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, MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 6041 invoked from network); 1 Dec 2021 17:12:19 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 1 Dec 2021 17:12:19 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 56EA89CE1A; Thu, 2 Dec 2021 03:12:15 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id B4A669C78B; Thu, 2 Dec 2021 03:09:07 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ronnatalie.com header.i=@ronnatalie.com header.b="dYbOtetq"; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=messagingengine.com header.i=@messagingengine.com header.b="NwVqxBEu"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 772249C78B; Thu, 2 Dec 2021 03:09:05 +1000 (AEST) Received: from wout1-smtp.messagingengine.com (wout1-smtp.messagingengine.com [64.147.123.24]) by minnie.tuhs.org (Postfix) with ESMTPS id 8936B94502 for ; Thu, 2 Dec 2021 03:09:04 +1000 (AEST) Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailout.west.internal (Postfix) with ESMTP id A06623201CDC; Wed, 1 Dec 2021 12:09:03 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute3.internal (MEProxy); Wed, 01 Dec 2021 12:09:03 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ronnatalie.com; h=from:to:subject:date:message-id:in-reply-to:references :reply-to:mime-version:content-type:content-transfer-encoding; s=fm2; bh=NzL50wfndw1JjnjyftpteOYYnd3Maw+kT9lS8Gc7WGo=; b=dYbOt etqg4n5+KflZ89oN6R+DkIocHaVzcyxpu5tNS/hGC8SfulNLIpTTvAqTOy+wb88c esFVY6TciMQ6+W2lVv18LiUhwqssL05ZipZ4plrw5x+QCyfc7LsXWP5HnpQhQYhH ipWrU96HptoKQHjs6lDe1Yr6j4QeqbitI6Q0/ae3eRz11U4zT4D5OFC+Klhz1jQ7 95w2HACs4p8G3kFOiTp9uH/ioazdnD/OCVNmZxfvytS99n5dMBGK6FAvOsYHEnMh KFPfO4HjdevGT8T4rEPQzHGLt6WvWvpRmVuFM3rS12LVXi+nGFZ+SW6CT3AGZUuX BxcYA74nk9de4wUIA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :reply-to:subject:to:x-me-proxy:x-me-proxy:x-me-sender :x-me-sender:x-sasl-enc; s=fm1; bh=NzL50wfndw1JjnjyftpteOYYnd3Ma w+kT9lS8Gc7WGo=; b=NwVqxBEuXbaTH5ANitaXEXjTpsHYUL66JOFYOwclC7gPV 2WKQ1xVHb4IcbPjenzX9TKYuRNGrOiXj5m4AwMBYamD73BDu8TZHWGeq3W0Hkj0P s4C4qHhZisxXdVY08OJubWUNi3CDBzAdWNyXrNdYCfx9DQymS4/br94fmQdqX4E6 uvS7Wnn3VyEnLyR+rRmK+5Ia8XCHrcGyEBa1wvZTZoDYiYpwYvoAMhX7o3Sy5aR5 nl/IQbfhUcImeeNK5sY4dnTBRstZHRreqeKA+8YmIZAivhtDZaxisCLeM3y/0WgL z3qp0vcWJXhRhOzCsKJqHnOScUi0wR7o5eE9f2jKw== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvuddrieefgdeljecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpefhvffufffkjghfrhgfgggtgfesthhqredttderjeenucfhrhhomhepfdftohhn ucfprghtrghlihgvfdcuoehrohhnsehrohhnnhgrthgrlhhivgdrtghomheqnecuggftrf grthhtvghrnhepffduteevteffueethfelledvtdefhfekhfdvgfehudejveeijeekvddv tdejveegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomh eprhhonhesrhhonhhnrghtrghlihgvrdgtohhm X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 1 Dec 2021 12:09:02 -0500 (EST) From: "Ron Natalie" To: "ron minnich" , "TUHS main list" Date: Wed, 01 Dec 2021 17:08:58 +0000 Message-Id: In-Reply-To: References: <010901d7e5c1$4a0c7c20$de257460$@gmail.com> <202111301530.1AUFU2eC015214@freefriends.org> <202111301850.1AUIovEG006894@darkstar.fourwinds.com> <202111302307.1AUN7TBv066715@darkstar.fourwinds.com> <202112010500.1B150a48077541@darkstar.fourwinds.com> <028601d7e67c$87e1bbd0$97a53370$@gmail.com> User-Agent: eM_Client/8.2.1659.0 Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable 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: , Reply-To: Ron Natalie Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" There seems to be confusion here about microcoding vs. discrete=20 logic/LSI. All but the initial 11/20 (and its variants) are=20 microcoded. That is there is a programmed sequence of operations in=20 the execution of the individual instructions. The less popular 11/60=20 even featrued a writable control store. All of the early PDP-11s were built out of discrete logic. Relatively=20 simplistic combinations of various logic chips, gates, flip flops, etc..=20 A lot of these were encapsulated into the DEC "Flip Chips" small=20 circuit boards to do common sets of operations. While this is by=20 modern standards, crude, it doesn't preclude microcoding and other=20 advanced tasks. I worked on a supercomputer built that way (Denelcor=20 HEP built largely out of Motorola 10800-series ECL chips). As I previously stated, the 11/44 was the last of the discrete logic=20 PDP's in 1979. The later systems were all large scale integrated=20 circuit based. First starting with the LSI-11/03 on the Q bus, quickly=20 followed by the 11/23 and the Unibus 11/24.