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=-0.6 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 c1f77e43 for ; Sun, 23 Jun 2019 02:37:58 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id CDDB594F92; Sun, 23 Jun 2019 12:37:56 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id EE20994F6D; Sun, 23 Jun 2019 12:37:25 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="bQNH8wbZ"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 782B294F68; Sun, 23 Jun 2019 12:37:22 +1000 (AEST) Received: from mail-vs1-f48.google.com (mail-vs1-f48.google.com [209.85.217.48]) by minnie.tuhs.org (Postfix) with ESMTPS id 7E1EA94F67 for ; Sun, 23 Jun 2019 12:37:21 +1000 (AEST) Received: by mail-vs1-f48.google.com with SMTP id k9so6376043vso.5 for ; Sat, 22 Jun 2019 19:37:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=0k3LeGJzL/bOR9BwytTTlYrSIcl8NKaAE7LnfVMjH0I=; b=bQNH8wbZexFSrmC9l7p5H8JISLbQEjXf7C6iKS/L4SB+rlgEzG+9FLtWx63l0cjPMI 8BZ4bWMhnmUXUGz2tbiZRapwcxpfbYgMhT1Z5PVmRak/vSG1E4IjkUaUa4mgaiQ0wmH6 Ibk5wssuuxx61DCZNBLhjgQm7sNaA8Ju7mm0IblplZ/XTKzoDib4PzO6N8DH0Pw4L3UZ v/FdaOiFieuo8xm0iq0J3LVPfhj0HoBZbcWoScof66srn9kxMNEguENVIdBOeqt+87hZ aHOWOmdSIMJSBNB3/mpIzWqSsGeLDr3SkKvIUmPIUowTwlzVqMgkGoMPdnHYIMEfMKSY 4EDg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=0k3LeGJzL/bOR9BwytTTlYrSIcl8NKaAE7LnfVMjH0I=; b=p5G6ELQ6qt+V8cOywMcoj63T9blRP6hayGeyo669WM7/WmpCfOPn9R/Lfff5fW2FQl 3KfmwvFUqg8+jU38SaWiyvNteWl6hK2fkHTi4gKxZ4Bk7uCvk5HPwM0cB6dav5SlkslX fN2oNpsFSwi8b03QOiq5h+oUs20wwnl8kMdYdSw9rh2nkxQX+ComZ0+2/hJRqPl0lBiR iDaUv4eK3ToLMrfokJehWsTY9Znk5JA/GN6/HM1ls7XhYkPtTyhmHjinYWMjd8OXySyy Mgy3kYxPmYDejbRHuoSwSDgZMDx5pOcO7OL487BT+hBIb7qVV+tdDJ2WY38ZKum/cVwD 07VQ== X-Gm-Message-State: APjAAAXY+g5oOwgVdTC6FJ0YyoLuuNFyl8EhHyG7MMsUadynKHQ0kuh1 qYdyHGRO8IXU8SG2RSZM2IppK5kBKLSb6YKvodAJ X-Google-Smtp-Source: APXvYqwoPBTK+Cj+7BlSfFn3PMvycxnBKYjodsMnYLXQJGg7sS0rY9ycQCZpcV9oja0D6wh6vYcvsq4PwmgRB0wj9PE= X-Received: by 2002:a67:8cc7:: with SMTP id o190mr23150319vsd.24.1561257440468; Sat, 22 Jun 2019 19:37:20 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:ab0:7515:0:0:0:0:0 with HTTP; Sat, 22 Jun 2019 19:37:19 -0700 (PDT) From: Rudi Blom Date: Sun, 23 Jun 2019 09:37:19 +0700 Message-ID: To: tuhs Content-Type: text/plain; charset="UTF-8" Subject: [TUHS] Any oldtimers remember anything about the KS11 on the 11/20? 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" Probably already known, but to be sure Interesting options: MX11 - Memory Extension Option: this enabled the usage of 128 KW memory (18-bit addressing range); KS11: this option provided hardware memory protection, which the plain /20 lacked. Both options were developed by the Digital CSS (Computer Special Systems). http://hampage.hu/pdp-11/1120.html PS the page listed below has a very nice picture of the 'two fathers of UNIX" working on a PDP-11/20 http://hampage.hu/unix/unix1.html