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=-1.0 required=5.0 tests=MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 17192 invoked from network); 25 Sep 2020 00:19:51 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 25 Sep 2020 00:19:51 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 50A5A9CEEE; Fri, 25 Sep 2020 10:19:48 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 4D5B1945A9; Fri, 25 Sep 2020 10:19:05 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 0245C945A9; Fri, 25 Sep 2020 10:19:02 +1000 (AEST) Received: from lax.lemis.com (www.lemis.com [45.32.70.18]) by minnie.tuhs.org (Postfix) with ESMTP id 0C4CE93D65 for ; Fri, 25 Sep 2020 10:19:01 +1000 (AEST) Received: from eureka.lemis.com (aussie-gw.lemis.com [167.179.139.35]) by lax.lemis.com (Postfix) with ESMTP id 46DE02808A; Fri, 25 Sep 2020 00:19:00 +0000 (UTC) Received: by eureka.lemis.com (Postfix, from userid 1004) id 8B42626359A; Fri, 25 Sep 2020 10:18:59 +1000 (AEST) Date: Fri, 25 Sep 2020 10:18:59 +1000 From: Greg 'groggy' Lehey To: Clem Cole Message-ID: <20200925001859.GC53226@eureka.lemis.com> References: <202009190151.08J1pYnb066792@tahoe.cs.dartmouth.edu> <202009201842.08KIgn2f022401@freefriends.org> <04211470-AD63-452A-A0BB-6A7A6FD85AAE@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="p2kqVDKq5asng8Dg" Content-Disposition: inline In-Reply-To: Organization: LEMIS, 29 Stones Road, Dereel, VIC, Australia Phone: +61-3-5309-0418 Mobile: +61-490-494-038. Use only as instructed. WWW-Home-Page: http://www.lemis.com/grog X-PGP-Fingerprint: 9A1B 8202 BCCE B846 F92F 09AC 22E6 F290 507A 4223 User-Agent: Mutt/1.6.1 (2016-04-27) Subject: [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" --p2kqVDKq5asng8Dg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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. Greg -- Sent from my desktop computer. Finger grog@lemis.com for PGP public key. See complete headers for address and phone numbers. This message is digitally signed. If your Microsoft mail program reports problems, please read http://lemis.com/broken-MUA --p2kqVDKq5asng8Dg Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iEYEARECAAYFAl9tN3MACgkQIubykFB6QiOh6QCdEJX0VvWfGQK+1vPgderDsrcF +8MAoJgpjIy8sfHx+hT/Oj9NX6bng56r =Vau4 -----END PGP SIGNATURE----- --p2kqVDKq5asng8Dg--