test-drb July 2005

test-drb@ccmp.vtda.org

257 participants
628 discussions

PRIMOS (was Re: Found in a spam... (ontopic, really!!!)

by aek＠bitsavers.org

> Has anyone archived PRIMOS install media (for any of their machines)? > PR1MEs themselves are hard enough to come by, but OS tapes seem to have > totally vanished... Hope so... I know several ex-Prime employees, still have lunch with a few frequently and they say they have tapes.... -- If you have your drive going, these would be a good thing to archive. Any tech docs on the hardware would help the guy working on the simulator, also.

18 years, 12 months

PRIMOS (was Re: Found in a spam... (ontopic, really!!!)

by aek＠bitsavers.org

> Has anyone archived PRIMOS install media (for any of their machines)? yes. A little bird told me a few weeks ago about someone trying to get PRIMOS running in simulation.

18 years, 12 months

Of rats and the Commodore 64...

by bpope＠wordstock.com

Here are a few pictures of a Commodore 64 still in use today: http://madscientistroom.org/drupal/Retro/C64/Rats Someonle else posted recently about Spam + classic computing... I just received some spam that said "Rats drown in WordStar"... That's all I see of the message in elm. Cheers, Bryan

18 years, 12 months

PDP 11/35 front panel plexi wanted

by wacarder＠earthlink.net

Does anyone have a good front panel plexi for a PDP-11/35 21" chassis? I recently acquired an 11/35 with a blue front panel. Today I did a minor amount of tinkering and got this 11/35 up and running, booting RT11, XXDP+, and RSTS/E from RL02 packs. Now I want to switch out the front panel so that it will look like the standard 11/35. I have a spare front panel plexi for a 21" chassis, but it says 11/40. I also have a spare 11/35 front panel plexi, but it is for the 10 1/2" chassis. Is there anyone out there who would like to trade me a 21" chassis 11/35 plexi for my 10 1/2" 11/35 plexi? The keyhole is in a different position on these two varieties of front panel. If anyone has a PDP-11/35 front panel plexi for a 21" chassis they would like to sell or trade, please contact me off-list at wacarder at usit.net. Thanks, Ashley

18 years, 12 months

Decitek Reader and Remix punch

by rigdonj＠cfl.rr.com

At 12:04 PM 7/22/05 -0400, you wrote: >Today I obtained a Genrad 1797 programming station. It consists of a PDP-8a, 3 RK05s, a Decitek paper tape reader, a Remix paper tape punch, and a Genrad interface unit. Also with the system is a DecWriter III and 3 RK05 16 sector packs, as well as an alignment pack. He threw in alignment pack? Nice! It's probably worth $300 by itself. > >I have not begun to study the system yet. Quick questions: > >1) The Decitek reader appears to have a serial (EIA / RS232) interface. Can someone point me to some documentaion on how this might be interfaced to a PDP-11? > >2) Same question as #1, but for the Remix paper tape punch Can you see what cards they're connected to? > >3) What were these GenRad programming stations used for? They were very big, very expensive and very sophistaced circuit card test stations. I looked at one at Thom's and it was far larger than your complete PDP-8. > >4) What is the purpose of the GenRad 1795-3010 interface unit? Probably a TTL interface. Unfortunately I didn't keep any of the GR docs. There were just too many of them and I would have had to leave some^H^H^H^H MORE of the DEC stuff to bring them. I have some info for you about the RK-05s in Melbourne. I'll e-mail you directly about them. Joe > >BTW, the system looks to be in good condition and was said to be running before it was decomssioned just a few months ago. Once I get a 30A 4-prong receptacle installed for it, I'll fire it up and see what it's all about. There is a boot pack for it. > >Any help or pointers on where to find information on the Decitek reader, Remix punch, and GenRad equipment in general would be greatly appreciated. > >Thanks, >Ashley >

18 years, 12 months

I'm King of the DSD-440s!

