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, T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 23414 invoked from network); 18 Jul 2023 02:06:46 -0000 Received: from minnie.tuhs.org (2600:3c01:e000:146::1) by inbox.vuxu.org with ESMTPUTF8; 18 Jul 2023 02:06:46 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 0ECB342A49; Tue, 18 Jul 2023 12:06:41 +1000 (AEST) Received: from lechuck.jsg.id.au (jsg.id.au [193.114.144.202]) by minnie.tuhs.org (Postfix) with ESMTPS id 6333B42A48 for ; Tue, 18 Jul 2023 12:06:27 +1000 (AEST) Received: from largo.jsg.id.au (largo.jsg.id.au [192.168.1.43]) by lechuck.jsg.id.au (OpenSMTPD) with ESMTPS id b3eedbbe (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Tue, 18 Jul 2023 12:06:24 +1000 (AEST) Received: from localhost (largo.jsg.id.au [local]) by largo.jsg.id.au (OpenSMTPD) with ESMTPA id 5913092b; Tue, 18 Jul 2023 12:06:24 +1000 (AEST) Date: Tue, 18 Jul 2023 12:06:24 +1000 From: Jonathan Gray To: Noel Chiappa Message-ID: References: <20230718004946.4ACC518C09B@mercury.lcs.mit.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230718004946.4ACC518C09B@mercury.lcs.mit.edu> Message-ID-Hash: X7GSAGOFGDR6HSW4T74C43A4O3D74J62 X-Message-ID-Hash: X7GSAGOFGDR6HSW4T74C43A4O3D74J62 X-MailFrom: jsg@jsg.id.au X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: tuhs@tuhs.org X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] Re: Research UNIX PDP 11/45 List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Mon, Jul 17, 2023 at 08:49:46PM -0400, Noel Chiappa wrote: > https://minnie.tuhs.org/cgi-bin/utree.pl?file=V4/nsys/dmr/rk.c > > it's only set up to handle one physical controller. But there is this: > > #define JRK 1 /* temp */ > > if (bp->b_dev.d_major==JRK) > d = bp->b_dev.d_minor; > else > d = bp->b_blkno%3; > > so the two different major device entries appear to handle the same disks in > different ways ("d = bp->b_blkno%3" will spread a virtual drive across three > physical drives). "Berkeley's 11/45 was among the first systems that Thompson had encountered that had two disks on the same controller!" Twenty Years of Berkeley Unix https://www.oreilly.com/openbook/opensources/book/kirkmck.html > Memory, it would have been hard to say (UNIX even then sized memory at start > up) but then I found that '11-45' file. I also found a copy of the CACM > version of the UNIX paper: > > https://people.eecs.berkeley.edu/~brewer/cs262/unix.pdf > > which says the machine had 144KB (so they had added 40KB more at that point). > (I seem to recall someone had scanned the SOSP version; I didn't save the > pointer, but if someone knows where it is, it would be interesting to look, > and see what it says - they seemed to update this paper on a regular basis - > the copy included with V6 talks about the -11/70.) tuhs/Applications/Dennis_Tapes/dmr_tapes.tgz dmr_tapes/dmr2/tp/paper/p1 Nov 1973 "The PDP-11/45 on which our UNIX installation is implemented is a 16-bit word (8-bit byte) computer with 104K bytes of core memory; UNIX occupies 42K bytes." tuhs/Documentation/Papers/unix_cacm74.pdf July 1974 "The PDP-11/45 on which our UNIX installation is implemented is a 16-bit word (8-bit byte) computer with 144K bytes of core memory; UNIX occupies 42K bytes." tuhs/Distributions/Research/Dennis_v6/v6doc.tar.gz unix/p1 Jun 1975 "The PDP-11/45 on which our UNIX installation is implemented is a 16-bit word (8-bit byte) computer with 112K bytes of core memory; UNIX occupies 53K bytes." version from the Australian DECUS symposium (August 1977) has the same line as as v6 tuhs/Documentation/Papers/BSTJ/bstj57-6-1905.pdf July/Aug 1978 "The PDP-11/70 on which the Research UNIX system is installed is a 16-bit word (8-bit byte) computer with 768K bytes of core memory; the system kernel occupies 90K bytes about equally divided between code and data tables." v7/usr/doc/cacm/p1 matches bstj