test-drb

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101090 discussions

by kurtkilgor＠geocities.com

I found a service manual for Motorola M1000 and M2000 series CRTs. It's photocopied, so I'm not sure if it's complete. It's 18 pages long, copyrighted 1979. Anyone want it?

27 years, 10 months

Need TK50 part

by CLASSICCMP＠trailing-edge.com

>Anybody have a junker TK50 with the plastic tape leader still intact? Or, >does anyone have a NOS part? I would like to buy that part to repair my drive. Part number 74-28268-01, $1.00 each from DECDirect (1-800-Digital). A valuable resource is Digital's Assisted Services catalog search; see http://www.digital.com/info/DAS-Catalog/ -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927

27 years, 10 months

MICRO magazine (6502 related), who knows?

by franke＠sbs.de

> In particular I was reviewing my MICRO magazines (that > deal with the KIM, PET, and various 6502 systems). Coincidence - I just did the same - I took the years 1978 to 1981 with me on a busines trip to have something to read ... I hate this evenings in dump hotels ind small cities (like Paderborn) where they close everything at sundown. > I noticed that the latest copy I have is issue #18. I was > wondering if anyone knew if there were issues beyond > this or if the name of the magazine changed into something > else and I'm just not making the connection? No, they continued, but the quality improved (at least they took more expensive paper). > By the way, in the range of issues #1-18, I am missing > issues #15 & #16. I do however have duplicates of some > of the other issues. If anyone has duplicates of those two > issues, in good shape, and you're interested in trading, > one-for-one, let me know which issues you need and I'll > see if that's one of the ones that I have duplicates of. I will have a look, but this might take some times, since the duplicates are stored at another place. Servus hans -- Ich denke, also bin ich, also gut HRK

27 years, 10 months

Need TK50 part

by cfandt＠netsync.net

Anybody have a junker TK50 with the plastic tape leader still intact? Or, does anyone have a NOS part? I would like to buy that part to repair my drive. Mine has broken on one side of the position aperature through which the photodiode detects its position. Looks like it has been broken awhile as the tips of the break are a bit rounded with wear from the previous owner continuing to use it (probably never knew it was broken). I don't want to take a chance with it breaking on me while most of a tape is wound up on the takeup spool! Thanks, Chris -- -- Christian Fandt, Electronic/Electrical Historian Jamestown, NY USA cfandt(a)netsync.net Member of Antique Wireless Association URL: http://www.ggw.org/freenet/a/awa/

27 years, 10 months

MICRO magazine (6502 related), who knows?

by franke＠sbs.de

>> Coincidence - I just did the same - I took the years 1978 >> to 1981 with me on a busines trip to have something to >> read ... I hate this evenings in dump hotels ind small >> cities (like Paderborn) where they close everything at >> sundown. > So how was the Heinz Nixdorf Museum? Haven't been there this time, but it's nice, althrough my kind of computer museum would be a bit more on the variety of the 70s and 80s focused. Also the HNF Computer Museum is a _bit_ company specific (ok, not as much as the Tupperware Museum). Son't get me wrong, it is still VERY impressive and the most comprehensive of all existing Computer/Information Technology museums in the world (at least compared to everything I have seen until now). And compared to the computer department of the Deutsches Museum, all displays are finished in an usefull way (As you might have noticed, I'm still mad about the displays at the Deutsches Museum). Servus Hans -- Ich denke, also bin ich, also gut HRK

27 years, 10 months

HV Testing (was:Re: Newbie's got a dead 386)

by Philip.Belben＠pgen.com

> Another one - How do you test supplies and various heater controls that have > to float at 8Kv? I.E.: their common point is at 8Kv. Especially when they > are intermittent and you can't tell without the HT on exactly when it is > acting up. VERY carefully float your meter at kV and be very sure you don't > touch the meter and don't do like I did and get to near the leads while > operating the instrument while waiting for the intermittent to act up. An > 8Kv @ 5ma with 1ppm stability supply burns holes on the way in and out. In > the arm and out the finger. I'd recommend: 1. Get one of those rubber holsters for the meter and allow only the holster to touch the equipment. 2. Make some test leads out of EHT wire. The sort of stuff that's used for the anodes of CRTs and things. Maplin used to sell it (haven't checked recently), rated at 25 kV, and I'm sure other suppliers do too. 3. Failing no. 2, car engine HT leads may be useable, but most of them are quite rsistive, so check the calibration! Philip.

