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 13546 invoked from network); 25 Sep 2020 15:21:56 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 25 Sep 2020 15:21:56 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 75A939CEEA; Sat, 26 Sep 2020 01:21:49 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 3C47D945A9; Sat, 26 Sep 2020 01:21:14 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 1ED2493D65; Sat, 26 Sep 2020 01:21:10 +1000 (AEST) Received: from mercury.lcs.mit.edu (mercury.lcs.mit.edu [18.26.0.122]) by minnie.tuhs.org (Postfix) with ESMTPS id 5C31C93D65 for ; Sat, 26 Sep 2020 01:21:09 +1000 (AEST) Received: by mercury.lcs.mit.edu (Postfix, from userid 11178) id 2AD1218C0C1; Fri, 25 Sep 2020 11:21:08 -0400 (EDT) To: tuhs@tuhs.org Message-Id: <20200925152108.2AD1218C0C1@mercury.lcs.mit.edu> Date: Fri, 25 Sep 2020 11:21:08 -0400 (EDT) From: jnc@mercury.lcs.mit.edu (Noel Chiappa) 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: jnc@mercury.lcs.mit.edu Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" > From: Warner Losh > I'm pretty sure PDP-10 wasn't 1's compliment / was 2's compliment.. Just to confirm, I pulled out my PDP-10 Hardware Reference Manual; Vol I - CPU (EK-10/20-HR-001), and it does indeed say (pg. 1-12): "The fixed-point arithmetic instructions use 2's complement representations to do binary arithmetic." Selah. Noel