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,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 13753 invoked from network); 1 Mar 2022 16:04:37 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 1 Mar 2022 16:04:37 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 102E89CFED; Wed, 2 Mar 2022 02:04:34 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 9D5EA9CC02; Wed, 2 Mar 2022 02:01:54 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="key not found in DNS" (0-bit key; unprotected) header.d=humeweb.com header.i=@humeweb.com header.b="cpsrx5dy"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 4B50F9CC02; Wed, 2 Mar 2022 01:56:15 +1000 (AEST) X-Greylist: delayed 1456 seconds by postgrey-1.36 at minnie.tuhs.org; Wed, 02 Mar 2022 01:56:13 AEST Received: from gateway7.unifiedlayer.com (gateway7.unifiedlayer.com [74.220.194.128]) by minnie.tuhs.org (Postfix) with ESMTPS id D22D29CBCE for ; Wed, 2 Mar 2022 01:56:13 +1000 (AEST) Received: from cm3.websitewelcome.com (unknown [108.167.139.23]) by gateway7.unifiedlayer.com (Postfix) with ESMTP id DAEED200CDF05 for ; Tue, 1 Mar 2022 09:31:38 -0600 (CST) Received: from dallas136.arvixeshared.com ([23.91.70.4]) by cmsmtp with ESMTP id P4TSnQfRSpPDoP4TSnRNFq; Tue, 01 Mar 2022 09:31:38 -0600 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=humeweb.com ; s=default; h=To:References:Message-Id:Content-Transfer-Encoding:Cc:Date: In-Reply-To:From:Subject:Mime-Version:Content-Type:Sender:Reply-To:Content-ID :Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To: Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe :List-Post:List-Owner:List-Archive; bh=i8CtgPSFZ+cqNHwX15zEHNVKNpZvKqwBjk57dX6MiVE=; b=cpsrx5dyhmoc88URPWQixCzBW2 Zj3I7qBL9q14GAwlGixtUEi2ub9sTi22yBjpdf4QJRRaKHu+XYzQ6OT6Hgd3eqqiWQ2EXj3wFyaHy c3jxcY8sPUJ3NSzdJWvdBZ4QdN1DozvpBqKE4/8/5unDvZXnIpX8riFPhg6cLW3afc0A=; Received: from 99-98-248-85.lightspeed.irvnca.sbcglobal.net ([99.98.248.85]:52184 helo=smtpclient.apple) by dallas136.arvixeshared.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1nP4TS-003Hho-Hn; Tue, 01 Mar 2022 09:31:38 -0600 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.60.0.1.1\)) From: Andrew Hume In-Reply-To: Date: Tue, 1 Mar 2022 07:31:36 -0800 Content-Transfer-Encoding: quoted-printable Message-Id: <13902322-32C6-4591-9027-A50691146758@humeweb.com> References: <4e3c05d2-2496-b917-f1f4-1c6cba9ef58a@gmail.com> To: Clem Cole X-Mailer: Apple Mail (2.3693.60.0.1.1) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - dallas136.arvixeshared.com X-AntiAbuse: Original Domain - minnie.tuhs.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - humeweb.com X-BWhitelist: no X-Source-IP: 99.98.248.85 X-Source-L: No X-Exim-ID: 1nP4TS-003Hho-Hn X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 99-98-248-85.lightspeed.irvnca.sbcglobal.net (smtpclient.apple) [99.98.248.85]:52184 X-Source-Auth: andrew@humeweb.com X-Email-Count: 2 X-Source-Cap: YWh1bWU7YWh1bWU7ZGFsbGFzMTM2LmFydml4ZXNoYXJlZC5jb20= X-Local-Domain: yes Subject: Re: [TUHS] Memory on Lion's v6 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" i should also point out that lions would have had access to a PDP 11/70 running with 4MB of main memory at the Australian Graduate School of Management (where i worked for a while after graduating). but i don=E2=80=99t recall him doing = anything on that machine. > On Feb 28, 2022, at 3:27 PM, Andrew Hume wrote: >=20 > the actual configuration of Lions=E2=80=99 PDP 11/40 was > 128 Kbytes of core memory,=20 > a DJ11 terminal multiplexor and=20 > three RK05 disc units each,=20 >=20 > but note that because of the way the machines were bought, > and because of addressing weirdness (the top 8KB were memory-mapped to = I/O registers), > Lions=E2=80=99 PDP actually had 112KB of main memory. > the PDP 11/40 had 18bits of address space, so while processes were = limited > to 64KB, the system could have had 256KB.