test-drb February 2000

test-drb@ccmp.vtda.org

162 participants
585 discussions

Electrolytic capacitors and other picture postcards.

by bill＠chipware.com

Well, my OSI C3D is currently non-functional. Here's what happened: I've been testing and repairing a number of OSI 48-pin bus cards using the C3. This has required a large number of power cycles. Also, several cards caused the PS fuse (2A, 250 volt, glass cartridge) to blow. In each case, this problem was corrected by replacing the electrolytic caps on the offending board. OSI used 47 microfarad, 16 volt ecaps (ecaps... is this a good abbreviation? I'm getting tired of typing "electrolytic") pretty much exclusively. I could not find a source for these, so I used 47mf, 36 volt ecaps as replacements. This seemed to work OK. I finished working on the other cards and tried to bring up the machine with just the original cards. The fuse blew. Grrr... I pulled all of the cards, replaced the fuse and tried them one at a time. Sure enough, the CPU card (the model 510, triple CPU card with 6800, 6502 and 8080) was the culprit. I replaced its two ecaps as per above. It came up, rebooted once OK, started to get flakey and now won't come up at all. Is my understanding of ecaps correct? That is, as long as the capacitance is correct, the voltage is greater or equal to the required load and it is installed "right way around" it should be OK? There is so much logic on this board, a lot of it 8Txx, I hope I haven't blown a chip. It would take me a month to find it and who knows if I could get a replacement. Thanks, Bill Sudbrink

24 years, 10 months

site for old Mac/Lisa SW

by Marion.Bates＠dartmouth.edu

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24 years, 10 months

HP 3000 MPE V: notes on Y2K Safe release

by ss＠allegro.com

Hi, If you have a Classic HP 3000 (any two-digit model #), and if you received the "Y2K Safe" release of MPE recently, and if you haven't installed it yet, I have some notes that you should find interesting. (If you didn't get your Y2K Safe MPE V (which was free!), email Allan Hertling at allan_hertling(a)hp.com) 0. 3P Patches? -------------- If your goal is to get Release 40 installed, you don't need to bother with the 3P patches you may have received. I simply installed 3P, and then did the Turbo Update to Release 40, and then installed the Release 40 patches. 1. TUINSTAL Y2K bug ------------------- The Turbo Update mechanism has a Y2K bug in it. TUINSTAL builds the file TUSYSDMP, which builds a new SL and tries to create a SYSDUMP tape with a partial backup. If run today (8 Feb 2000), the partial backup would be specified incorrectly as 2/8/0 ... and STORE (which is used by SYSDUMP) doesn't accept a single digit year. Workarounds: 1) change system date to 1999-12-31 before running TUINSTAL (note: you may have to purge TUSYSDMP if it's already been built) or 2) edit TUSLINFO prior to running TUINSTAL and change the line towards the end with "$$/$$/$$" to "02/04/00" (or some such) ...note: I haven't tested to see if TUNINSTALL will complain if it can't find the $$/$$/$$ line. 2. Release 40 Patches --------------------- There are 7 patches on the Release 40 patch tape. Accompanying the tape is a list of the patches ... these are also the names of the files to stream to install each patch! Notes: 1) Be sure to restore the patches into PATCH.TELESUP! (They're on the tape as @.PATCH40.TELESUP) 2) Don't rely on setting LIMIT to 1! Each job has a ";HIPRI", and each builds a new file called "PATCH1JJ" (or some such), and streams it with HIPRI! I.e., it you attempt to minimize your time at the console by streaming all the jobs at once, you'll regret it! (Been there, done that :) 3) INFDVA7B and TRVDVA8B both replace RAPID000.PUB.SYS ... the latter with a bigger file than the former. My *guess* is that TRVDVA8B should be installed second. 4) BBRDVA1B, RPRDVB0A, and SIMANY5B each build a new SYSDUMP tape and require a coldload. I streamed the other 5 jobs first (one at a time), then did: stream BBRDVA1B COLDLOAD from the tape stream RPRDVB0A COLDLOAD from the tape stream SIMANY5B COLDLOAD from the tape did a manual SYSDUMP with date 0 and "@.@.@" If you're ambitious, you could combine the three patches into one job (with one sysdump/coldload) 3. Disk Space ------------- I didn't want to risk my existing disks/system, so I bought a used Coyote (HP 6000 670H ... 670 MB?), and setup a single disk system. After installing just the 3P FOS tape, FREE5 reported 2,348,785 available sectors (573 MB) ... before installing the SUBSYS tape! After going to Release 40, installing the subsystems, and installing the Release 40 patches, I have about 1,600,000 sectors free (383 MB). Stan Stan Sieler sieler(a)allegro.com www.allegro.com/sieler/wanted/index.html www.allegro.com/sieler