by rigdonj＠cfl.rr.com

I went to Melbourne today to pickup some DEC rack slides for Jay. I didn't find much at the first place that I stopped except a pile of HP stuff. I called jay to see if he was interested in any of it and was just poking around while I was talking to him on the phone. THEN I looked over in a basket of scrap and spotted two DSD-440s! I grabbed both of them of course. Next I headed to the place that had the rack slides. When I got there I spotted this <http://www.classiccmp.org/hp/Stuff%20Found%20at%20Rogers/front.jpg>. I thought it was some kind of DEC floppy drive so I wasn't too excited till I looked in the back ans saw this <http://www.classiccmp.org/hp/Stuff%20Found%20at%20Rogers/FD%20inside.jpg>. Wahoo! Another DSD-440! I brought all three home of course. That makes SIX sitting in my living room! (Yeah, the OL isn't too happy!) I picked up a CRAP LOAD of DEC rack slides. Yeah, Jay, you'll be happy <http://www.classiccmp.org/hp/Stuff%20Found%20at%20Rogers/Slides.jpg>. I also spotted this <http://www.classiccmp.org/hp/Stuff%20Found%20at%20Rogers/>. Warning there are some BIG pictures there. I wanted to capture as much detail as possible. It's a PDP-11/44 LOADED with cards and with a MPI 9448 cartridge drive and it >had< a DSD-440 drive it as well. I also captured these two beauties <http://www.classiccmp.org/hp/Stuff%20Found%20at%20Rogers/drives.jpg>. Joe

18 years, 12 months

Repairing IC pins

by dave04a＠dunfield.com

>Hi folks, > Does anyone know of a way to repair IC pins that have been broken off at >the point where they leave the IC casing? I've got a couple of chips with >missing pins here and was just wondering if it was possible... In a couple of cases where I've absolutely had to repair an IC with a pin broken off right at the casing, I have done the following: Scrape the plastic down a bit with a detail knife to expose slightly more metal. Tin the exposed metal without applying heat for too long ... Put the IC in the socket, and place a suitable "new" pin, or even a piece of suitably sized wire into the socket in place of the missing pin, cut it to just slightly more than meet the exposed metal. Using suitable tiny tools, bend it over to touch the tinned metal. It is important that it be in the right place without needing force to hold it there. Tack it into place with a quick application of iron and solder. Such a repair has little mechanical strength, which is why you do it "in place" - If you ever have to remove the chip again, chances are the replaced pin will break off at the solder joint. I also wouldn't trust it for high longevity in a rough environment (or even a normal one), although I have had a couple such repairs running for quite some time, allowing machines to be run which would otherwise be "waiting on parts" ... Regards, -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html

18 years, 12 months

Apple II vs Apple II+

by marvin＠rain.org

In cleaning out one of the closets, I ran across a number of Apple II+ machines and what I suspect might be an Apple II. The top cover has the Apple II logo on one of the machines and it looks identical to the Apple II+. Is there an easy way I can tell the difference between the two machines? If I indeed have the Apple II, then all I am looking for will be the Bell & Howell Black Apple II+ to complete the Apple II series of machines through the Apple //e enhanced.

18 years, 12 months

Repairing IC pins

by dwight.elvey＠amd.com

>From: "Paul Koning" <pkoning at equallogic.com> > >>>>>> "Dwight" == Dwight K Elvey <dwight.elvey at amd.com> writes: > > Dwight> ... I have a number of RAM IC that are > Dwight> gradually failing because they have the iron cored pins. I > Dwight> guess these were cheaper ... > >Probably not. Chances are the pin is actually made of Kovar or some Hi Paul No, these are made with iron. It clings solidly to a magnet. The cores are definitely form one of the iron oxides. These are on plastic and not ceramic packages. Not many materials cling that well to a magnet, other than iron that I know of. Dwight

18 years, 12 months

11/34a help

by dundas＠caltech.edu

Recently recovered a /34a with the following configuration: /34a-DE with KY11-LB M9301-YF terminator/boot M7856 DL11-W RK11-D (with RK05F and RK05 drives) M7846 (with dual RX01) and the following that I'm not at all familiar with: Jorway Model 411 CAMAC? Looks like a Massbus cable going into it. Applied Magnetics Trendata memory board MM-135?: <http://dundas-mac.caltech.edu/~dundas/retro/DEC%20Docs/Board%20Scans/Unibus…> ACT quad board that appears to be 4 serial ports; it has 4x40-pin Bergs that sound link a Quadralink (?) that was mentioned recently on the list. Any information on these last three items would be greatly appreciated. I'm more familiar with LSI CPUs and /70 or /84 machines so the /34 should be fun. Thanks, John

18 years, 12 months

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test-drb July 2005