test-drb November 2003

test-drb@ccmp.vtda.org

289 participants
485 discussions

by tony＠girasoli.org

Hi Ran, I came across your posting of stuff you are selling. Do you have one of the Currah Speech Messenger carts left? Let me know. Thank you! Tony

21 years, 1 month

Picture of VFC

by dwight.elvey＠amd.com

Hi Erik I have the pictures I took at vfc. You said you'd put these up on your web page. How should I send them? Dwight

21 years, 1 month

Anyone looking for a Apple eMate 300

by jrkeys＠concentric.net

I picked up a few this weekend contact me off list if you would like to trade or purchase one.

21 years, 1 month

DEC TTY Connector Source?

by CPUMECH＠aol.com

Try Dataterm Inc. 781-938-1010. They have all that old stuff including 33tty parts.

21 years, 1 month

ANTS!!!!

by pete＠dunnington.u-net.com

On Nov 17, 7:58, Joe Stevenson wrote: > Fly spray shouldn't hurt the board, but I would spray it down with contact cleaner. > The biggest worry from ants is the formic acid they produce. Hopefully that did not > damage the board. NOT contact cleaner. Proper contact cleaner contains oils that will stay behind; fine in minute amounts on your switch contacts, but not in your ROM sockets, or all over a board where it collects all manner of airborne crud. Iso-propyl alcohol -- which is the carrier in contact cleaner -- would be OK, so would ethanol. Neither will do much about the formic acid; water will be better for that. -- Pete Peter Turnbull Network Manager University of York

21 years, 1 month

Lot of 6 Z-89s, 2 VT100s, VT180, other terminals, DECfloppy drives availa...

by dwight.elvey＠amd.com

>From: "Vintage Computer Festival" <vcf(a)siconic.com> > >On Mon, 17 Nov 2003, Joe wrote: > >> They were also used in some of their MDSs. It was also optional in the >> iPDSs. In it the bubble usually contained the operating system and >> developement software but it acted as a disk drive so you could store >> anything in it that you wanted to. > >The Sharp PC-5000 uses bubble memory carthridges as "disk drives". It >runs MS-DOS from the bubble memory. Another computer that uses bubble >memory is the Teleram 3000 (very obscure). > >> FWIW I used to have a bubble memory card for the PC. It came with a >> collection of bubble memory manuals, data sheets and other docs and some >> developement software. I THINK it was put out by Intel but it's been a long >> time since I've seen it. > >That sounds really cool. Along with several dozen bubble memory modules >plus a bunch of bubble memory boards and several computers that use bubble >memory, I have a book on using bubble memory and a TI datasheet on their >bubble memory product. > >Bubble memory is cool. It is kind of like moving core memory. Actually, it takes quite a bit of power to run. I'd say it was hot. Dwight

21 years, 1 month

ANTS!!!!

by dwight.elvey＠amd.com

Hi Thanks for mentioning this. Also, if you don't want to find dead ants all over the oven, put a pan of hot water ( with a little soap added ) under the object. When they come out, they fall in. The soap or detergent makes sure they drown. This heating method also works for termites. Some exterminators actually tent the house in an insulator and just heat the house. To bad that is doesn't kill dry rot. Dwight >From: "John Allain" <allain(a)panix.com> > >> Just put it in the oven at between 125 >> and 130F for a couple of hours. > >I'd recommend using the oven only in a passive mode. >The radiant heat of a live element probably exceeds >125 by a lot. I melted some plastic once in an oven set >very low. Next time I do this I'll preheat the oven, shut it >off, wait a few minutes and then use the residual heat. > >John A. > >

21 years, 1 month

Runout vs. Flatness and Dial test indicators

by jwest＠classiccmp.org

There is a section in the 7906 service manual where they do a test for "runout" with a dial test indicator. Then there is a separate test to measure flatness. These are two tests that are done when replacing the fixed platter. I understand the concept of a dial test indicator and basically what it does... and they show a picture of how to position the guage when checking runout, and how to position it when checking flatness. Two questions come to mind that aren't clear from the manual. I can't tell from the pictures where exactly they place the ball on the fixed media when testing runout. It LOOKS like they put it touching the outside (in the same plane as the media), then rotate once. This would seem to me to really be testing how "circular" the media is. Is that runout? Then, to test flatness, it appears they put the ball on the surface of the fixed media. Surely turning the media with a metal ball on it is pretty bad. So, can someone explain to me the difference between runout and flatness, specifically with regards to a disk platter. And, where they would put the ball exactly for each test? Also, I assume any dial test guage that is graduated correctly will work. However, the HP one apparently has a lever on it for flatness or runout. General dial test indicators do not. Any ideas there? Thanks for helping my confusion :) Jay

21 years, 1 month

ANTS!!!!

by pete＠dunnington.u-net.com

On Nov 17, 12:06, Patrick Rigney wrote: > If an amount of this oil were to become trapped in a layer under a soldered > chip or socket, is it sufficiently conductive to cause signal crosstalk? Very unlikely, since silicon oil is a pretty good insulator. The reason it is good for electrical contacts is that it promotes the cleaning of oxide layers by the wiping action as contacts move over each other, and it prevents further oxide from forming by creating a non-reactive coating which is also very thin. -- Pete Peter Turnbull Network Manager University of York

21 years, 1 month

Bay Technical Associates 953B

by amventura＠hotmail.com

Quote Alternatively, I have a serial-based programmer that ISTR has an interactive hex dump feature - you talk to it over a 2-way RS-232 link and can dump data to it, or send interactive commands. There's no "program" or "copy" button. It's a Bay Technical Associates 953B. Haven't used it in years. Think it only does 1Kbit to 8Kbit devices and no funny pinout stuff like thge 2532. /Quote Do you have the software to use this product, or know where I could get it? Thanks in advance, Anthony Ventura _________________________________________________________________ Great deals on high-speed Internet access as low as $26.95. https://broadband.msn.com (Prices may vary by service area.)

21 years, 1 month

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test-drb November 2003