27 years, 10 months

11/34A/RK07 not booting. Help wanted

by CLASSICCMP＠trailing-edge.com

>This time it's the PDP-11/34A system. I was able to get it checked out and >lit up okay. It has the Programmers Console (KY11-LB) and an M9312 >Bootstrap/Terminator module plus RK611 and UDA50 drive interfaces. >Switch 2 is OFF on the 9312 therefore, registers printout onscreen and the >system prompt (@ in this case) appears after CNTL/BOOT keys are >simultaneously pressed. Seems okay so far. However, the 11/34-11/34A user's >manual says the prompt should be a '$' (?). Hmm - "$" is what I've always seen with the 11/34A ROM's. Is it possible that you aren't running the standard 11/34A ROM's? What are the DEC ROM numbers on your 9312? The part numbers will be of the frm 23-nnnA9, where "nnn"=752 for the RK06/07 bootstrap. Sometimes the "23-" is left off. But the register printout is correct... >Upon trying to boot the thing I am instructed to simply type DM onto the >terminal and the 11/34A will boot off the RK07 #0. Well, nothing happens. Does the DM echo? What if you type some nonsense characters - like YY? Tim. (shoppa(a)trailing-edge.com)

27 years, 10 months

Newbie's got a dead 386

by geoffrob＠stmarks.pp.catholic.edu.au

-----Original Message----- From: Tony Duell <ard(a)p850ug1.demon.co.uk> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Thursday, 19 November 1998 9:14 Subject: Re: Newbie's got a dead 386 >> footnote: My then boss had "borrowed" the isolation transformer it was >> plugged in to while I was working on it, without telling me. (!) > >Had anyone done that to me, they would have been on the wrong end of a >suitable LART as soon as I had picked myself up... On topic, I've tinkered with a number of monitors, and some really old ICL Terminals that we maintained for a small company in town that had some strange system. They had some interesting fault modes. (Circuit diagrams were non-existant of course) Ok, I'll bite, what in heck is a LART. I've seen this in NANAE but have no idea what it means in this context. I should also mention that when I got home that afternoon, after I realized just how close I came, I made a quiet phone call to the Dept of Labour and Industry, suggesting that this person was running what was effectively : 1) a sweat shop (we were on piece rates) 2) had people working on mains/high voltage equipment without proper safeguards. What annoyed me the most was that there was 1 ELCB in the whole place. Guess who's bench had it. Yep. The boss. He got a surprise visit the following week from a surly little inspector who went through the place like a dose of salts. Not sure how much it cost him in the end, but I know it hurt. I got 4 months back pay and some public holiday money paid. We got ELCB's for all the work benches and 2 isolated outlets per bench for hot chassis stuff. (We'd been asking for this for MONTHS, and were always told, nah, just be careful, you'll be right.) Cheers Geoff Roberts Computer Systems Manager Saint Marks College Port Pirie South Australia. My ICQ# is 1970476 Ph. 61-411-623-978 (Mobile) 61-8-8633-0619 (Home) 61-8-8633-8834 (Work-Direct) 61-8-8633-0104 (Fax)

27 years, 10 months

Newbie's got a dead 386

by dburrows＠netpath.net

> >_Every_ shock I've had has been my own fault for being an idiot. And in >most cases an ELCB wouldn't have helped at all... > It sure would not have helped with one of the worst ones I had. 1900Vdc Electron mult. supply that appeared to have failed (instrument symptoms). Hooked up meter (rated for 2Kvdc) turned on supply, walked behind instrument to read meter, it read approx 40V - the way it usually fails. Figured the supply was dead so why go all the way around the instrument again (40+ foot obstacle course) to shut off the supply. I went to disconnect probes and found out the supply was not dead but the meter was dead. Took about 2 days for the cramps to quit. Another one - How do you test supplies and various heater controls that have to float at 8Kv? I.E.: their common point is at 8Kv. Especially when they are intermittent and you can't tell without the HT on exactly when it is acting up. VERY carefully float your meter at kV and be very sure you don't touch the meter and don't do like I did and get to near the leads while operating the instrument while waiting for the intermittent to act up. An 8Kv @ 5ma with 1ppm stability supply burns holes on the way in and out. In the arm and out the finger. Dan

27 years, 10 months

Nixdorf was Re: MICRO magazine (6502 related), who know

by franke＠sbs.de

>> Hey, speaking of Nixdorf. I have a Nixdorf LK-3000 "computer". It looks >> more like a calculator. Does anyone know anything about these? It has an >> "Information Module" in it about the Summer Olympics. > Cool! Another one! I have an LK-3000, with the Appointment Book > module and a Word-translation Module (German-English, > Spanish-English) and the instructions, etc... still works nicely. I > tried Nixdorf's site, but of course, the little LK is paleolithic > now.... > Anyone have any amplifying data on these? Herr Franke perhaps? They have been somewhat popular over here as translators in the early 80's - somewhat because the price was at least 50% more than any other device in this class. It was a try of Nixdorf to get some hold with consumer products. No, I found no actual data in our archives, but since this product was canceled long before SIEMENS bought NIXDORF, no information may ever have been added. But I startet some search aktivities. This might take some time. Gruss Hans -- Ich denke, also bin ich, also gut HRK

27 years, 10 months

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