24 years, 10 months

Poor contact repair (was: Re: The pure *hell* of restoring a PDP-8/Sdesktop.

by dylanb＠sympatico.ca

<snip> >I'll have to try that. I guess, everyone has their own way of fixing bad >solder contacts. I've used the method I described over the past 16 years on <snip> I DID NOT MEAN BAD SOLDER CONTACTS... I meant poor contacts between a backplane and a board. I'm still having "bad solder joint" flashbacks after restoring my second PDP-8/S.... I hope they go away in a few days ;-) john PDP-8 and other rare mini computers http://www.pdp8.com > >john > >PDP-8 and other rare mini computers > >http://www.pdp8.com > >> >> > >

24 years, 10 months

The pure *hell* of restoring a PDP-8/S desktop.

by allisonp＠world.std.com

<silicone grease and still functioning with out a <hitch after 25 years. Their contact resistance still <measures less then the original dry contact resistance. <I put silicone grease on the contacts of the USART <socket, in my Poly88, back in 1979, to fix a flaky contact. Perfectly reasonable thing to do to protect the metals from contact with air and resulting corrosion. Allison

24 years, 10 months

[CC] Clarifying my "Wanted" posting.

by netsurfer_x1＠hotmail.com

First off, here is my original posting: >I am looking for a copy of the old Macintosh speech synthesizer program >called "Smooth Talker" from First Byte. I had this program >on a floppy >that my electronics teacher gave to me last year, but >the floppy has since >worn out & I have been searching *everywhere* >for a copy, but to no avail. >If you have a copy, *do not* send me a >disk image, as my Mac (original Mac >upgraded to Mac Plus specs.) >does not recognize them at all. I must ask, >however, that it come on >an 800K floppy, 400K is not enough space! > >I am looking for a driver for aforementioned Macintosh for an Apple Color >Stylewriter 2400. I don't want that printer to be reduced to >dust magnet >status! Clarification: I am looking for the aforementioned drivers/programs *on a disk*, *NOT* as a disk image! Disk images are totally useless to me, & my Mac does not like them *at all*. I tried to make a disk image once, but it didn't work. ____________________________________________________________ David Vohs, Digital Archaeologist & Computer Historian. Computer Collection: "Triumph": Commodore 64C, 1802, Double FDD, GeoRam 512, Okimate 20. "Leela": Macintosh 128 (Plus upgrade), Nova SCSI HDD, Imagewriter II. "Delorean": TI-99/4A. "Monolith": Apple Macintosh Portable. ____________________________________________________________ ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

24 years, 10 months

Poor contact repair (was: Re: The pure *hell* of restoring a PDP-8/S desktop.

by dylanb＠sympatico.ca

<snip> >Why does every one think I'm talking about petroleum >grease. Many high power connectors are protected with >silicone grease and still functioning with out a >hitch after 25 years. Their contact resistance still >measures less then the original dry contact resistance. >I put silicone grease on the contacts of the USART >socket, in my Poly88, back in 1979, to fix a flaky contact. >I have had no reason since then to add more. I used >the Poly88 just last week. If I'm addicted, it is just >for new applications. >Dwight I'll have to try that. I guess, everyone has their own way of fixing bad solder contacts. I've used the method I described over the past 16 years on dozens of old mini computers... never had one come back because of problems caused from the chemicals I use... john PDP-8 and other rare mini computers http://www.pdp8.com > >

24 years, 10 months

The pure *hell* of restoring a PDP-8/S desktop.

