Alumina Substrate

Yes. It was a disaster. I had a Multibus-I-Board made in this technology. Vias cracking open and sometimes closing again on a hourly base. The right thing you need to debug a multiprcessor with lots of DRAMS and dual ports. We junked it. No wonder that it's gone.

regards, Gerhard

Clark boards weren't Multiwire, they were regular multilayer, but with thin traces. They had a zillion power and ground planes, whereas Multiwire only has one. The ones I had in my lab were from a 3090--they were almost 1/2 inch thick, and required (iirc) +3 and -1V supplies, both at well over 1000 amps. The bus bars were made of ~30x30x5 mm copper angle.

Cheers,

Phil Hobbs

I don't have XM. But some day it'll show up on a web stream.

No, it was the accent. They learn Oxford English over there. Not the real English as it is spoken here in Kahleefohniah :-)

In fact, we never had cable, satellite or any of that. Never missed it. We usually watch the news and other than that shoot pool, play cards, go for a walk etc. The radio does run sometimes but there's also an old piano, an organ and a guitar.

If the electricity went for a long period of time (why it did with the previuos governor) we'd still have decent food, entertainment and fun.

--
Regards, Joerg

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It's sort of fun, once in a while, to design for sheer performance, and damn the cost.

John

Sounds just like press-fit and wire wrap.

--
Regards, Joerg

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shipping

It already is, but you still have to pay for it. ;-)

You mean New Yawk. ...or more precisely, Broookln.

My family was like that when I was growing up. We didn't have a TV until '65, and then a B&W with rabbit ears.

I did OK during long power outages, but after three days the meat in the freezer didn't do so well. :-( We had a gas grill, so at least some of the meat didn't go bad. It got kinda iffy keeping the house above freezing a couple of times, but no pipes burst.

--
Keith

shipping

Well, let them find others who give them they credit card numbers. Not me.

Best to get a wood stove. That's what we did, but mostly to get out from underneath those hyper-inflationary energy prices. I have no idea how some neighbors will keep their house warm next winter from a financial point of view.

--
Regards, Joerg

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shipping

CC numbers are easy. I understand not wanting to pay for that which is "free", but fear of credit cards I don't understand at all.

again.

I had a wood stove when I was in VT (not in NY). It worked quite well. Didn't help the meat in the freezer much though. ;-) Following the birds sounds like a better idea. Actually, the power was quite reliable in VT. Our area just missed the big ice storm a few years back (a couple of hundred feet too high).

--
Keith

Press fit, maybe. Wire wrap, no. Early IDC contacts. Wires glued to board.

Yeah, I remember a vivid discussion here about wire wrap. Some folks thought it to be top notch stuff, others like me had seen too much grief from it. And in our case it was not because of amateur work, it was certified techs trained and tested by wrap gun mfgs, Cooper IIRC. After that dreaded era we made sure the wrap guns were chucked deep, deep down into the garbage container, never to see the light of the day again ;-)

But the topper was press-fit. Their sales dude was doing his spiel in front of EEs and their managers. It went something like "We guarantee

99.95% contact reliability". So here's me, pounding away on the calculator and then raising my hand. "On this backplane that would mean three contacts would statistically be bad. Could you tell us which ones that would be?" At this point one of the managers declared the meeting over.

--
Regards, Joerg

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6000 contacts on one backplane? Best regards, Spehro Pefhany

--
"it\'s the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

I'm doing some work on a system with 5200 contacts _per_connector_.

Cheers,

Phil Hobbs

What, if anything, did you spend your economic stimulus check on, Joerg? :-)

The largest one I dealt with had over 7000. About 25 slot and each had 3 DIN connectors (9U). Each DIN connector had 96 pins. Even that wasn't enough and they were mulling a migration to 5-row DIN. That would have brought it to well over 10000.

--
Regards, Joerg

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Didn't get one. I received a nice letter from one investment that their tax info ain't ready yet. So had to file an extension. Harumph!

--
Regards, Joerg

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actual

dim,

I

nearly

there

Multi-wire was used for featuring, ECs, and overflows.

--
Keith

WireWrap was great stuff. ...and yes, it did matter who did it

*AND* the tools they used. GardnerDenver machines did a superb job.

I designed one WireWrapped board with 4000 wires. Memory busses tend to have lotsa wires. ;-) My technician was thrilled - really (just bought a house and all OT was much appreciated).

--
Keith

Spehro Pefhany a écrit :

I did one board with five 250 pins connectors, 4 boards per backplane.

Fortunately, most of that was for getting ***really low*** inductance and lots of contacts were paralleled (and interleaved).

--
Thanks,
Fred.

"Andrey" wrote in news:ZYednYsnnp2nZd_VnZ2dnUVZ snipped-for-privacy@posted.uniservecommunica tions:

May be late on this...but:

Type "alumina" in "Find Products" box on upper left side of

Kenpage.