test-drb July 2004

test-drb@ccmp.vtda.org

259 participants
518 discussions

by Watzman＠neo.rr.com

Processor Technology 1978 stuff on E-Bay, SOL-20 and two Helios II's: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5109086247 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5109095872 [disclaimer, I am the seller, so this falls into the "shameless plug" category]

21 years

Monitor deflection magnets; what to do when one falls out & breaks?

by brad＠heeltoe.com

Hi, I have an old B&W "specialty" monitor which recently stopped working. In the process of moving it around (to/from repair place) I noticed a little black "tube magnet" dropping out when I took the cover off. At the time I didn't think much of it (those in the know can chuckle now). So, after a bout of replacing bad caps with no luck, I eventually broke down and replaced the deflection board and the monitor sprang to life. Much joy. (note: "specialty" = designed for a specific computer with a special ECL video connection and has no standard connector or interface. and no schematics) So, monitor is working. I proceed to adjust the H & V size, linearity, etc... I notice that the bottom and sides will square up nicely but the top edge has a large "dip" in the middle. No amount of trimmer fiddling will fix this. light goes off. "found" tube magnet is part of yoke assembly. So, I notice where the missing magnet came from. Naturally it's on the top side of the yoke assembly. But - the "tube" has broken into 3 pieces (it was broke when I found it. honest). I carefully glued it back together (no glue in the joints, however) and replaced it. This helped a little but did not cure the problem. [note to reader: I never took that fields course. I know nothing of magnets.] So, - is a broken magnet pushed back together not as good as a whole magnet? (strength wise) - can I get a new magnet somewhere? - is there anything special about these magnets? - do normal monitor repair guys just have a box of these laying around? - does this sort of thing happen all the time? -brad

21 years

simh and rt11 primer.

by eric＠redrouteone.net

I was using boot rl0. That is what I get for doing things when I am tired. I did not use PUTR to create the disk file just at. That is likely the source of my problem. This should get me a ways down the road. Eric

21 years

Anybody want to get together at VCF East?

by wh.sudbrink＠verizon.net

I'm there, at the Marriott. Email me directly if you want to get together for dinner or something. Also, any exhibitors know what we're supposed to do tomorrow? Bill S.

21 years

Booting a VAXstation 4000 VLC off the hobbyist boot CD-ROM

by pete＠dunnington.u-net.com

On Jul 15, 13:39, David Betz wrote: > > Thanks for your suggestions! > > On Jul 15, 2004, at 1:03 PM, Antonio Carlini wrote: > > B/R5:10000000 DKA400: > > > > (that's 1 followed by 7 zeroes). > > > > I tried this and ultimately got the same "DKA400: is offline" message. > I guess it doesn't like this CD-ROM drive either. This is the last one > I have to try. Maybe I can find someone with one at VCF East tomorrow. I've not tried to boot a VAXstation 4000 from CD-ROM, but I've had no problem with lots of other classic machines using older Toshiba drives. Almost all modern (newer than about mid-90s) drives understand the SCSI command to set the blocksize to 512 bytes in software, but older machines don't know to do that. I keep a couple of Toshibas just for that reason; XM3201, XM3301 and XM3401 at least have a couple of pairs of half-moon solder pads, near the SCSI connector, normally linked for 2048-byte blocks, but you can cut the tracks between one or both to set 512-byte blocks. The three different 512-byte settings are supposed to be for Sun, SGI, and Intergraph, but I've never noticed much difference. OTOH, I have a couple of Hitachis and an NEC which can be set to 512-byte blocks, and they don't work too well (the Hitachis in particular are very slow and generate lots of errors), so apparently not all CD-ROM drives are created equal. -- Pete Peter Turnbull Network Manager University of York

21 years

simh and rt11 primer.

by eric＠redrouteone.net

Hello, I have wanted a PDP11 for years but currently do not have the space for one so I have decided to do the next best thing use simh. I have downloaded simh and the rt11 disk image but I am kind of stuck on where to go. Does anyone know of any sites or documents available online that cover configuration of simh and the installation and use of rt11. I have done some messing around and have managed to boot the rt11 image by using the commands at rl0 rtv53_rl.dsk at rl1 eric_pdp11_rt11.dsk <- This is a file that I intend to do my install to. Is that wrong? Boot rl1. I choose the automatic option but then it wants me to mount a disk in dl1 so that it can backup the media. I try to attach dl1 but I get an error non existent device. If try to create the disk during the install the install just errors out and dies. Any help with this will be most appreciated. Eric

21 years

Another good day at the auction and Free Stuff

by tponsford＠theriver.com

Hi All, Another great day at the auction. My $30 bought me: 5-Dec Alpha 4/233's 2-Dec MVII's all filled with qbus cards, no scsi (this time) but a almost brand new RD54!! in one. 1 5' computer rack and a HP 9000/300 complete with: -7959 S SCSI controller and disk - 98730 S 32bit Davinci Graphics subsystem -most of the cables, etc The 9000 was given to me by a guy who won the lot it came in but only wanted the peecee stuff. If anybody wants to give it a good home it's yours for the taking; It's on a rolling rack and is about the same size as the MVII's Cheers Tom -- --- Please do not read this sig. If you have read this far, please unread back to the beginning.

