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 30514 invoked from network); 27 Feb 2022 07:40:22 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 27 Feb 2022 07:40:22 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id B3F3D9CFC3; Sun, 27 Feb 2022 17:40:18 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 79692944BA; Sun, 27 Feb 2022 17:38:19 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 30931944BA; Sun, 27 Feb 2022 17:38:15 +1000 (AEST) Received: from mercury.lcs.mit.edu (mercury.lcs.mit.edu [18.26.0.122]) by minnie.tuhs.org (Postfix) with ESMTPS id DCC6C93D6E for ; Sun, 27 Feb 2022 17:38:13 +1000 (AEST) Received: by mercury.lcs.mit.edu (Postfix, from userid 11178) id C63E318C083; Sun, 27 Feb 2022 02:38:12 -0500 (EST) To: tuhs@minnie.tuhs.org Message-Id: <20220227073812.C63E318C083@mercury.lcs.mit.edu> Date: Sun, 27 Feb 2022 02:38:12 -0500 (EST) From: jnc@mercury.lcs.mit.edu (Noel Chiappa) Subject: Re: [TUHS] CSR in 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: jnc@mercury.lcs.mit.edu Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" > From: Will Senn > My question is - how did y'all run things - with CSR zero and no kernel > messages ... or with CSR non-zero and kernel messages. On the -11/45 V6+ at MIT, we didn't have a printing terminal on the console, just a VT52. We had a tool at MIT called 'dmesg': http://ana-3.lcs.mit.edu/~jnc/tech/unix/man8/dmesg.8 which made up for that a bit. We normally ran with the CSR set to 173030 - the 'boot in single-user' setting. That's because at one point the machine was in the 9th floor machine room, but the console VT52 was on the 5th floor (where our offices were - the famous print of the GE-645 Multics was on the hallway wall outside mine :-), and I'd added a 'reboot()' system call (nothing fancy, it just jumped to the bootstrap ROM), so we could reboot the machine without going up in the elevator (not if it had crashed, of course). Later on, after we'd done with kernel hacking (adding a network interface, and IP), and the machine stayed up for long periods, we moved the console up next to the machine (since if it crashed, you had to use the front panel to restart it, so you had to be up there anyway); we stayed with the default CSR setting, though. (If it panic'd, you could see the reason why when you went to reboot it.) > Oh, BTW, I know I've seen this noted elsewhere, but I can't remember > where. Maybe at: https://gunkies.org/wiki/UNIX_Sixth_Edition#Distros which discusses it? Noel