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=-0.4 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HTML_FONT_LOW_CONTRAST,HTML_IMAGE_ONLY_28,HTML_MESSAGE, MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 6714 invoked from network); 17 Sep 2021 19:44:35 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 17 Sep 2021 19:44:35 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 6B2689CACC; Sat, 18 Sep 2021 05:44:32 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id C8CC19CAB3; Sat, 18 Sep 2021 05:44:08 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=pass (1024-bit key; unprotected) header.d=ccc.com header.i=@ccc.com header.b="fH5RHPi7"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 34DC49CAB3; Sat, 18 Sep 2021 05:44:06 +1000 (AEST) Received: from mail-qk1-f172.google.com (mail-qk1-f172.google.com [209.85.222.172]) by minnie.tuhs.org (Postfix) with ESMTPS id 870629CAB2 for ; Sat, 18 Sep 2021 05:44:05 +1000 (AEST) Received: by mail-qk1-f172.google.com with SMTP id y144so20928293qkb.6 for ; Fri, 17 Sep 2021 12:44:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ccc.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=cVDdIcncI5QUs5Ry/BtfQX44cZAE+04U+yhTipBYm30=; b=fH5RHPi728QW8hRz9+mmD6UDkAblcQANvM5xFC2EMgkm5wpgLxY+TZfYdOD4E8wWVe 1843W8WW/o/rFzc+kph08u1mVbEx+9Y72yT0AN8qcGnyR/tgy4vfzt198GIvtFVuXqUI 6nEw1NvX1EZIa45HMqNtKPItukUoOS9l54RJo= 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=cVDdIcncI5QUs5Ry/BtfQX44cZAE+04U+yhTipBYm30=; b=drGmVDx8buhALQNAgOh45kPKNh/ZuypHoDQ062mG37E/lFmiGk9oejJr+KkSkH2S5A H278fGD+gIE8r2VbSxXz+Sz2+hTU3AQwRSOliuJ3j7E6wGc98i6iJ3/j4z7l9NShuTea +u8xlhJi2DVq0adUbS15GCAICc6cmFQ55yVTBDm3Ccg07Etzl8RCCrMpu67b3tzE4N1i uns6uu7HY58KpYQXVlKZJcnX18Fl17ryPE3znDCFN/Q385tGaioXh8IZsMirDJXQaOXm OoN1b1kJAEgiQ0F0p4/gVSHMojDrTz5lv70BnmFRJbSo3umYMU3GwipbnE/UErtcf3fX lpeA== X-Gm-Message-State: AOAM531uL9hxcZhkYTfzCsCroy8Fd3cqE2zXhFv99tnJVt82wf/bIsX2 +4gKacxYsEOq5A5wEQ51t6C4wkFblhK4uNNz6atTq87+Z3c= X-Google-Smtp-Source: ABdhPJw8YHUvZ3ER3rTGX7rmuBbD3+9ttof2TZ5Snhta4aw6xD4C9yd3qr23G0AawjwHQhR90JzxgPyCmR0h+iKV4Zw= X-Received: by 2002:a05:620a:25e:: with SMTP id q30mr9346709qkn.159.1631907844237; Fri, 17 Sep 2021 12:44:04 -0700 (PDT) MIME-Version: 1.0 References: <20210917153523.96CC618C0A6@mercury.lcs.mit.edu> <202109171828.18HISiR5057486@ultimate.com> In-Reply-To: <202109171828.18HISiR5057486@ultimate.com> From: Clem Cole Date: Fri, 17 Sep 2021 15:43:38 -0400 Message-ID: To: Phil Budne Content-Type: multipart/alternative; boundary="0000000000005cbe8b05cc362748" Subject: Re: [TUHS] Unix for PDP11/20 w/o mmu or paging option 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" --0000000000005cbe8b05cc362748 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Sep 17, 2021 at 2:51 PM Phil Budne wrote: > The earliest Unix running on the 11/20 requires not only the custom MMU, > but also a fixed-head disk Right, a 4Mbyte RF11/RS11 which Ken refers to as /dev/drum in this code. That lived for a pretty long time - at least thru the Sixth edition, IIRC. > (the genesis of the tiny root partition?), I thought the original system just swapped to it, no mounted FS on it, but unless someone knows for sure, it means staring at Ken's assembler listings for V1 that Warner mentioned earlier. > so I agree with Noel that MINI-UNIX and LSX, while not "historically > correct" for your hardware are a good fit, and that > building a working system on simulated hardware would likely be the easie= st > route. > > Phil > =E1=90=A7 --0000000000005cbe8b05cc362748 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


so I agree with Noel that MINI-UNIX and LSX, w= hile not "historically correct" for your hardware are = a good fit, and that
building a working system on simulated hardware would likely be the easiest route.

Phil
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