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=-1.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 2085 invoked from network); 3 Feb 2021 21:10:34 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 3 Feb 2021 21:10:34 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 6124E9C9E2; Thu, 4 Feb 2021 07:10:31 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id D4E179BA43; Thu, 4 Feb 2021 07:10:09 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=pass (2048-bit key; unprotected) header.d=cfcl.com header.i=@cfcl.com header.b="lLUya+nr"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 0213B9BA43; Thu, 4 Feb 2021 07:10:06 +1000 (AEST) Received: from mail-pj1-f44.google.com (mail-pj1-f44.google.com [209.85.216.44]) by minnie.tuhs.org (Postfix) with ESMTPS id E85F99BA40 for ; Thu, 4 Feb 2021 07:10:04 +1000 (AEST) Received: by mail-pj1-f44.google.com with SMTP id s24so413387pjp.5 for ; Wed, 03 Feb 2021 13:10:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cfcl.com; s=google; h=mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; bh=XiEjcp9f80wHTgtHZPQSwOcP9wqu7IQnJzajrukv8Ek=; b=lLUya+nrTzbd+gJTdLDgO40FJmfpkqALBhpfEJzt/C77ZI1hviBOqA2D8ewQ0QhIag vuIMXeN/qPBzLIaoq1bsVt24nUZtppkvhk8voGY3I2ytIYZcHxSolCtirW66xNCOiNZy /+pdQcub7qaUb7VljVTZZD02qTI+oSSY90kjORAWA6Vu6xDrztKcsW9eoUP0qTY/azPQ V2E2KN98vaX4epldgMeeeuJ97pPAsglSh3CpLvs05C7L85gCu4Te61nmnsS/Xa13kdzY sjThP67gT58Mjz+u8AczooJWvQe+PgZcebdGk+J3+FNXLIQo0KxMOGUODUjumzJVm9E3 swMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; bh=XiEjcp9f80wHTgtHZPQSwOcP9wqu7IQnJzajrukv8Ek=; b=kQyZfUGYYARrBlETfZrs7d/+he8yEaKMckw/nOqqWygdPrKtIVGNvj5Ny+izWwqWd/ loKSSIhdQff+vauhrAhSxvGIU8mMi8vTtLMk8rMFp8nKtgTOpHOj+WTlY9jpVxQUMZKV q+nVzaWeO93Z7BV2xVKCZAwHarO6PNtmfyp5MMJ4BlLsLfZ8qSKRSrfxKBk7Bnz31kZm hVzywVMcnLBLJb9Uwn37eypYzLiNJTBR76BlUqk1jb74TjbXSFm+5+b3JlGZqPcOAsUm gfj+kV5/AYPm7qQxcqpVvPLKQXIarm3wN7ozAYL3e0JB2mkGKU78BVnCgJNAWD4E0v5Y vQ5g== X-Gm-Message-State: AOAM531KhdT79lYeSyr53uTvZI6vxbHDzNsZ0bh5ogola619PtMmYuB8 VvHg+1nQM0jwuZrH/1vkglmN+dK4QHIoWA== X-Google-Smtp-Source: ABdhPJwOla0GERzyWk2v+xjWdA5bZfa6mkFAi5SLeroK3sQ1kNnOyfi3PWKQ/u0niPL4zNiF1U6VPw== X-Received: by 2002:a17:90a:a794:: with SMTP id f20mr4705362pjq.185.1612386604114; Wed, 03 Feb 2021 13:10:04 -0800 (PST) Received: from spot.hitronhub.home (24-113-88-45.wavecable.com. [24.113.88.45]) by smtp.gmail.com with ESMTPSA id w12sm2789510pjq.26.2021.02.03.13.10.03 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 03 Feb 2021 13:10:03 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) From: Rich Morin In-Reply-To: Date: Wed, 3 Feb 2021 13:10:02 -0800 Content-Transfer-Encoding: quoted-printable Message-Id: <3268852D-6845-4F4B-8EFC-3A1D78A11059@cfcl.com> References: To: TUHS main list X-Mailer: Apple Mail (2.3608.120.23.2.4) Subject: Re: [TUHS] 2^n-bit operands (Was reviving a bit of WWB) 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" > On Feb 3, 2021, at 12:07, John Cowan wrote: >=20 > On the 36-bit PDP-10, things were better: the sign bit was mostly = ignored and five 7-bit ASCII characters were packed into each word, = again with NUL padding. (Line editors turned on the sign bit to = indicate that this word held an explicit ASCII line number.) The PDP-7, 9, and 15 used 18-bit words, but used the same "5/7 IOPS = ASCII" packing strategy. That is, five 7-bit ASCII characters were = packed into a word pair. Unfortunately, they didn't have the convenient = character manipulation instructions found on the PDP-10, so programmers = had to do shifts, masks, etc. Grumble. -r