December 2025 - cctalk - classiccmp.org

by Brian L. Stuart

So Santa had his sleigh out for some test drives tonight. For ballast (the real gifts won't be loaded until Wed night), he used a big stack of engineering drawings from the 1940s. Fortunately for us, his "spirited" driving included one turn that was too tight and out flew the drawings, where they landed on my lap. For anyone who's as eager as I am to geek out over 1940s computer design, I share them with you here: http://cs.drexel.edu/~bls96/eniac/drawings/ There are over 900 drawings in the set. Most of these images come from scans of microfilm taken of the patent trial exhibits. There are also about 100 copies that the Smithsonian had imaged and put up on their web site. I've processed them all to approximate something like we remember from our technical drawing classes in college (well those of us old enough to have taken them). The quality varies widely, but a large subset are readable down to the measurements for the panels and the component values in the circuits. If you've read Kathy Kleiman's excellent book (Proving Ground) about the original ENIAC programmers, you may have found yourself wondering what the block diagrams from which they figured out how to program the machine looked like. Well, those are among the drawings here. So feel free to try your hand at figuing out how to program it from them. One subset of the drawings is conspicuous by its absence, the PX-15 series. From what I can tell, those were drawings of a delay line memory unit that was never built. Those drawings were not part of the trial exhibits and were not microfilmed. However, some physical copies do exist, and I am hoping to get back into the archives to scan them at some point in the future. Beyond that, there are a number of drawing numbers that are skipped, and I suspect that these are drawings that do (or did) exist, but were not microfilmed for whatever reason. So if anyone has or comes across any drawings that are not on this list, or better copies of those that are, feel free to send scans my way. For anyone wanting to grab copies of the full set, it should be pretty easy to extract a file name list from the index.html file. I'll leave the sed command for extracting the list as an exercise for the reader. For printing, all of them are sized in the PDF files for 8.5x11 or 11x17 paper. Be warned, printing all of them without duplexing and folding the 11x17s to fit into a normal binder, ends up filling 2 4-inch binders. By the way, if anyone has access to the adapter shown in drawing PX-4-119, I think there's an error in the drawing and I'd like to check to see if either there really is or if I'm missing something. Thanks and have fun, BLS

8 hours, 11 minutes

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DEC VT05 available in Germany

by hupfadekroua

Hi all, there is a DEC VT05 available in Germany. Please look at kleinanzeigen.de and search for DEC VT05. I already talked to the seller and he‘ll ship worldwide. Best

21 hours, 21 minutes

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Re: IBM 2315 Cartridges

by brian＠quarterbyte.com

> No. The only DEC drive that had removable plus fixed on the same spindle > was the RC25. > If I remember correctly it was Diablo that sold an RK05-compatible drive with one fixed platter and one removable cartridge. I encountered it on a PDP 11/34 running Mini Unix and then, hmmm, Unix v<something small>. (Or maybe had to move to a larger disk system when we moved up from Mini Unix. The details have gotten hazy.)

22 hours, 58 minutes

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Computer Collection Dissolution

