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=-1.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FROM,HTML_MESSAGE,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 9441 invoked from network); 30 Nov 2021 23:21:50 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 30 Nov 2021 23:21:50 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id B46F49CD64; Wed, 1 Dec 2021 09:21:48 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 5624C9C78B; Wed, 1 Dec 2021 09:18:57 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="f60jgC1E"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 397AB9C78B; Wed, 1 Dec 2021 09:18:55 +1000 (AEST) Received: from mail-pg1-f177.google.com (mail-pg1-f177.google.com [209.85.215.177]) by minnie.tuhs.org (Postfix) with ESMTPS id BAD0B94502 for ; Wed, 1 Dec 2021 09:18:54 +1000 (AEST) Received: by mail-pg1-f177.google.com with SMTP id s137so21533311pgs.5 for ; Tue, 30 Nov 2021 15:18:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=2t3m9JyWLNVZ5Xjvtq8Ig4xaTMhNSTosH0QjMSgtRYc=; b=f60jgC1Eop80i0yIQQ/LOUZmmo2zkhW7M5guMbsaP6+O0gL7QkPwMz3TfyNEFTz/eh eOBpaALpvh7xg+04LmORnTgv/7u5bKjcuJR52j9nwSMPXwLjTcJLVvbpZEpkxykswLRl kxBSHafSskSK0qGgENnkXganhzlPa8EQse8lppPFDA8I2kBQ4Tt0Fr8oU/kb1lhKG0Eg eVYpDMWIA1M7akpMBPbIthEdteNG6LNwiybYrA569Qg2wfi6XMjFlYpn3rHQtTMIHAVA nkdcIcyaM1SEHjf44ZJnF6bdD+xuuxTK93Y7O7iK4ny49+0MHViTMUwCcYBvQi8ZzwU8 P7Lg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=2t3m9JyWLNVZ5Xjvtq8Ig4xaTMhNSTosH0QjMSgtRYc=; b=3vhtcYISJzZqXQwG1IOo3vLV850GKcUc+1aYAPesRu5+yAv3BQh5VbhwuAOC8U0ky2 oIt9zpSA59b+SJEmDrTxmVpENMOVFXmjO51tc0LrUdysBWeFChIeUfIypeCqouf+/uD/ a2sSlL76sStC4acPpGPiPS3KKI+9Wp4v2fsp/HL8oqyoMv/11PxBmtRRrnTkSmXFw49A zt5qM3nW5OHslxr6Sm8DVYaaprWAIa6D6OAESzu2eD3NUPPemkAS9WCsFSBuXWmhWbgm xSpO/JlJ9Q3fobo3mVg0juEvBWH0VAhVV7DjLhRWKF87oL9JXgjfkOGHyKtBhXZ2otH2 WYnQ== X-Gm-Message-State: AOAM532mB2CQeYKp6eTNfHFN05lZ/RE0sgrOI/AvL1WzaPVdKVf31kej gk+xert1Rs243e2fRFJsL4R9m5D2r+OpymJutzs= X-Google-Smtp-Source: ABdhPJxfUdvIwmCfskrPNhnMfBOmuc1XVbEwKCQ5SYEY3DYPVLF3f9KqvISA9J7Zyr4B8R6B2M8JTKu3UEdOOQjIRfc= X-Received: by 2002:a63:f24:: with SMTP id e36mr1829723pgl.4.1638314333990; Tue, 30 Nov 2021 15:18:53 -0800 (PST) MIME-Version: 1.0 References: <010901d7e5c1$4a0c7c20$de257460$@gmail.com> <202111301530.1AUFU2eC015214@freefriends.org> <202111301850.1AUIovEG006894@darkstar.fourwinds.com> <202111302307.1AUN7TBv066715@darkstar.fourwinds.com> In-Reply-To: <202111302307.1AUN7TBv066715@darkstar.fourwinds.com> From: Henry Bent Date: Tue, 30 Nov 2021 18:18:43 -0500 Message-ID: To: Jon Steinhart Content-Type: multipart/alternative; boundary="000000000000e874c505d209c7c9" 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: TUHS main list Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" --000000000000e874c505d209c7c9 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 30 Nov 2021 at 18:10, Jon Steinhart wrote: > 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 come= s > > >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=E2=80=99s a =E2=80=9Crandom=E2=80=9D 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 addres= s > Northwest Portland quite easily unlike getting onto the Ross Island Bridg= e. > So - and as I say this as someone who has no direct experience with this level of logic - everything is directly addressable but the difference is in how you get there? -Henry --000000000000e874c505d209c7c9 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Tue, 30 Nov 2021 at 18:10, Jon Steinha= rt <jon@fourwinds.com> wrote= :
Humm writes:
> Quoth Jon Steinhart:
> >arnold@skee= ve.com writes:
> >> Can someone please explain why it's called "random&q= uot; 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.=C2=A0 Many = parts of
> >logic design are very regular, think memory.=C2=A0 But that regula= rity doesn't
> >exist when, for example, decoding irregular instructions.
>
> Now that=E2=80=99s a =E2=80=9Crandom=E2=80=9D definition.
>
> --
> Humm

OK, I'll try again.=C2=A0 For anybody familiar with Portland, Oregon, i= t's the
difference between driving in Northwest where there's a rectangular gri= d
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.=C2=A0 One can add= ress
Northwest Portland quite easily unlike getting onto the Ross Island Bridge.=

So - and as I say this as someone who = has no direct experience with this level of logic - everything is directly = addressable but the difference is in how you get there?

-Henry
--000000000000e874c505d209c7c9--