) with ESMTPSA id D169738FCCA; Wed, 20 Jun 2018 23:35:10 +0200 (CEST) (envelope-from bqt@update.uu.se) To: Paul Winalski References: <86dcd19d-f805-f338-f190-ab38d1ac82c1@update.uu.se> <20B7C3F5-2E44-41AB-91E4-510451428C83@ccc.com> <2a35f8dd-e8b8-937a-1af9-d18ac31b8be2@update.uu.se> From: Johnny Billquist Message-ID: <60d0717e-b6ed-fc18-b799-76ea4811a6b6@update.uu.se> Date: Wed, 20 Jun 2018 23:35:09 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [TUHS] core X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tuhs@minnie.tuhs.org Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" On 2018-06-20 18:55, Paul Winalski wrote: > On 6/16/18, Johnny Billquist wrote: >> >> After Unibus (if we skip Q-bus) you had SBI, which was also used both >> for controllers (well, mostly bus adaptors) and memory, for the >> VAX-11/780. However, evaluation of where the bottleneck was on that >> machine led to the memory being moved away from SBI for the VAX-86x0 >> machines. SBI never was used much for any direct controllers, but >> instead you had Unibus adapters, so here the Unibus was used as a pure >> I/O bus. > > You forgot the Massbus--commonly used for disk I/O. I didn't try for pure I/O buses. But yes, the Massbus certainly also existed. > SBI on the 11/780 connected the CPU (CPUs, for the 11/782), memory > controller, Unibus controllers, Massbus controllers, and CI > controller. Right. > CI (computer interconnect) was the communications medium for > VAXclusters (including the HSC50 intelligent disk controller). But CI I wouldn't even call a bus. > DEC later introduced another interconnect system called BI, intended > to replace Unibus and Massbus. I think that is where my comment started. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt@softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol