test-drb October 2005

test-drb@ccmp.vtda.org

264 participants
655 discussions

by leeedavison＠yahoo.co.uk

> Interestingly, that info implies that it's the steel strap > around the perimeter of the CRT's face which does the implosion > protection, and that the laminated faceplate is purely an > additional protection against scratches etc. Glass is very strong under compression but not strong under tension, the forces on an unbanded CRT leave the glass on the outside edge of the face under tension as the forces from the air pressure on the back and the front of the envelope are concentrated there. The steel band compresses the whole tube so that no part of the glass is under tension. That said I do have tubes that don't have this band but they are all shallow angle tubes, much less than 60 degrees. > So that article alone suggests that the faceplate isn't there > to stop debris at all The faceplate is there to stop debris, it really doesn't need to be any thicker than the rest of the envelope but is made so that if the envelope fails it will be inside the set that the failure happens. Lee. . ___________________________________________________________ To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre. http://uk.security.yahoo.com

18 years, 12 months

USB Stuff

by Watzman＠neo.rr.com

Re: "I've seen an LED map light that plugs into and gets its power from USB. It seemed to work OK." That's nothing. Computer Geeks is selling a motorized USB "Aquarium" .... a clear plastic "tank" in which motorized fish (or perhaps just a mural of fish) move, powered from a USB port.

18 years, 12 months

480z system disk on ebay

by williams.dan＠gmail.com

Anyone interested in this ? http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=5270170547 Nothing to do with me . Dan

18 years, 12 months

Non-responsive hard drive - help?

by mtapley＠swri.edu

At 16:50 -0500 10/4/05, tony wrote: > > >> Drive *does* make spinning-up and head-seeking noises (once >> per power-up). LED indicating drive attention does flash, *once*, as > >Does it sound as though it's staying spun-up? It doesn't make spin-down >noises I hope. Not until powered down, at which point it makes the noises I'd expect (taking 2-3 times as long to spin down as the fan, for example). >Those 'wings' are heatsink tabs, used to conduct heat away from the >actual chip. It's a standard package for power driver type chips. I would >guess this chip is either the spindle motor or head actuator driver. Thought I was being clever, but Oh Well. >As to whether it should get hot. Well, it is a power device, so it would >get warm. But if it gets too hot to keep your finger on it for any length >of time, then I'd start worrying. The chip may not be faulty of course, >it might be a problem (like a shorted load, or an incorrect drive signal) >elsewhere in the unit. Both the head seek and the platter spin noises are consistent with what I recall from before the failure, so I'll bet that chip is OK. It's warm, but I can keep my finger on it for seconds at a time, with no blisters arising. Started looking for similar drives to mail-order for a controller board-swap. Thanks to all responses so far! Progress about to come to a screeching halt on the project, as I'm about to hit the road again. Sigh. -- - Mark 210-522-6025, temporary cell 240-375-2995

18 years, 12 months

"screen mold"

by dwight.elvey＠amd.com

>From: "Vintage Computer Festival" <vcf at siconic.com> > >On Tue, 4 Oct 2005, Andreas Holz wrote: > >> I'm experiencing some monitors in the last time, mostly, but not only >> from HP, with the effect of some kind of small bubbles or shell-like >> failures in the flront part of the crt-tube. Somewhere I read the >> description of "screen mold". > >Nowadays the consensus is leaning towards a delamination process. > >> Does someone knows this effect, has an explanation of it's source (is it >> really temperature related?) or how to avoid this problem. Some of these >> monitors (esp. of a HP9845) are looking so badly, that I don't dare to >> power on. > >Most likely it is the protective cover over the CRT which is delaminating >from the CRT face. I don't currently know of a way to prevent this. It >seems to happen randomly. > Hi I think it is from evaporation of plasticizers in the layer. As they evaporate over time, the material shrinks. This causes a void. The void provides another path for the plasticizer to evaporate and a local stress point. This forms the stem like channel feature. As time goes on, plasticizer evaporates from the edges of the channels. This causes new stems to radiate outward. This makes the typical fern leaf look. I would guess the biggest difference between different manufactures is either a different material or different sealing of the edges. The fogging of the material is most likely moisture from the air. Dwight

18 years, 12 months

Cleaning Copper Contacts?

by rigdonj＠cfl.rr.com

At 04:36 PM 10/3/05 -0700, you wrote: > > >If the connector is gold plated, you should not need to clean them. If you >are having green, then the gold is a very thin plate, Not necessary. Gold is very porous and acids and the like penetrate it easily and corrode the copper underneath and the corrosion products then travel back through the gold and appear on the surface of the contact. It's not uncommon to find gold plated contacts with nothing left but a thin sheet of gold. All the copper was corroded away leaving nothing but the gold. Corrosion like this is common on the HP calculators and it's what happens when you plate gold directly over copper. The proper way to do it is to plate nickel or other non-porous material over the copper and then plate gold over that. The nickel will prevent the acids and oxygen from penetrating the surface and corroding the copper. FWIW on OLD cars they used to plate steel with copper, then nickel and then chrome plate over that. Plating like that will easily last 40 years (speaking from experience). Joe or an amalgam of >copper and gold ( and possibly other metals) Have you tried a dremel tool >with a dry polishing wheel - no solvent or compound? Use it lightly. This >has worked wonders for me though it does take patience. >

18 years, 12 months

Non-responsive hard drive - help?

by pete＠dunnington.plus.com

On Oct 3 2005, 13:28, Mark Tapley wrote: > Broken component is the hard drive from a La Cie Tsunami > external enclosure. Drive is a Quantum Prodrive LPS, 240 MB capacity, > 1) Is the HA13476 expected to be pretty warm in use? > > 2) What is an HA13476? Is it unobtanium Don't know... > 3) Anyone have a matching drive that I could get at reasonably low > cost to try exchanging controller boards? ...and too far away... > 4) Any suggestions for further trouble-shooting and/or repairing? ...but I can offer some possible comfort, in that I have swapped boards between Quantum Prodrive LPSs of that sort of size successfully, even when the drives participating in the swap have not been the same size as each other. Might need to swap the ROM as well, but the ones I've seen are all socketed. -- Pete Peter Turnbull Network Manager University of York

18 years, 12 months

IBM 5028

by hardware＠ees1s0.engr.ccny.cuny.edu

I intend to return the 5028 to working condition. If, even in its terrible cosmetic condition, the 5028 is needed as part of somebody's IBM collection, I will trade it for a regular ASR33. But shipping from NYC would be expensive and quite possibly destructive. -kurt

18 years, 12 months

FF: Apple Mac (Milton Keynes, UK)

by julesrichardsonuk＠yahoo.co.uk

I have no idea exactly what model (could LCII screens be used with anything other than an LCII?), but we have more Apple hardware than we need right now - if anyone wants to chase this one up, then contact Mavis Beard direct on mavis.beard at btinternet.com Seems like a good way of getting a stock Apple machine in nice condition at the very least. <<< I wonder whether you can help please - I wish to find a home for the following computer which I now no longer need and I have been advised to contact yourselves: Apple Mac Computer with Claris Works Mackintosh LCII Monitor Mouse Keyboard Modem Printer Stylewriter II This is in very good condition, in fact hardly used so hope you can take it on board. >>>

18 years, 12 months

QUICKALERT OSBORNE HOFFMAN CENTRAL STATION RCVR AIM-65

by rigdonj＠cfl.rr.com

Did you guys and gals see this? Ebay Item number: 6002377010 Joe

18 years, 12 months

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test-drb October 2005