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=-0.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HTML_MESSAGE,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 17536 invoked from network); 25 Sep 2020 00:22:53 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 25 Sep 2020 00:22:53 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 7876F9CED3; Fri, 25 Sep 2020 10:22:52 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 94B5C9B69A; Fri, 25 Sep 2020 10:22:35 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=bsdimp-com.20150623.gappssmtp.com header.i=@bsdimp-com.20150623.gappssmtp.com header.b="b6zT2mcc"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 478159B69A; Fri, 25 Sep 2020 10:22:31 +1000 (AEST) Received: from mail-qt1-f181.google.com (mail-qt1-f181.google.com [209.85.160.181]) by minnie.tuhs.org (Postfix) with ESMTPS id 5E04E93D65 for ; Fri, 25 Sep 2020 10:22:30 +1000 (AEST) Received: by mail-qt1-f181.google.com with SMTP id y11so607708qtn.9 for ; Thu, 24 Sep 2020 17:22:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=A5ZVjElKL6QNp/NY6jpRTO5DJUn0DnkyCIo9766vq3o=; b=b6zT2mccPfy7qMbzUyW5VO4tIiu11orwDjmyXwSYaVrHECunrKa45VVKzSmO3Q3S1o BeMBvaeLby9GsilG9UYIsY0tWwPZtJkpCZrJ+TSK22Ta8JCl4JhCwAdeDlrkRgGNdnNZ kcglnzmliT7hTNprOCh88Lfut4IC2OHKftE8rxwjbQabwxc1Zr7GjQCC4xwd1AhhBWQu RXA9JVvrxIwadyazYZwh02d4WhjeXMlP0D3Fuo52w+qP71EyhaYa4Ojkxvi7xj5QrFDc DeV8sc5psoth7s/0MZuImRX54I1oGm+yZf2IV1ViO9z6quzAbJu45LHuNvyIEAkUFwhD N9JA== 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=A5ZVjElKL6QNp/NY6jpRTO5DJUn0DnkyCIo9766vq3o=; b=b8QtvlA4HusZGji5heoHME67qWt4o7pmUhCDdsBLrhp5yeKt8W4/GdCqdk+Z8t4Ils aX71gOQ7Ch9zfgRrBCxDl8WCJuvraOWaQ6pP2t/0fhQBvBJVYX4+PcK32BBqjQXQq2HP dy3CakIIzVrfvjwwKNZ1iTaYOrpPHSjHE8JytiOiKxj3poDBe+Y7UnwbMotyzuFjieyI yMzLR7RTR1kIomUEis4lmDCsWi54a0Oe2SY3XosgJnVjdnAJzM/43Ez8KrV3P6QTZsRa Yd4Z6sdD+lHtrq3TnY+G4zXGCyJsxv5sIwOCTwbghpgX5w4SUoI4gHs/ojqg4Of9sNrt cC9w== X-Gm-Message-State: AOAM53201J5//l3GD8PuIp1qIoqkuGSPb9/Oy6Irg7rLSGicYHpElcu2 J9RBlr1zaE8LHRVMvc4gMsSd/OXJ5vGQgYsTsDim1w== X-Google-Smtp-Source: ABdhPJy74K7P9bvlgWjYoHn8mapq7Ki+GC3TSphhfz2MlwqItCzpwh6VfzKQ7iK4MQrMl9vqhNXV+vBKOAwv5k+nkO8= X-Received: by 2002:ac8:4548:: with SMTP id z8mr1949886qtn.291.1600993349153; Thu, 24 Sep 2020 17:22:29 -0700 (PDT) MIME-Version: 1.0 References: <202009190151.08J1pYnb066792@tahoe.cs.dartmouth.edu> <202009201842.08KIgn2f022401@freefriends.org> <04211470-AD63-452A-A0BB-6A7A6FD85AAE@gmail.com> <20200925001859.GC53226@eureka.lemis.com> In-Reply-To: <20200925001859.GC53226@eureka.lemis.com> From: Warner Losh Date: Thu, 24 Sep 2020 18:22:18 -0600 Message-ID: To: "Greg 'groggy' Lehey" Content-Type: multipart/alternative; boundary="000000000000dd591705b0184fa2" Subject: Re: [TUHS] One's complement (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: , Cc: The Eunuchs Hysterical Society Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" --000000000000dd591705b0184fa2 Content-Type: text/plain; charset="UTF-8" On Thu, Sep 24, 2020 at 6:20 PM Greg 'groggy' Lehey wrote: > On Wednesday, 23 September 2020 at 22:33:38 -0400, Clem Cole wrote: > > Dave: Seymour used ones complement on the 3000 and 6000 series. > > Maybe there? The primary HLLs I used on the CDC boxes were FTN and > > Pascal, but I would not be surprised if that was were you saw it. > > I think most of the bigger pre-IBM 360 machines used one's complement. > Didn't the PDP-10? I knew it not only from the CDC 3200 and 3800, but > primarily from Univac (1108 and 494). The Univac techies explained to > me that the primary arithmetic function was subtraction; addition was > subtracting the complement. And that worked faster with one's > complement. > Don't know about the others, but I'm pretty sure PDP-10 wasn't 1's compliment / was 2's compliment.. Warner --000000000000dd591705b0184fa2 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Thu, Sep 24, 2020 at 6:20 PM Greg = 'groggy' Lehey <grog@lemis.com= > wrote:
= On Wednesday, 23 September 2020 at 22:33:38 -0400, Clem Cole wrote:
> Dave: Seymour used ones complement on the 3000 and 6000 series.
> Maybe there?=C2=A0 =C2=A0The primary HLLs I used on the CDC boxes were= FTN and
> Pascal, but I would not be surprised if that was were you saw it.

I think most of the bigger pre-IBM 360 machines used one's complement.<= br> Didn't the PDP-10?=C2=A0 I knew it not only from the CDC 3200 and 3800,= but
primarily from Univac (1108 and 494).=C2=A0 The Univac techies explained to=
me that the primary arithmetic function was subtraction; addition was
subtracting the complement.=C2=A0 And that worked faster with one's
complement.

Don't know about the ot= hers, but I'm pretty sure PDP-10 wasn't 1's compliment=C2=A0/ w= as 2's compliment..

Warner=C2=A0
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