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=-0.4 required=5.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE, T_DKIM_INVALID 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 7de796fe for ; Wed, 20 Jun 2018 16:56:13 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id E82A7A17D1; Thu, 21 Jun 2018 02:56:12 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id EDCAB9EDF1; Thu, 21 Jun 2018 02:56:02 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=fe4XhoxY; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 253C89EDF1; Thu, 21 Jun 2018 02:56:01 +1000 (AEST) Received: from mail-lf0-f41.google.com (mail-lf0-f41.google.com [209.85.215.41]) by minnie.tuhs.org (Postfix) with ESMTPS id 2A8CA9EDE7 for ; Thu, 21 Jun 2018 02:56:00 +1000 (AEST) Received: by mail-lf0-f41.google.com with SMTP id e13-v6so383760lfc.1 for ; Wed, 20 Jun 2018 09:56:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=dufHAkj0uZfecXhVu0amIaC/sjxP1q79r2rQjRkEl+I=; b=fe4XhoxYo+yQWRu0E4ruDT7ZZkr28gzI3vxgtlotLgJS+fwpi/tmXcm9hjS0kpIK2z ke/VAh+aNeGY42ylNE2ENg18KuLQZvYcChW0nRs9di+nAlBnJ6YhqD52LnOHtWW107Ol Ro219+2AwgLHWVWoKgt6fic19KRJxa1vvU/jBtRX/8a/mdwgvfHyU8A7zMqv6+YiYHbg a9oJBjfpVFOQjDNPfVWKqq1o5doXqXp2h8imwfO22NK3Spj7JYijtZTj7ugKYCnglkuL ncEK5wMILp82C3ChwoMcVi1OrT5CFkcdihHQNeI9lFCv/Mj6DX0gP21mWIUSACBPmyNd eP7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=dufHAkj0uZfecXhVu0amIaC/sjxP1q79r2rQjRkEl+I=; b=ZUY3OF2OvQ7HJJEy+iWMX93vpSzUOZIoFHxYHe2Y07JS241pOkwMhSwk2xmT8aln7C h9TSUuJ1P0fHLZAqomlC5lHBixJ8oS3IzT9mDKTbBwOH6gpEj6jBJSt5WFstnkxvT9s4 fYFI1DNBTt/KEcMCLAuTUFaYR/H5yFQf6z+p2xVAJPRNLzZ8pqR1T0Qt5UCvCEQxk22h AMOGFU9G+P5CYqZjXmZ5co8n2opaur5+j4ATEcV7k+m9pzP5w2TbfBi9ATokBr43VcWl wEIRoWBvfWkokfYa8gmaXMZaoo65RSp75zgs21bzVuYJhSsZnKIzkg2BJQXGTa/a4TSy 88Ig== X-Gm-Message-State: APt69E2KuarYVwXnDC9BEoGMoJOwmTOdTC/u3CiB64YHsIP2+zDwuKGL KucoduhC5GXxouH+OywOpp4u7/hMisSGlJzBzAo= X-Google-Smtp-Source: ADUXVKItlCSHMxrbI5GPuTst+TNMyJxrVDRbRmDzLZsXFscDAoJEHzAqvt/GH9sF89OjwV4KJq1qD07nTppi/Jw/4z8= X-Received: by 2002:a19:7:: with SMTP id 7-v6mr14229786lfa.62.1529513758690; Wed, 20 Jun 2018 09:55:58 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a2e:5901:0:0:0:0:0 with HTTP; Wed, 20 Jun 2018 09:55:58 -0700 (PDT) In-Reply-To: <2a35f8dd-e8b8-937a-1af9-d18ac31b8be2@update.uu.se> 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: Paul Winalski Date: Wed, 20 Jun 2018 12:55:58 -0400 Message-ID: To: Johnny Billquist Content-Type: text/plain; charset="UTF-8" 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 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. SBI on the 11/780 connected the CPU (CPUs, for the 11/782), memory controller, Unibus controllers, Massbus controllers, and CI controller. CI (computer interconnect) was the communications medium for VAXclusters (including the HSC50 intelligent disk controller). DEC later introduced another interconnect system called BI, intended to replace Unibus and Massbus. As we used to say in our software group about all the various busses and interconnects: E Unibus Plurum -Paul W.