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 c5f6a590 for ; Mon, 24 Jun 2019 16:34:20 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 540659BCDD; Tue, 25 Jun 2019 02:34:19 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id C9B5A9BC44; Tue, 25 Jun 2019 02:34:07 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="le3M5Rr0"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id AD7EA9BC44; Tue, 25 Jun 2019 02:34:06 +1000 (AEST) Received: from mail-ot1-f44.google.com (mail-ot1-f44.google.com [209.85.210.44]) by minnie.tuhs.org (Postfix) with ESMTPS id 201359BC43 for ; Tue, 25 Jun 2019 02:34:06 +1000 (AEST) Received: by mail-ot1-f44.google.com with SMTP id x21so14101000otq.12 for ; Mon, 24 Jun 2019 09:34:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=+hWtVniLXkWGyfamsMB+/B/1IDgqwJmMNGV8ah1CtpM=; b=le3M5Rr06RiZ0ToPstBUGD9Y4dM0izalVNk0hymfXyg7f60sw/aKrvaKNJvIgYUC8W Ln1N3bafFpUPIds8xwYdFGMLaSZy49wic+XTYFsYVD4ObUOletUdl9NKvsSDbK+/VUv6 2Ns26qrD5HKSXhmIBkZ5RaoQwp/QJylhH3WEnILHRe4CXuoeRwPB/GoWnr5NZqMGgGT1 fhQyQplRZqObdTDf4zVyyb0jpbKIhd3888zvUUH1/9MLCYzwQLyPtxMoO8wIGwEiLKLM iLX/WWQOyXdmNNTC/65CZmnpwviU67TjmqQbX2lnhiH74w0K852Y2y7bP2w4/FUiwkeM e8NQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=+hWtVniLXkWGyfamsMB+/B/1IDgqwJmMNGV8ah1CtpM=; b=m7mEM4kEx0kcZjSzYoIe+Cwf3AJZDByEZlIP1fCREiFD/STvZGtK0SqYLPrUyqqDdJ 1UFzjM+/GE9EADbynFX2fnJZ2HOz+UsTmz7OhyHnZuWICfzysinpHhH8YgEejZR0Kdke B0fuGe8EXHpgXPOoeSBd95e+ipLYfxUgCKxsUO1sm3hweMrAAqEU3lK0i9Udfkno7MAQ ZoYYS3dySFhIcvFtqtzme8AxsDHNNhVHokeK0VuU1v0Byk4e170x02oK/B/X2QYbPWJl CXcydzjjUKA7Xo8/n9TFiN367GL3HkEYNVd1UdcUb3veZit0fZPR5OqCGqwyL+WnSfcz igaQ== X-Gm-Message-State: APjAAAXqKzW5lotiSHUqXy3mC2gK3+nXjnG2RkuFTHVpGJ6QTRkTQtUu F7JMTwCO5yAyFlrmSBnlacl9OLvKsHXFMe9xRnbFs3YL X-Google-Smtp-Source: APXvYqx/PgthdSQ/873jJEwVE0vsuwiuEDsDh07dWA6h1uFPSL+ENuAJuGsS6jTLu6DccHFd3byhuLlN41a+kULqkUs= X-Received: by 2002:a9d:27e8:: with SMTP id c95mr91296486otb.101.1561394045280; Mon, 24 Jun 2019 09:34:05 -0700 (PDT) MIME-Version: 1.0 References: <20190622181719.E10E918C0B4@mercury.lcs.mit.edu> In-Reply-To: From: ron minnich Date: Mon, 24 Jun 2019 09:33:54 -0700 Message-ID: To: Noel Chiappa Content-Type: text/plain; charset="UTF-8" Subject: Re: [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: , Cc: TUHS main list Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" ah nvm, yeah, KS11. Wow. That was just about the time I was getting started in this game, memory is so hazy. On Mon, Jun 24, 2019 at 9:21 AM ron minnich wrote: > > just double checking, in case the odd.html had a typo: it was a KS11, > not a KT11-B? Is there any chance there was an error in recollection? > > ron > > On Sat, Jun 22, 2019 at 11:18 AM Noel Chiappa wrote: > > > > This is an appeal to the few really-old-timers (i.e. who used the PDP-11/20 > > version of Unix) on the list to see if they remember _anything_ of the KS11 > > memory mapping unit used on that machine. > > > > Next to nothing is known of the KS11. Dennis' page "Odd Comments and Strange > > Doings in Unix": > > > > https://www.bell-labs.com/usr/dmr/www/odd.html > > > > has a story involving it (at the end), and that is all I've ever been able > > to find out about it. > > > > I don't expect documentation, but I am hoping someone will remember > > _basically_ what it did. My original guess as to its functionality, from that > > page, was that it's not part of the CPU, but a UNIBUS device, placed between > > the UNIBUS leaving the CPU, and the rest of the the bus, which perhaps mapped > > addresses around (and definitely limited user access to I/O page addresses). > > > > It might also have mapped part of the UNIBUS space which the -11/20 CPU _can_ > > see (i.e. in the 0-56KB range) up to UNIBUS higher addresses, where 'extra' > > memory is configured - but that's just a guess; but it is an example of the > > kind of info I'd like to find out about it - just the briefest of high-level > > descriptions would be an improvement on what little we have now! > > > > On re-reading that page, I see it apparently supported some sort of > > user/kernel mode distinction, which might have require a tie-in to the > > CPU. (But not necessarily; if there was a flop in the KS11 which stored the > > 'CPU mode' bit, it might be automatically cleared on all interrupts. Not sure > > how it would have handled traps, though.) > > > > Even extremely dim memories will be an improvement on the blank canvas we > > have now! > > > > Noel