test-drb August 2018

test-drb@ccmp.vtda.org

112 participants
131 discussions

IP address classes vs CIDR (was Re: Reviving ARPAnet)

by jnc＠mercury.lcs.mit.edu

> From: Eric Smith > which would respond to ARP requests for non-local addresses and reply > with the router's MAC address (on that interface), specifically in > order to make classful-only hosts work on a CIDR network. Yeah, Proxy ARP (an early RFC here: https://www.rfc-editor.org/rfc/rfc1027.txt but IIRC it was people at CMU who first came up with the idea; this RFC is >from people at UT-Austin, documenting it) was originally done to support subnetting (see https://www.rfc-editor.org/rfc/rfc917.txt for more) when it was first introduced - for hosts for which people didn't have the source, but needed to attach it to a subnetted network. Subnetting was a stage before CIDR (which took subnetting and Carl-Herbert Rokitansky's 'supernetting' and mushed them together). Noel

5 years, 5 months

Which Operating System for my DCC-116 E / Entrex 480 / Nixdorf 620 / Data General Nova 1200 clone ?

by cube1＠charter.net

On 10/4/2017 3:33 PM, Dominique Carlier via cctech wrote: > Hi all > > I start here another topic concerning my research about a new Operating > System for my freshly restored DCC-116 E. > > http://www.zeltrax.com/classiccmp_forum/second_boot/04.jpg > http://www.zeltrax.com/classiccmp_forum/second_boot/02.jpg > > I originally intended to install RDOS on my machine but it seems very > difficult to find the files needed to make a system installation tape. > FIRST: If you have drawings for the DCC, please let me know. I have two of them (long in storage in the house, but they ran when I pulled them from their Unitote/Regitel rack a couple of *decades* ago. There is an RDOS - disk images, available at: http://simh.trailing-edge.com/software.html (Top entry in the list) It is about a 2.5MB disk image. I suggest that you might download SimH and that image, configure SimH as a straight Nova (rather than a /3 or /4) and see if it runs that image OK. If so, there you go! Beyond that, I *might* be able to help, but it will depend on what the status of copyright is on what I have, and whether your system can even run what I do have. I am looking into the copyright part of it - that may take a week or two. (This is something I needed to to anyway). In the meantime: Do you have a way to *write* a tape image? I have an AWS format image of an RDOS starter system. Note, however, that the label on the RDOS starter image I have suggests it may only be appropriate for a NOVA 3 or NOVA 4, so it might not run on your system. So, I'd have to take some time to boot it and try and set up a system for a straight Nova. As this would take several hours, I'm not keen on doing that unless you know that one from SimH will not work for you. I also have some OS and compiler DG floppy images, if you have a DG-compatible floppy setup. Several different operating systems there. Same issue: one would have to see how many are compatible with a straight Nova. I have images of the floppies. Diagnostics for DG systems are notoriously difficult to find. I have a few, in listing format. JRJ

5 years, 6 months

VMS Mosaic 4.2

by spectre＠floodgap.com

I'm worried that VMS Mosaic 4.2 is lost since WVNET's VAX systems are no longer operational, and it was stored on their FTP server (not somewhere that the Wayback Machine got to). I only have an old version of 3.6 and a diff of 4.2. Does anyone have the original copy of 4.2? It was named MOSAIC4_2.ZIP. What I've got is here: gopher://gopher.floodgap.com/1/gopher/clients/vms/ -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- The world is coming to an end. Log off now. --------------------------------

5 years, 7 months

Dilog DQ604 RL01 / RL02 emulation on ST506/ST412 disk.