by Jochen Kunz

Hello. So it is happening. Finally. What a relieve. I am giving away my (almost) entire classic computer collection. Free of charge (almost). But local pickup only due to health reasons. Read: Due to a physical disability I am not able to ship any computers. Location: Kaiserslautern, Germany. Almost because I will keep my beloved SPARCstation 1+, my SGI O2 and a few spare parts for sentimental reasons. I am still tempted to keep a QBus with a LSI11 and MicroVAX III... Anything else has to go. I don't wane make a profit out of it. I want the stuff go into good hands with absolut minimum effort at my side. As compensation I only ask for your help to get rid of some other stuff that has accumulated over the years. (Loads of disk, CDROM and tape drives. Cables, adapters, expansion cards, RAM modules, ... and some junk in my basement. More cables, 14" VGA monitor, glass-TTY, 19" rack mounts, empty boxes, ...) Either you take some of the junk with you, or you help me bring the junk to the nearby recycling center. I don't care, as long as the junk is gone. I may also request your help to rearrange existing or install new furniture in my appartement. (My desk uses the Sun 3/260 as support...) You want it all? Perfect. Rent a moving truck. Come and get it. You just want some pieces? Fine. Come, get what you want and take some junk out of the pile. The more nice stuff you take, the more junk you have to take. (Sounds worse then it is.) Almost complete list of stuff available below. Almost all stuff can be picked up and transported by a singe, strong person. Only a few pieces will require an additional hand, that I can not provide my self due to health reasons. Contact me off list with your machines of interest to get things arranged. Rationale: I haven't done anything with this stuff in 15+ years. After 15 years, I am quite confident that this will not change. I tried to get back into it in 2010 by acquiring a PDP-11/34A. After a few weeks I lost interest and now it is sitting partly disassembled and waiting for repairs. (The PSU bricks need new electrolytic capacitors...) Sitting there for 15 years. Untouched. I haven't really read any postings to this list in 10+ years. I am basically only still subscribed to nag myself to write this email. For me, my machinery is like books that I have read. I had a lot of fun reading those books. I learned a lot out of them. Most important are the people that I got to meet via them. Like this very mailing list and the legendary VAXpower meetings... :-) But now I know all the books. There is nothing new to discover. The books just sit there on shelves, collecting dust. It reached a point where all this stuff is getting in my way to live a happy live. The collection has become an obligation, a burden. Especially as: At the end of 2009 my back broke and I needed an emergency surgery. Now I have to be very careful with lifting and carrying stuff. I don't move anything over maybe 6 kg anymore. (That is 13ish pounds for you imperialists. ;-) ) This is also the reason why I can not ship anything. I am simply not physically able to package the stuff and bring it to the post office without risking breaking my back again. And when my back brakes again, I may end up in a wheelchair. I escaped that just barely when my back broke initially in 2009... Needless to say that this physical damage also caused mental issues. I will not take any risk breaking my body again. Also: I live in an old appartement building. My landlord will renovate the appartement that I rent in late summer 2026. I may move out of this appartement into an other one in spring 2026, so that the appartement is uninhabited during renovation. I will not move all of this stuff to a new appartement. And if I don't move, I wane get rid of the collection anyway. It will ease the renovation process a lot. Anything that is not already gone when the renovation starts, respectively on moving day, will be recycled. If this means the PDP-11/34A goes into the dumpster to be shredded, than it will happen. Machinery: DEC PDP-11/34A + RK05, optionally in low boy 19" rack. Shares a RL02 and a Cypher 9-track Pertec tape drive with the 11/73. Tektronix 4000-something storage tube vector graphics terminal. I think I still have the accompanying Tek printer. Originally part of the 11/34A system. DEC PDP-11/73, the "franken-11" I pieced this together over time in a BA23 desk side box. Runs 2.11BSD. Has 4 MB RAM, 2 x MSCP ESDI disks (IIRC 150 MB each), TK50, RL02, SMD and Pertec adapters. Comes with a 9" 1 GB E-SMD disk. Shares a RL02 and a Cypher 9-track Pertec tape drive with the 11/34A. DEC VAX 4000-300, upgraded to a -400 DEC VAX 4000-200 DEC VT1300 2 x DEC VAXstation 2000 (At least one has patched ROMs to boot SCSI.) DEC VAXstation 3100m76 DEC VAXstation 4000 VLC DEC VAXstation 4000-60 DEC VAXstation 4000-90 DEC MicroVAX 3100-95 DEC DECstation 3100 DEC DECstation 5000-240 DEC AlphaStation 200 4/166 DEC 3000 300x DEC 3000 600 DEC Alpha PWS 500au DEC Alpha DS20E (I don't know for sure. It has no model number on the front. It looks like a DS20E. I have never, ever even powered up this thing.) Tektronix 8560 Multi-User Software Development Unit This is a DEC PDP-11/23 CPU in Tek box. It runs a customized UNIX V7. At my parents place there should still be MicroVAX III MicroVAX 3500. 2 x 9" NEC E-SMD disks, 1 GB Tektronix 4000-something text terminal with storage tube. Additional logistics will be required if you wane retrieve this stuff. IBM PS/2 Modell 95 XP 486 IBM PS/2 80 IBM RS/6000 43P-140 IBM RS/6000 43P-150 IBM RS/6000 44P-170 SGI Indy SGI Octane, SSE GFX, PCI card cage with SCSI and FDDI cards. IIRC 300 MHz R12k and 2 GB RAM. There must be an additional SI or SE graphics somewhere. I run this machine dual headed. This was my main desktop from 2001 to 2006. SGI Personal IRIS, probably a 4D/25, I can't remember. SGI Indigo IIRC R3000 SGI Indigo IIRC R4000 SGI Indigo 2 teal R4000, Extreme GFX SGI Indigo 2 magenta R10k, Impact GFX SGI Octane carcass (Empty main box with front plane, no CPU, GFX, ...) SGI Origin 200 Sun 3/60 Sun 3/60 box with Sun 4/600 board inside, -12V hack for console RS232. Sun 4/110 Sun 3/260 Sun SPARCstation IPX Sun SPARCstation 2 Sun SPARCstation 5 Sun SPARCstation 10 Sun SPARCstation 20 Sun Ultra 1 creator3D Sun Ultra 2 Sun Ultra 5 ("franken 5" build from parts into a PC box.) Sun Ultra 10 Sun Netra X1 Sun Netra T1 Sun Fire V240 Apple Macintosh IIci Apple MacMini G4 Apple PowerMac G5, single 1,8 Ghz. Motorola MVME Type 3200, desktop box, 4 x 6U VME, IIRC MVME162 CPU. Sony NEWS NWS-3410 HP Apollo 400 425t HP 9000 750 (It may be 400s, but IIRC it is a 750.) HP 9000 B2000 Loads of (mostly SCSI) disk, CDROM and tape drives. Cables, adapters, expansion cards, RAM modules, hubs, switches, FDDI concentrator, ... IBM P200 / Sony Trinitron 19" monitor. Does sync on green. I used it with my SGIs. HP LaserJet 4 with JetDirect LAN (The VF-Display is dead, but otherwise works.) 2 x HP Scanjet IIc, one has an Automated Document Feeder. Works great with Impresario from SGI IRIX. Test equipment: Dolch Logic Instruments logic analyzer. IIRC 48 channels @ 300 MHz. HP Digital Storage Oscilloscope 54710 with 3 x 1 GHz / 2 Msamels/s Y-modules. Analog photo gear: Durst Laborator 1000 4"x5" enlarger, table top version. -- tschüss, Jochen

