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 autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 30004 invoked from network); 11 Jul 2022 23:47:44 -0000 Received: from minnie.tuhs.org (50.116.15.146) by inbox.vuxu.org with ESMTPUTF8; 11 Jul 2022 23:47:44 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 70ED940BCB; Tue, 12 Jul 2022 09:47:35 +1000 (AEST) Received: from mercury.lcs.mit.edu (mercury.lcs.mit.edu [18.26.0.122]) by minnie.tuhs.org (Postfix) with ESMTPS id 3935C40BCA for ; Tue, 12 Jul 2022 09:47:30 +1000 (AEST) Received: by mercury.lcs.mit.edu (Postfix, from userid 11178) id 2E9F418C096; Mon, 11 Jul 2022 19:47:29 -0400 (EDT) To: tuhs@tuhs.org Message-Id: <20220711234729.2E9F418C096@mercury.lcs.mit.edu> Date: Mon, 11 Jul 2022 19:47:29 -0400 (EDT) From: jnc@mercury.lcs.mit.edu (Noel Chiappa) Message-ID-Hash: SHTB4ZUJMILTG5XETI4GLIXG3TPXBGPB X-Message-ID-Hash: SHTB4ZUJMILTG5XETI4GLIXG3TPXBGPB X-MailFrom: jnc@mercury.lcs.mit.edu X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-tuhs.tuhs.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: jnc@mercury.lcs.mit.edu X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] Re: LSX issues and musing List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: > From: Paul Ruizendaal > Note that LSX only holds one process in core and swaps other processes > (NPROC = 3) out to floppy. It reportedly took several hours for the > Terak to self-compile LSX from source. If one is working in a simulator, and not a real hardware PDP-11, there's a 'trick' one can use to make life a lot easier - for MINI-UNIX, at least; I'll comment on LSX below. As I report in the MINI-UNIX Computer History Wiki article: "MINI-UNIX uses the same file system as V6; this allows MINI-UNIX packs to be 'mounted' on V6 systems (either real, or simulated), which is very convenient for working on them." So just spin up a V6 in the simulator, mount the LSX/MINI-UNIX pack, and away you go. The V6 toolchain can be used to compile/link kernels; to link user commands one will need to import the LSX/MINI-UNIX loader (which, since V6 is source compatible with LSX/MINI-UNIX, is trivial). LSX is potentially more complex, as it supports _two different_ file system formats: the standard V6 one, and a 'contiguous' one which is very similar to the V6 one (rdwri.c has no conditionals on CONTIG; not so alloc.c, though), but is not fully compatible. So non-contiguous LSX file systems can be mounted under V6, but not contiguous ones. Noel