by mattislind＠gmail.com

I unearthed some old TU58 tapes that luckily was readable (after carefully replacing the tension band) It resulted in two RT11 V4 images with two versions of the formatter program. One is bootable and the other not. http://storage.datormuseum.se/u/96935524/Datormusuem/Dilog/DQ604/sq604c.dsk http://storage.datormuseum.se/u/96935524/Datormusuem/Dilog/DQ604/sq604d.dsk I tried to run the formatter program in Simh: .run sq604C.sav TEST AND FORMAT DQ604 DISK SYSTEM (REV C.) DRIVE FORMATS AS RL01 UNIT (5.24 MB) SWITCH 3 CLOSED ENABLES BOOTSTRAP THERE ARE 17 PHYSICAL SECTORS PER TRACK (2) ALTERNATE CYLINDERS MAY BE ASSIGNED PER UNIT THE INTERLACE FACTORS ARE TWO OR THREE TO ONE DATA BUFFER ERROR USE PROCEED (P) TO REPEAT TEST HALT instruction, PC: 006312 (BR 6202) .RUN SQ604D TEST AND FORMAT DQ604 DISK SYSTEM (REV C.) DRIVE FORMATS AS RL02 UNIT (10.48 MB) SWITCH 3 CLOSED ENABLES BOOTSTRAP THERE ARE 17 PHYSICAL SECTORS PER TRACK (4) ALTERNATE CYLINDERS MAY BE ASSIGNED PER UNIT THE INTERLACE FACTORS ARE TWO OR THREE TO ONE DATA BUFFER ERROR USE PROCEED (P) TO REPEAT TEST HALT instruction, PC: 006312 (BR 6202) So it appears to be runnable. I also found the manual for the board and scanned it: http://storage.datormuseum.se/u/96935524/Datormusuem/Dilog/DQ604/DQ604.pdf Now the next step is to see if this can make the DQ604 board I have working with David Gessweins MFM emulator.

5 years, 7 months

Novapalooza in 2 months...

by Flash688＠flying-disk.com

Bruce Ray <Bruce at Wild-Hare.com> wrote: > Really, the Nova is 50? Yup - so join us in celebrating the personal and > technical impact of this youngster.. I always found it amusing that Data General's computers were named after transitory phenomena: Nova, Supernova, Eclipse. Of course, in the grand scale of things, we all are. :-( Alan

5 years, 7 months

Thicknet/10base5 Test Segment: The Cable is In!

by systems.glitch＠gmail.com

All, A few months ago, I mentioned one of my suppliers had Belden 89880 thicknet Ethernet cable. Well, last week I finally made it down to his warehouse and picked it up! The final bits for a test segment came in today, so I set up a little link between my SPARCstation 10 and DEChub 90: https://imgur.com/a/GDUR36j Anyone interested in cable can email me directly (please change the subject line, it'll get binned into my cctalk folder otherwise). I can provide any level of "kit" from just the cable to fully ready to go. I do have a very few NOS Cabletron ST-500-01 transceiver/non-intrusive tap kits as well. Thanks, Jonathan

5 years, 7 months

Lear Sielger keyboard for parts or repair

by sales＠elecplus.com

https://www.elecshopper.com/lear-siegler-adm-11-keyboard-for-parts-or-repair .html Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-370-3239 cell sales at elecplus.com --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

5 years, 7 months

Computer Design & Automation (CDA), Simpact, EXCLAN

by useddec＠gmail.com

Does anybody know anything about these companies or their products? If you have any interest in them, please contact me off list. Thanks, Paul

5 years, 7 months

DEC PDP 11 RK05 DEC custom (?) bootstrap board

by jnc＠mercury.lcs.mit.edu

> From: Paul Koning > the original ROM array bootstrap supports not just RK05 but also RF11, > RC11, and TC11 in just 16 words of code. Ah, the days of devices that just did what they were told without trying to be effing rocket scientists about it! (Yeah, yeah, I know _some_ of the things the later ones did, you had to be close to the hardware to do them, but too often they had this 'we're from the device manufacturer, and we're here to help you' thing going. I used to have a photocopy of a great article in a trade rag which explained why complex devices were a Bad Idea; maybe I can find it, if anyone's interested.) Noel

5 years, 7 months

DEC PDP 11 RK05 DEC custom (?) bootstrap board

by jnc＠mercury.lcs.mit.edu

> From: Bill Degnan > I am curious how I'd attempt to use one of these. Any thoughts? I'd start by dumping and disassembling. (If you need something to find out where in memory they are, I have a register discovery program that sweeps the I/O page and lists all locations that respond. It's probably 173xxx though, that's the DEC-allocated spare for ROM.) Noel

5 years, 7 months

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test-drb August 2018