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, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 26412 invoked from network); 27 Sep 2020 20:51:14 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 27 Sep 2020 20:51:14 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id E73EF9CEFE; Mon, 28 Sep 2020 06:51:06 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 7B69D9CEBF; Mon, 28 Sep 2020 06:50:27 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id EE48B9CEBF; Mon, 28 Sep 2020 06:50:23 +1000 (AEST) Received: from mercury.lcs.mit.edu (mercury.lcs.mit.edu [18.26.0.122]) by minnie.tuhs.org (Postfix) with ESMTPS id 55A059CEB9 for ; Mon, 28 Sep 2020 06:50:23 +1000 (AEST) Received: by mercury.lcs.mit.edu (Postfix, from userid 11178) id 2D91918C0C8; Sun, 27 Sep 2020 16:50:22 -0400 (EDT) To: tuhs@minnie.tuhs.org Message-Id: <20200927205022.2D91918C0C8@mercury.lcs.mit.edu> Date: Sun, 27 Sep 2020 16:50:22 -0400 (EDT) From: jnc@mercury.lcs.mit.edu (Noel Chiappa) Subject: Re: [TUHS] Fwd: Choice of Unix for 11/03 and 11/23+ Systems 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: Paul Riley > I also have a DEC 256KB board, but I doubt I could use it on the > '03. Yes, DEC 256KB boards are what's called Q22, and those don't seem to work with LSI-11's; not even CPU ODT works. I just tried a 256KB MSV11-L with an LSI-11, and it definitely doesn't work; the MSV11-P is definitely a Q22 board, and so probably also won't work. What the Q22 means is that early in the lifetime of the QBUS, it only had 18 address line - so-called Q18. (Technially the LII-11 used only 16 address lines, so it's actually Q16.) DEC latter snarfed some of the 'unused' pins, and made them QDAL18-21. So boards that use those pins for QDAL18-21 are 'Q22' boards. My theory on what the problem is is that the LSI-11 uses some of those pins for other things - I think the 'run' light, IIRC. So that confuses Q22 memory. If one tries to use one with an LSI-11, the machine is totally dead - not even ODT. It doesn't do any harm, though; unplug the Q22 memory, and plug in a Q18 card like an MSV11-D, and it'll be fine. If you need memory for the LSI-11, MSV11-D boards are pretty common on eBait, for not much. They tend to be flaky, though; sometimes they come back to life if you leave them sit for a bit after you plug them in. > I believe the [memory] board is non-DEC. Well, if it's Q22 it won't work either. Both that and the DEC board should work in the /23, though. (If you have the part number on the memory chips, a little arithmetic should give you the board size. 256K and up are generallly Q22; if you have a manual for that card it might say.) I'm still working with Mini-Unix; it's very fragile. When I got it running, the first thing I tried to do was changle the line editing characters (since my normal ones are burned into ROM). Alas, in stock V6, DEL is hard-wired to be 'interrupt process', so I can't just 'stty [mumble]', I have to rebuild the kernel to change that. Not a problem, necessarily - but I edited tty.h and said 'cc -c tty.c', and it crashed and re-started - and roached the disk. So I'm still trying to make progress. I might have mis-configured the simulator, I'll see. Noel