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 8097 invoked from network); 30 Nov 2021 23:10:16 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 30 Nov 2021 23:10:16 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id AA4609CF1A; Wed, 1 Dec 2021 09:10:11 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id C855F9CD64; Wed, 1 Dec 2021 09:07:33 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 2477B9C78B; Wed, 1 Dec 2021 09:07:31 +1000 (AEST) Received: from darkstar.fourwinds.com (fourwinds.com [63.64.179.162]) by minnie.tuhs.org (Postfix) with ESMTPS id B148994502 for ; Wed, 1 Dec 2021 09:07:30 +1000 (AEST) Received: from darkstar.fourwinds.com (localhost [127.0.0.1]) by darkstar.fourwinds.com (8.16.1/8.15.2) with ESMTP id 1AUN7TP5066718 for ; Tue, 30 Nov 2021 15:07:29 -0800 Received: from darkstar.fourwinds.com (jon@localhost) by darkstar.fourwinds.com (8.16.1/8.15.2/Submit) with ESMTP id 1AUN7TBv066715 for ; Tue, 30 Nov 2021 15:07:29 -0800 Message-Id: <202111302307.1AUN7TBv066715@darkstar.fourwinds.com> From: Jon Steinhart To: tuhs@minnie.tuhs.org In-reply-to: References: <010901d7e5c1$4a0c7c20$de257460$@gmail.com> <202111301530.1AUFU2eC015214@freefriends.org> <202111301850.1AUIovEG006894@darkstar.fourwinds.com> Comments: In-reply-to Humm message dated "Tue, 30 Nov 2021 21:45:50 +0000." MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-ID: <66713.1638313649.1@darkstar.fourwinds.com> Content-Transfer-Encoding: 8bit Date: Tue, 30 Nov 2021 15:07:29 -0800 X-JON-SPAM: local delivery 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: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" Humm writes: > Quoth Jon Steinhart: > >arnold@skeeve.com writes: > >> 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. > > > >Well, as a recovered random logic designer, I think that the name comes > >from there being no particular structure to the logic. Many parts of > >logic design are very regular, think memory. But that regularity doesn't > >exist when, for example, decoding irregular instructions. > > Now that’s a “random” definition. > > -- > Humm OK, I'll try again. For anybody familiar with Portland, Oregon, it's the difference between driving in Northwest where there's a rectangular grid numbered in one direction and alphabetical in the other, and approaching the Ross Island Bridge from the west side which appears to be designed by someone following a goat while tripping their brains out. One can address Northwest Portland quite easily unlike getting onto the Ross Island Bridge.