<> they can only because the '450 has a silo of 4 bytes < <The 16540 has only one byte buffer. Oops mixed it op with a compatable hybrid... < <> and the 550 it's either 16 or 32 bytes. < <The 16550 has 4 bytes, and the 16650 has (I think) 16 bytes. Some fo the super integration chips (FDC, IDE, 2SIO and parallel) have extended that to 32. <Have you modified the kernel? Normally disks will preempt ttys. This is RT-11 and RSTS and I don't have a UNIX on the q-buss -11s. I could recompile RT but, Qbus, interrupt priority is based on position relative to the cpu, In mine its memory, serial io and then all the rest in order of decreasing speed. Allison Received: (from major@localhost) by minnie.cs.adfa.oz.au (8.8.5/8.8.5) id SAA25982 for pups-liszt; Sun, 1 Feb 1998 18:47:10 +1100 (EST) X-Authentication-Warning: minnie.cs.adfa.oz.au: major set sender to owner-pups(a)minnie.cs.adfa.oz.au using -f Received: from henry.cs.adfa.oz.au (henry.cs.adfa.oz.au [131.236.21.158]) by minnie.cs.adfa.oz.au (8.8.5/8.8.5) with ESMTP id SAA25977 for &lt;pups(a)minnie.cs.adfa.oz.au&gt;; Sun, 1 Feb 1998 18:47:04 +1100 (EST) Received: (from wkt@localhost) by henry.cs.adfa.oz.au (8.7.5/8.7.3) id SAA12606 for pups(a)minnie.cs.adfa.oz.au; Sun, 1 Feb 1998 18:47:25 +1100 (EST) From: Warren Toomey &lt;wkt(a)henry.cs.adfa.oz.au&gt; Message-Id: &lt;199802010747.SAA12606(a)henry.cs.adfa.oz.au&gt; Subject: Virtual PDP Tape - update To: pups(a)minnie.cs.adfa.oz.au (PDP Unix Preservation) Date: Sun, 1 Feb 1998 18:47:25 +1100 (EST) Reply-To: wkt(a)cs.adfa.oz.au X-Mailer: ELM [version 2.4ME+ PL22 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-pups(a)minnie.cs.adfa.oz.au Precedence: bulk All, The virtual tape drive seems to be working fine. I've added RL support, so you should be now able to install over a serial line to: RP04, RP05 and RP06 disks. RP03 disks. RK05 disks. RL01 and RL02 disks. Other disk support would require hacking the V7 kernel sources. I've back-ported uncompress to V7, and written a user-mode program to read from the tape, so I'm hoping that once the basic root filesystem is installed, you will be able to do: $ vtget /dev/tty1 5 | uncompress | tar vxf - and pull over compressed tar images. That should speed things up. I will consolidate the documentation, give it a damn good testing with Ersatz 2.0 tomorrow, and then put the whole thing up for ftp at: ftp://minnie.cs.adfa.oz.au/PDP-11/Vtserver I haven't heard from many of those who were `dying' for something like this last year. Hopefully someone will find it useful :-) Cheers, Warren Received: (from major@localhost) by minnie.cs.adfa.oz.au (8.8.5/8.8.5) id OAA28785 for pups-liszt; Mon, 2 Feb 1998 14:44:07 +1100 (EST) X-Authentication-Warning: minnie.cs.adfa.oz.au: major set sender to owner-pups(a)minnie.cs.adfa.oz.au using -f Received: from henry.cs.adfa.oz.au (henry.cs.adfa.oz.au [131.236.21.158]) by minnie.cs.adfa.oz.au (8.8.5/8.8.5) with ESMTP id OAA28780 for &lt;pups(a)minnie.cs.adfa.oz.au&gt;; Mon, 2 Feb 1998 14:44:03 +1100 (EST) Received: (from wkt@localhost) by henry.cs.adfa.oz.au (8.7.5/8.7.3) id OAA23220 for pups(a)minnie.cs.adfa.oz.au; Mon, 2 Feb 1998 14:44:29 +1100 (EST) From: Warren Toomey &lt;wkt(a)henry.cs.adfa.oz.au&gt; Message-Id: &lt;199802020344.OAA23220(a)henry.cs.adfa.oz.au&gt; Subject: First Release of Virt Tape Software To: pups(a)minnie.cs.adfa.oz.au (PDP Unix Preservation) Date: Mon, 2 Feb 1998 14:44:29 +1100 (EST) Reply-To: wkt(a)cs.adfa.oz.au X-Mailer: ELM [version 2.4ME+ PL22 