by dylanb＠sympatico.ca

-----Original Message----- From: Mike <dogas(a)leading.net> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Tuesday, February 08, 2000 4:43 PM Subject: Re: The pure *hell* of restoring a PDP-8/S desktop. >>From: John B <dylanb(a)sympatico.ca> >> >> <big snip of transistorized pdp-8 restoration tips> > >That was great. I dont even have an 8 of any kind but I enjoyed reading the >pointers and learned alot with that one. Thanks. It's one of the reasons I >like this list (and I hope one day to have to dig that note up from an >archive to help a machine that's near... ;) Keep it up! > You're welcome, and I really hope you find one. Out of the dozens of different mini computers I have restored for collectors, I have never found one as fun to restore as the PDP-8/S. What else can you run hundreds of different programs and languages on only 1001 transistors and 73 light bulbs? (and pretty quick too ;-) ).... Oh, and using "general purpose" Flip Chips?There are only 3 custom boards inside the 8/S: the front panel switches, the front panel lights, and the power monitor flip chip (W506). Even the core memory used general purpose slicers/diff. amps found in DF32 DISC and Magtape units! (okay, So Saul was desperate to use easily accessible Flip Chips... ). Well, back to the grind... I have to restore some PDP-11/20 minis now :-( Hope you find I *really* cool mini! john PDP-8 and other rare mini computers http://www.pdp8.com >Cheers >- Mike: dogas(a)leading.net > > > > >

24 years, 10 months

The pure *hell* of restoring a PDP-8/S desktop.

by dogas＠leading.net

>From: John B <dylanb(a)sympatico.ca> > > <big snip of transistorized pdp-8 restoration tips> That was great. I dont even have an 8 of any kind but I enjoyed reading the pointers and learned alot with that one. Thanks. It's one of the reasons I like this list (and I hope one day to have to dig that note up from an archive to help a machine that's near... ;) Keep it up! Cheers - Mike: dogas(a)leading.net

24 years, 10 months

free machines in Woodbridge VA

by yakowenk＠cs.unc.edu

Hey all, Once upon a time, I wrote asking for volunteers to rescue some machines in Woodbridge VA. There was a PDP-11/34 that got rescued, but there is still a big pile up there that is headed for the scrap heap unless somebody picks it up. Of course, the remainder is mostly PC crap^H^H^H^Hstuff, but some of it is old enough to be of possible interest. Let me know if you're interested. (The guy dumping this stuff really would like it to find good homes, but he still doesn't want to be overrun by dozens of requests, so I'm still trying to coordinate things.) Without further ado, here's the list brought back by our recon guy, Al Corda <applause>. Some of it may be gone by now, but most is probably still there: ] As of today (1/10/00) items of interest I have identified ] include the following: ] ] 3 or 4 Gen-u-ine DEC VT100s (some with keyboards! :-) ] ] A number of IBM XTs (Yeh, I know, but I included them for ] completeness :-) ] A number of IBM ATs (Just plain ATs, no AT370s or AT3270s (so far)) ] ] 2 Compaq Plus Luggables ] ] A bunch of LaserWriter II printers in various states of repair ] A bunch of Spinwriter printers of various makes. ] ] 2 Photocopiers (1 Canon Npf-270, one Xerox (not certain of model)) ] ] A bunch of PC monitors, mostly monochrome or CGA (no VGA as far as I ] could tell) ] ] A couple of cases of various PC software from the early 90's ] (stuff like RBASE, etc.) ] ] 3 or 4 large _HEAVY_ units that on brief inspection strike me as ] UPS (or line conditioner) units. No manufacturers markings were ] obvious (but I wasn't going to try to turn one over. My back is ] worth more to me than any UPS.) ] ] Piles of office telephones, Old modems, Various unidentifiable ] electronic assemblies of dubious origin, Boxes and boxes of cables, ] wire, etc. Cheers, Bill. PS. I've been _way_ behind on answering e-mail lately, so remind me in your reply that this is time-sensitive, and that machines will get crushed if I nap. :-/

24 years, 10 months

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test-drb February 2000