3 days, 17 hours

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Beginning January 2026, all ACM publications and related artifacts in the ACM Digital Library will be made open access.

by Christian Liendo

Dear Members of the Computing Community, We are pleased to share an important milestone for our field. Beginning January 2026, all ACM publications and related artifacts in the ACM Digital Library will be made open access. This change reflects the long-standing and growing call across the global computing community for research to be more accessible, more discoverable, and more reusable. https://dl.acm.org/openaccess

5 days, 4 hours

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[OT] Digikey's project of the week is impressive

by me＠scifidan.com

A dude decided to do a hackodore 64 laptop in the most expensive way possible, but it's a beautiful result. Nice design ethic. I don't typically share youtube links but this one is a nice exception. https://www.youtube.com/embed/H5QQ0ECfwyE I hope this inspires perifractic into doing a c128 laptop after their new fpga64 ships. Daniel sysop | Air & Wave BBS finger | calcmandan(a)bbs.erb.pw

5 days, 11 hours

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IBM 2315 Cartridges

by Kurt Nowak

Hey all - I came across a big box of 12 of these disks which my dad acquired through work back in the 70s, and squirreled them away in the attic after they had copied the data. 4 of them have a broken metal access door. I opened one of the broken ones (in a clean of an environment as possible) to see what was going on inside. It looks like the door is held on by plastic divets that have broken off. They might be able to be repaired with small screws. I have no idea if these are functional or not. I am offering them up for free for anyone that can use them. I'm willing to ship or you pick up in San Diego. Here is a link to photos of them: https://drive.google.com/drive/folders/1wnzqjAtiq44MGU-wDJR-AQdzu-Mkyii8?us… -Kurt

6 days, 18 hours

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Re: Computer Collection Dissolution

by george.batsilas＠bluewin.ch

Hi Jochen I am an SGI collector from CH and am interested in any SGI and also other systems that you can spare. How can I get in touch with you to arrange a pickup in Kaiserslautern? tschüss George

6 days, 23 hours

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VCF Montréal 2026 Tickets on Sale!

by Jeffrey Brace

Les billets pour le VCF Montréal sont en vente dès maintenant! / VCF Montreal tickets on sale now! https://events.humanitix.com/vcfmontreal2026?c=cctalk More info: https://vcfed.org/vcf-montreal/ Jeff Brace

1 week

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Re: VAX and OpenVMS

by Peter Ekstrom

Just to tie a knot on this.... The MV 3100 is working great. I did replace the RZ25 drive with a ZuluSCSI and have it emulating a couple of RZ25s. I have VMS 5.3-1 up and running. I used the licenses from the OS that was running on it. I also have it on my DECnet network with my PDPs. The PSU looks great and the battery is not a problem either. The CDROM drive I got works great in an old Sun 411 enclosure attached to SCSI-B. I haven't used the TZ30 tape drive yet. I am going to see if I can treat the tapes I have to some time in the dryer and see if that helps. I think the surface of the tapes has softened and is leaving residue on the r/w head. I have read of some folks having success with the dryer. We shall see. But for now I am quite happy with it. Thank you everyone for all help and advice! - Peter On Mon, Dec 1, 2025 at 10:30 AM emanuel stiebler <emu(a)e-bbes.com> wrote: > On 2025-11-30 14:53, Peter Ekstrom via cctalk wrote: > > Very interesting thread. I was kinda thinking too that someone running > VMS > > on a machine for hobby use would be too small of a potato to go after. > > Incidentally, what would y'all value a MicroVAX 3100 at? I am looking at > > one on eBay for $550 but am considering making a lower offer. > > Which 3100? > There are some very low performance 3100 at the lower end, and the > best(?) 3100/105 or 3100/95 still fetch some serious money. > > My recommendation is usually the pizza box 4000/vlc ... > Specially, if you don't know what you need it for :) > >

1 week

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