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 autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 18682 invoked from network); 30 Nov 2021 15:32:29 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 30 Nov 2021 15:32:29 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 9E6349CF1E; Wed, 1 Dec 2021 01:32:26 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 0D3BC93D53; Wed, 1 Dec 2021 01:32:06 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id A1EFF93D53; Wed, 1 Dec 2021 01:30:05 +1000 (AEST) Received: from freefriends.org (freefriends.org [96.88.95.60]) by minnie.tuhs.org (Postfix) with ESMTPS id DD1A993D29 for ; Wed, 1 Dec 2021 01:30:04 +1000 (AEST) X-Envelope-From: arnold@skeeve.com Received: from freefriends.org (freefriends.org [96.88.95.60]) by freefriends.org (8.14.7/8.14.7) with ESMTP id 1AUFU2Y0015231 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 30 Nov 2021 08:30:03 -0700 Received: (from arnold@localhost) by freefriends.org (8.14.7/8.14.7/Submit) id 1AUFU2eC015214; Tue, 30 Nov 2021 08:30:02 -0700 From: arnold@skeeve.com Message-Id: <202111301530.1AUFU2eC015214@freefriends.org> X-Authentication-Warning: frenzy.freefriends.org: arnold set sender to arnold@skeeve.com using -f Date: Tue, 30 Nov 2021 08:30:02 -0700 To: tuhs@minnie.tuhs.org, ron@ronnatalie.com, pbirkel@gmail.com References: <010901d7e5c1$4a0c7c20$de257460$@gmail.com> In-Reply-To: User-Agent: Heirloom mailx 12.5 7/5/10 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Subject: Re: [TUHS] Encoding an ISA: Random Logic vs. Control Stores 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: eugene@soe.ucsc.edu Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" Can someone please explain why it's called "random" logic? Discrete logic I understand (more or less), but I've not heard the term "random" used in this context before now. Thanks, Arnold "Ron Natalie" wrote: > Indeed, the early PDPs (10/15/20) had no microprogramming at all. Even > the early microprogrammed ones used "random logic" to implement that. > It would take ten years before large scale integration took over. The > PDP-11/44 in 1979 was the last of the discrete logic CPUs. > > > ------ Original Message ------ > From: pbirkel@gmail.com > To: "'TUHS main list'" > Cc: "'Eugene Miya'" > Sent: 11/30/2021 3:07:15 AM > Subject: [TUHS] Encoding an ISA: Random Logic vs. Control Stores > > >I believe that the PDP-11 ISA was defined at a time when DEC was still using > >random logic rather than a control stor >