21 years

Monitor deflection magnets; what to do when one falls out & breaks?

by dwight.elvey＠amd.com

Hi It should be noted that when broken, these cheap magnets will lose some of their magnetism that can not be recovered by simply gluing the piece together. As was mentioned, finding others on scrap units is the easiest. Positioning these is an art. They never seem to do what one expects so take your time at locating the best location and orientation. It most likely will not be the same as it was originally. Watch out for the anode lead and wear eye protection, any time you are working on he monitor with the cover off. Dwight >From: "John Lawson" <jpl15(a)panix.com> > > > These are cylindrical, low-gauss ferrite magnets called 'trimming >magnets' or 'pincushion magnets'. A lot of cheaper CRT devices use 'em to >tweak the display. They're a pain in the butt, especially the ones near >the front of the CRT that gradually get demagnetized with each power-on >degauss cycle. > > They are sometimes available at larger 'real' hardware stores (in the >US) like True Value, etc. > > Or, as was wisely suggested, cannibalize them from another junk tube. > > > Chees > > >John > > > >

21 years

Monitor deflection magnets; what to do when one falls out & breaks?

by melamy＠earthlink.net

these are indeed magnets and were usually the dirt cheap variety. They were set in place at the factory to "trim" the beam to overcome mechanical deviations in the gun and deflection assemblies internal to the crt. They were not all that powerful. The best source of replacement would be another old monitor that you can take the magnets out of. best regards, Steve Thatcher -----Original Message----- From: Brad Parker <brad(a)heeltoe.com> Sent: Jul 15, 2004 11:54 AM To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk(a)classiccmp.org> Subject: Re: Monitor deflection magnets; what to do when one falls out & breaks? Paul Koning wrote: > >It's probably not a magnet, but rather a ferrite core. You'd know the >difference putting the pieces together -- if you feel no attraction or >repulsion, it's not a permanent magnet. Interesting. The pieces do attract. Are ferrite cores magnetic? (I would think a ferrite core would have wires wrapped around it) These magnets are not connected to the wired internal yoke assembly - they are glued to a "collar" which is close to the back of the tube. The collar is round but the magnets are glued to make a square - I assume this helps make the image square. (or not :-) The magnets on the two sides are symmetric as are the top and bottom. Both top and sides have two "tube magnets" but ared spaced slightly differently. The sides have two magnets side by side with no gap. The top and bottom have two magnets side by side with a a 1/4" gap. I can see where the glue was holding the magnet. That's where I put it back. I assume the poles should be aligned, i.e. the poles of the two magnets should be the same, producing a larger overall field (I presume) >As for the problem, I wonder if the issue is that the core is in the >wrong spot. It's part of the deflection magnetics assembly, and if >it's misplaced then you'd certainly get problems like you describe. >Take a look at the corresponding piece at the bottom of the yoke. I >would expect things to be symmetric. The fact that the thing fell out >suggests that it may have been out of position, and when you pushed it >back in you may not have gotten it back where it actually belongs. Well, it fell out onto the floor when I took the enclosure off :-) -brad

21 years

Old software files needed

by classiccmp＠vintage-computer.com

I got this via email today: ---[ Snip ]--- For a magazine review of a file-viewing program, I?m trying to find data files in a variety of old formats that would be used in testing. Would you have any you could send or know someone who would have such files? I?m interested in files from word processor, spreadsheet, database, presentation, and graphics programs. The data files I?m looking for include those from programs such as WordStar, DisplayWrite, Enable, PFS:Write, MultiMate, dBase, FoxBase, Paradox, Lotus 1-2-3, Quattro Pro, Freelance, Harvard Graphics, and the like. Thanks for your help. Gary Berline ---[ Snip ]--- Please contact Gary directly at Gary_BerlineNOSPAM(a)NOSPAMziffdavis.com - removing the obvious. Erik Klein www.vintage-computer.com www.vintage-computer.com/vcforum The Vintage Computer Forum

21 years

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test-drb July 2004