test-drb December 2001

test-drb@ccmp.vtda.org

243 participants
1096 discussions

by Innfogra＠aol.com

In a message dated 12/29/01 3:15:45 PM Pacific Standard Time, geoffr(a)zipcon.net writes: > > > This is going back into a very fuzzy memory...but does anyone know if > > > an Archive 2150S drive (QIC-150) will read QIC-24 tapes? Those drives > > > are pretty common, and they're standard SCSI so they don't require > > > less common interface hardware. And, I think I have one. :-) > > 2150S will read a QIC24 tape just fine. > Most any 60 meg, 150 meg and IIRC 525 meg drives will read QIC-24, Serial Recorded Magnetic Tape Cartridge for Information Interchange (9 tracks, 10,000 FTPI, GCR, 60 MB) Here is a link to the QIC Standards. http://www2.qic.org/qic/html/qicstan.html QUIC-02 & QIC-36 are interface standards and should not be confused with QIC-24 which is a format for information interchange. The QIC-02 interface 150 meg drive should work if you have a QIC-02 controller in your computer. SCSI drives are easier. An Archive 2150S should work fine. Paxton Astoria, OR

24 years, 1 month

Try it!!!! (Was - Re: One More PCB Dishwasher Question)

by ajp166＠bellatlantic.net

From: Fred Cisin (XenoSoft) <cisin(a)xenosoft.com> >And where can I get a dish^H^H^H^Hboard washer that STARTS at 150 degrees? >Mine takes a while to flush the cold water through the system before it >starts spraying hot. When I turn on a "HOT" water faucet, in MY house, it >takes it close to a minute to come up to temperature. One of the >consequences of long pipes and not sharing plumbing with a lot of other >people. Thank you for pointing out the most practical matter of it all. Allison

24 years, 1 month

Try it!!!! (Was - Re: One More PCB Dishwasher Question)

by ajp166＠bellatlantic.net

From: William Donzelli <aw288(a)osfn.org> >I would think the thermal shock of the chips hitting the hot water would >be a failure mechanism. Hot air and hot water are different things, even >at the same temperature. The thermal resistance of a water to ceramic (or Not an issue as the temps are well blow boiling (nominal 145f). >plastic) junction is much, much lower, than one with air, so during the >first seconds of the wash cycle, the chips go from ambient >temperature to something rather high. Lots of stress results, especially >if only some of the chip's package gets wet. Preheating the boards would >help reduce the shock greatly, but home dishwashers do not do that (not a >good idea to cook the food onto the plates before trying to wash them!). Not required. >The above is one of the reasons why liquid cooled electronics are a bit >tricky. The cooling units *never* just start pumping cold water when the >power is applied. There is always a stabilization period, so the shock is >reduced. Some do, other run the cooling first and let the coolant temp climb to operating temp gradually. Others preheat the coolant to working temp so the system can come on line faster. Allison

24 years, 1 month

AVAILABLE-- PDP, DEC parts

by LFessen106＠aol.com

In a message dated 12/28/01 7:50:09 PM Eastern Standard Time, rschaefe(a)gcfn.org writes: > I talked to a man named Jon Ikoniak at temple.edu in PA not too long ago. > Seems he has a large collection of old DEC gear he inherited from a > predecessor. He said that a lot of the complete units have been gobbled up, > but there are still a few racks > left, and lots of drives and parts. They appear to be free. I was planning > on posting his email address, but after the last virus I got from my buddy > s.ring, contact me off-list for email or a voice number. I would be interested in information. I actually live close by.

