test-drb September 2000

test-drb@ccmp.vtda.org

156 participants
405 discussions

by agraham＠ccat.co.uk

> I know that the CRT in a Mac+ is a pretty standard 9" mono > CRT, and that there's nothing odd about the pin configuration or operating > voltages. I suspect the SE's CRT is similar, but I've never had the > chance to pull one of those machines to bits. I'll do it then, and compare the numbers and boards etc, and check apple-history to make sure the resolutions were the same, which I think they were. > Incidentally, if you had 2 dead SEs and broke one of the CRTs, what > happened to the other CRT? It's not common for them to fail > electrically, although I guess it can happen. If the vacuum is still in the > CRT and the heater shows continuity (pins 3 and 4 on the B7G base) then > it's likely you'll get some kind of picture. The good old british postal service 'happened' to the other CRT. They dropped it when it was being transported and snapped the wee glass guide off the back, as well as doing some internal scraping damage with the HD carrier since it wasn't fastened in properly; I had a spare case, drive and CRT so a transplant should've been really simple! Duh. cheers!

25 years, 1 month

Halon dumps: a data point

by CLASSICCMP＠trailing-edge.com

>>Moderately good news: Halon dumps aren't instantly fatal. >It can very nearly be. > >It's an oxygen displacer and non combustable in itself and non >posionous but it's not oxygen! It can be lethal due to oxygen >deprevation. What makes it fairly safe like you saw is that >it's quite heavy compared to air and hungs the floor. The air handlers also helped in removing the halon from the room. As I understand it, during a "normal" (electronically-triggered) Halon dump, the air handlers would have been cut off to maximize the effectiveness of the Halon. In fact, I've heard that Halon's density makes it more dangerous than if it didn't stratify. Unconscious folks, unfortunately, tend to have their noses only an inch or two from the floor... (Did I mention that my office is two floors *below* operations?) > Those that didn't leave were in my estimation quite foolish. These guys (and gals) take their jobs *very* seriously. They aren't going to let anything like the lack of oxygen get in their way! Tim.

25 years, 1 month

OT: reply-to essay

by pete＠dunnington.u-net.com

On Sep 13, 17:08, Joe wrote: > At 10:50 AM 9/13/00 -0500, you wrote: > >In Eudora 4.3, when I hit reply, I get: > > > > At 02:59 PM 9/12/00 -0700, you wrote: > > > >and when I hit Reply to All, I get: > > > > At 02:59 PM 9/12/00 -0700, Sellam Ismail wrote: > > > >which I like better, but it's addressed to classiccmp(a)classiccmp.org twice. > > > >- John > > > > I have Eudora 3.0.1 and it does the same thing. I wonder why? Probably because in many systems like Eudora, "reply to all" replies to all the addresses in the "To:" line and the sender. The "Reply-to:" takes precedence over the "From:" and is set to "classiccmp(a)classiccmp.org", and the "To:" was also set to "classiccmp(a)classiccmp.org", it gets sent twice, and Eudora is too dumb to scan for duplicates. -- Pete Peter Turnbull Dept. of Computer Science University of York

25 years, 1 month

Halon dumps: a data point

by CLASSICCMP＠trailing-edge.com

>> DC area") we had a memorable incident in Operations Control when >> someone (with undoubtedly good intentions) unscrewed the >> solenoid controlling the valve and dumped - without warning - >> 2500 pounds of Halon 1301 into the room in just a few >> seconds. (Operations is a *big* room. It was fitted with eight >> giant red tanks of Halon.) >So where were you in all this? I was in a computer room (aka "concrete bunker") about 50 feet under Operations, swapping around a pair of Bell 212A-style modems. I had just been in Operations about five minutes earlier... When the halon dumped, the building fire alarm was set off (I think automatically) and we bugged out within maybe 15-20 seconds. Tim.

25 years, 1 month

RCS/RI fleamarket and open house

by aw288＠osfn.org

This is a reminder that the Retrocomputing Society of Rhode Island, Inc., will be holding a much needed flea market this Saturday, at our Millspace in Providence, RI. See our page at www.osfn.org/rcs for directions and details. What is going? Mostly small computer stuff - lots of home computers and micros, maybe a few *nix workstations. Conditions vary greatly! Prices will be rock bottom, as we need to clear out the room for more BIG machines. We have no list - rather the list will be formulated as we pick thru the stuff. The usual bunch will be around, and any and all are invited to stick around for dinner and beer. William Donzelli

25 years, 1 month

am9519a

by dburrows＠netpath.net

>>I beat you for once. I found my 1985 AMD book and I am already scanning >it. > > >OH, a race. Anywho being able to scan it for him is good. I have the >scanner >but not tonight. Bed beckons. That is not what I meant. It amazes me how you and several others on this list can come up with so much good info at the drop of a hat. Bed beckons here but I have several more things to finish for customers tonight. Dan

25 years, 1 month

Halon dumps: a data point

by ajp166＠bellatlantic.net

>Moderately good news: Halon dumps aren't instantly fatal. It can very nearly be. It's an oxygen displacer and non combustable in itself and non posionous but it's not oxygen! It can be lethal due to oxygen deprevation. What makes it fairly safe like you saw is that it's quite heavy compared to air and hungs the floor. Those that didn't leave were in my estimation quite foolish. Many years ago one of the halon similars (freon12) was spilled in a room I was working in, roughly 35 gallons of it due to a valve left open. I was quite blue when I was dragged out of the room as it had displaced all the air and only the fact that I'd been under the HEPA curtain doing work (also why I didn't initially notice it) there was outside make up fresh air added or I'd have been hospital fodder or worse. Freon and halon are related as florinated or halogenated hydrocarbons and both are low boiling point, heavy compared to air and non combustable. They are also both oxygen displacents makeing them dangerous in closed rooms and effective for fire control (both as a mild cooant and removing oxygen) while fairly inert. I'm sure there are varients of R134A in use or similar still used. Allison

25 years, 1 month

am9519a

by dburrows＠netpath.net

I beat you for once. I found my 1985 AMD book and I am already scanning it. I also have it in the 1984 IC master. Dan -----Original Message----- From: ajp166 <ajp166(a)bellatlantic.net> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Thursday, September 14, 2000 9:43 PM Subject: Re: am9519a >It's a much better version of what the 8259 should be. >I'd have to find my 1983 AMD databook for more. > >Allison > >-----Original Message----- >From: emanuel stiebler <emu(a)ecubics.com> >To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> >Date: Thursday, September 14, 2000 9:19 PM >Subject: am9519a > > >>Hi, >>Anybody here has an am9519a datasheet (amd interrupt controller) ? >>copies ? scans ? pdf file ? >> >>thanks a lot, >>emanuel >>

25 years, 1 month

Altair Emulator enhancements - progress report - questions

by ajp166＠bellatlantic.net

From: Ethan Dicks <ethan_dicks(a)yahoo.com> >If anyone needs COM5025 chips, please contact me. Given my rate of >consumption, I have several lifetimes worth. Use them to make FDCs or serial mag tape systems. I have a handfull of them too. Allison

25 years, 1 month

OT: reply-to essay

by cmcmanis＠mcmanis.com

A good read: http://www.unicom.com/pw/reply-to-harmful.html Makes a lot of points that I agree with :-) --Chuck [I apologize in advance for the thirty-eleven messages this may or may not spawn.]

25 years, 1 month

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test-drb September 2000