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-pups(a)minnie.cs.adfa.oz.au Precedence: bulk All, Ok, the alpha-cut of the virtual tape drive for installing 7th Edition UNIX onto PDP-11s is available at ftp://minnie.cs.adfa.oz.au/pub/PDP-11/Vtserver It works for RK05s, but I'm getting a `panic: iinit' error for RL02s. This indicates a bad kernel build for the RL02s, something I have to work on. I cannot test the software for RP03/04/05/06 disks, but this should be vanilla V7 and should work with no problems. A couple of people emailed me and said that they would rather get 2.11BSD (again on a PDP-11 with no tape drive). Steven, would you be prepared to add support for the virtual tape drive into 2.11BSD? Only the boot/install code would need to change. Would anyone with RL02s & experience with V7 kernels help me fix the RL02 problems?!! Cheers all, Warren Received: (from major@localhost) by minnie.cs.adfa.oz.au (8.8.5/8.8.5) id JAA01650 for pups-liszt; Tue, 3 Feb 1998 09:03:54 +1100 (EST) X-Authentication-Warning: minnie.cs.adfa.oz.au: major set sender to owner-pups(a)minnie.cs.adfa.oz.au using -f Received: from henry.cs.adfa.oz.au (henry.cs.adfa.oz.au [131.236.21.158]) by minnie.cs.adfa.oz.au (8.8.5/8.8.5) with ESMTP id JAA01645 for &lt;pups(a)minnie.cs.adfa.oz.au&gt;; Tue, 3 Feb 1998 09:03:50 +1100 (EST) Received: (from wkt@localhost) by henry.cs.adfa.oz.au (8.7.5/8.7.3) id JAA24121 for pups(a)minnie.cs.adfa.oz.au; Tue, 3 Feb 1998 09:04:20 +1100 (EST) From: Warren Toomey &lt;wkt(a)henry.cs.adfa.oz.au&gt; Message-Id: &lt;199802022204.JAA24121(a)henry.cs.adfa.oz.au&gt; Subject: Swedish PUPS To: pups(a)minnie.cs.adfa.oz.au (PDP Unix Preservation) Date: Tue, 3 Feb 1998 09:04:20 +1100 (EST) Reply-To: wkt(a)cs.adfa.oz.au X-Mailer: ELM [version 2.4ME+ PL22 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-pups(a)minnie.cs.adfa.oz.au Precedence: bulk Did I send this PDP message on to the list? Warren ----- Forwarded message from beast(a)lintilla2.df.lth.se ----- From: beast(a)lintilla2.df.lth.se Date: Tue, 27 Jan 1998 14:38:52 +0100 Message-Id: &lt;199801271338.OAA07788(a)sylvester.&gt; To: wkt(a)cs.adfa.oz.au Subject: PUPS Membership Hi PDP lovers! My name is Lars Persson and I live in the south of Sweden. I am collecting various flavors of PDP11 systems. Mainly Q-bus based ones. Currently I have one system up running UNIX, namely an 11/23 with IDRIS. IDRIS is roughly V6-ish, btw. I also have in my collection a PDP11/73 with BSD 2.11 but this system is currently suffereing from a defective boot sector on its RD54 and my TK25 has burned to cinders.. Can anybody help? Other more or less workable systems are: 11/34, 11/03, 11/23s-/23PLUS, 11/53, PRO-350, VT103 (the VT100 with a built in Qbus for LSI PDPs) and also several VAXen (uVAX II, 11/730 and various VAX-stations). In my collection I also have much litterature, manuals and engineering drawings of PDP11s, spares, RL02 diskpacks, RK05 diskpacks, RX01/02 floppies and much more. Happy to help anybody who needs it. I have been fiddling with PDP11 computers for a considerable number of years and I have also worked with UNIX and networking for a long long time. =) Regards! /Lars Persson, HARLOSA Computer Center ----- End of forwarded message from beast(a)lintilla2.df.lth.se ----- Received: (from major@localhost) by minnie.cs.adfa.oz.au (8.8.5/8.8.5) id PAA02592 for pups-liszt; Tue, 3 Feb 1998 15:49:37 +1100 (EST) X-Authentication-Warning: minnie.cs.adfa.oz.au: major set sender to owner-pups(a)minnie.cs.adfa.oz.au using -f