24 years, 1 month

Tape drive needed

by fernande＠internet1.net

The other day I found a SCO Open Desktop 2.0.0 media kit, on Qic24 tape. I don't have the correct drive...... I don't have any tape drive experience, actually. Does anybody have an unneeded Qic24 SCSI tape drive? I checked Ebay and I didn't see anything that I thought was what I needed. I wish this were on cd..... that would be easy! Chad Fernandez Michigan, USA

24 years, 1 month

Jumper settings needed for Heath H-27 disk controller

by erd_6502＠yahoo.com

As I've mentioned before, I have a Heathkit H-11 with standard Heathkit disk controller. The disk controller locks up the CPU if it's in place in the interrupt chain (it will begin the boot process if it's behind all the cards with a gap in the grant chain, but after loading the boot sector and turning on interrupts, the OS, naturally, won't run). So... I have tested all the TTL chips in a chip tester. What I can't test are the 88xx bus chips. From tracing the grant pins, I think the 8837 is what hangs off the interrupt lines. I have finally found some (unsoldered) loose replacements. What I still lack are schematics or at least a jumper map. The jumpers have been soldered and cut and resoldered before I received the card. As a result, I have no idea what they are supposed to be set at. Does anyone know the state of the jumpers for default operation? Thanks, -ethan __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com

24 years, 1 month

Try it!!!! (Was - Re: One More PCB Dishwasher Question)

by ajp166＠bellatlantic.net

From: Ben Franchuk <bfranchuk(a)jetnet.ab.ca> >While you hear a lot about 'classic' common old CPU's -- apple, radio >shack, >commodore do people find any homebrewed computers did that all stop when >the S-100 bus came out? No, if anything the MITS box was the kickoff. Alllison

24 years, 1 month

Interactive UNIX boxed set - free for shipping

by erd_6502＠yahoo.com

I have a set of disks and manuals for Interactive UNIX 2.0. I got it way back when my local ham radio club was big time into it. Linux eventually displaced Interactive as a favored distribution, but 10+ years ago, if you wanted SysV r3.2 for an i386, this was one of the best ways to do it. We used it largely for UUCP, but on more than one occasion, I used Vpix, the DOS environment emulator that ships as an option to Interactive UNIX, so I could run the Microsoft C compiler to produce some little command-line tool. By today's standards, it's a footnote of the OS wars. If, however, you want something which was representative of the times, it's a nice thing to have. I do not need it and am offering it to the list before discarding it. Free to good home; you pay shipping from 43202. It will be several pounds due to the quantity of paper. -ethan __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com

24 years, 1 month

Try it!!!! (Was - Re: One More PCB Dishwasher Question)

by mcguire＠neurotica.com

On December 29, Bob Shannon wrote: > At Media 100 Inc, we make high-end video equipment, non-linear > editors. We use very fancy TXCO's, (+/-2 ppb) and they do not Oh My. If any of those should happen to "fall out", let me know. 8-) -Dave -- Dave McGuire St. Petersburg, FL "Less talk. More synthohol." --Lt. Worf

24 years, 1 month

Try it!!!! (Was - Re: One More PCB Dishwasher Question)

by ajp166＠bellatlantic.net

If you consider 65f to 145f heat shocking significant then whatever you do don't turn on your PC. Seriously, that is not enough temp change and cycles, common temp shock testing {operating} is freezing water to 158F water {+70C} for many (usually hundreds of cycles). Usually the upper temp is not the operational limit but, the storage limit (in the 150C {300f} range!). Never minding what wave soldering a 16pin dip does in a room temp to molten solder step! For the average dishwasher that would likely be only one cycle of the 65-145F span as well. Again if your really that worried, don't. Reality is that anything that woud be that fussy is really fragile. The only examples of something I'd worry about down RI there is the PDP-12 a(maybe) and definatly the PB250{uses germainium transistors with low Tstorage and operating range, delay lines and other rare items}. Even then my viewing of both of those is they were very clean and not likely at issue. Allison -----Original Message----- From: William Donzelli <aw288(a)osfn.org> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Saturday, December 29, 2001 3:05 PM Subject: Re: Try it!!!! (Was - Re: One More PCB Dishwasher Question) >> Not an issue as the temps are well blow boiling (nominal 145f). > >You missed the whole point. A sudden change (as in a second or so) from >65 F to 145 F will shock a chip far more than a gradual change (15 >seconds) from 65 F to 212 F. It is the rate of change, and not the >change itself, that matters. With hot water hitting the chips instantly, >the rate of change is going to be *really* fast. It may also be uneven - >if a large chip only gets half soaked with the hot water at startup. > >William Donzelli >aw288(a)osfn.org

24 years, 1 month

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test-drb December 2001