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Subject: CRT decay
Author: classiccmp(a)u.washington.edu at internet
Date: 10/31/98 11:05 PM
>I've got an old CRT that is decaying along the glass edges.
Are you saying the phosphor is peeling off the inside of the tube, the
aquedag peeling off, or is the glass actually deteriorating? I've
never seen glass deteriorate and have some television kinescopes
(CRT's) which are close to sixty years old and show no sign of decay,
including the aquedag and phosphor.
Marty
I've seen foam turn to dust, rubber turn to goo, batteries turn to acid,
but I hadn't expected CRT glass to revert to sand. Sam tells me that he's
seen something similar on his Soroc terminal.
What process is causing this? Isn't glass basically SiO2? I assume it's
crystalizing rather than oxidizing.
Anything I can do to prevent it from occurring on other tubes?
Any interesting risks associated with firing an electron gun at this
crystalized stuff with no remaining phosphor?
-- Doug
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From: Doug Yowza <yowza(a)yowza.com>
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: CRT decay
In-Reply-To: <m0zZoMa-000IyMC@p850ug1>
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<classiccmp(a)u.washington.edu>
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>> be helpfull. Do you have some, ode do you know someone who does ?
> Yes. Don Maslin, who reads this list, will send you CP/M and a bunch of
> other disks. He has almost every CP/M disk format known to man -- he does
> a great job.
Do you have his eMail address, so I could mail him ?
> There were a couple different models of the Kaypro 4 (Kaypro reused their
> model numbers even after making major internal design changes -- I detest this
> practice of reusing model numbers; so far Kaypro is the only company I've seen
> that does this). I think each needs a different version of CP/M.
I think this is better then just anounce every other month a
'new' model, while they changed only som screws.
> Take the case off, and look for a number like 8x-xxx-x on one or more of the
> chips on the motherboard. The last x may be a letter (probably A) or a number
> or might not be there at all. Kaypro's part-numbering system was rather
> erratic, it seems.
> 81-240 original (1983? maybe 1982) Kaypro 4
> 81-232 1983 Kaypro 4
> 81-184 1984 Kaypro 4 (a.k.a. Kaypro 4'84)
> 81-292 1984 Kaypro 4 (newest ROM version for this machine)
> 81-296 Kaypro 4X (with super-high-density floppies)
> 81-146 character ROM
> 81-187 character ROM
> 81-235 character ROM
On the Backside ther's some type number: 81-015 (if I remember
right) I don't know if it's for the whole machine or what and
can't see it fiting in your sceme.
Thank you
Hans
--
Ich denke, also bin ich, also gut
HRK
an excellent source of pinouts for apple ][ connectors is the apple service
technical procedures peripheral interface guide.
I have this book and it has the pinouts and peripheral configurations for
every apple model and peripheral from the apple ][ through the lisa and mac
II. this book also provides cable specs as well so one can make his own cable
also. this book would have some valuable info for everyone if there was an
easy way to copy it.
david
In a message dated 11/2/98 4:33:17 AM US Eastern Standard Time,
dastar(a)ncal.verio.com writes:
> I have the pinouts for the Apple ][ bus among other connectors inside the
> Apple ][ and don't know where to submit it (and sorry for this public
> posting but I don't know Aaron's e-mail address).
>
> Sellam Alternate e-mail:
dastar@siconic.
> com
> < enough to open a PSU. I read in a book once that opening a PSU will
> < cause damage to a special layer that prevents interference from the
> < PSU to the motherboard. I haven't been able to substantiate this...
> If that doesn't sound bogus to you I have swampland in florida to
> sell you. It's bogus.
Nono, always remember, The robots that closed the PSU have
been especialy trained to do it the right way - if you just
close the cover you might confuse the electrons ! And I have
some nice land along the Main river in Franken real cheap,
you may only have to wait until the 4 feet (1.1m) of water
are gone ...
Gruss
Hans
P.S.: The part about the water is true.
--
Ich denke, also bin ich, also gut
HRK
This person left this message on the Obsolete Computer Helpline. If
anyone can help, please write him directly at his email address in
Brazil, not to me.
----------------------------
Danilo R. Costa <danilofilho(a)uol.com.br>
Rio de Janeiro, RJ Brazil - Sunday, November 01, 1998 at 19:27:22
I'sorry but I dont speak English. I need a schematic diagram of the
TRS Color Computer ( Coco 1 or 2).
You can help me?
Thanks
the drive was indeed mfm. the models 50 and 70 had drives that connected to a
riser card which then went to the planar. there were no cables on the 50 or
70.
david
In a message dated 11/2/98 10:30:17 PM US Eastern Standard Time,
roblwill(a)usaor.net writes:
> The PS/2 Model 30=286 didn't have a cable going to the riser card in it,
> nor was it an MCA machine. It was an ISA machine, and The HD plugged into
> the motherboard via ribbon cable. I'm not even sure if it was an ESDI
> drive. I think it was just an MFM that had everything (including power) on
> one cable.
>
> -Jason
The PS/2 Model 30=286 didn't have a cable going to the riser card in it,
nor was it an MCA machine. It was an ISA machine, and The HD plugged into
the motherboard via ribbon cable. I'm not even sure if it was an ESDI
drive. I think it was just an MFM that had everything (including power) on
one cable.
-Jason
***********************************************
* Jason Willgruber *
* (roblwill(a)usaor.net) *
* *
* http://members.tripod.com/general_1 *
* ICQ#-1730318 *
* /0\/0\ *
* > Long Live the 5170! *
* \___/ *
************************************************
----------
> From: John Rollins <rexstout(a)uswest.net>
> To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
> Subject: RE: Classic != IBM AT
> Date: Monday, November 02, 1998 8:26 PM
>
>
> Hmm.. Would the 486 system I had a while back count? I forget who made
it,
> model A3000. 486DX/33 AMD CPU and FPU and some other chips were on a
small
> daughterboard that fit into a slot in the front of the computer, which
> interfaced to an MCA slot... Now that's gotta be wierd for anything.
> Closest thing to that I can think of is the hard drives IBM used in some
> PS/2's that interfaced directly to the MCA bus(interface built in to the
> drive's controller board with a cable going to the MCA riser card in the
> Model 30-286 and maybe the 55sx too). That 486 was fun, wish I still had
> it... :-|
>
> --------------------------------------------------------------
> | http://members.tripod.com/~jrollins/index.html - Computers |
> | http://www.geocities.com/Area51/Lair/1681/ - Star Trek |
> | orham(a)qth.net list admin KD7BCY |
> | ham-mac(a)qth.net Portland, OR |
> --------------------------------------------------------------
>
>
Was it Aaron Finney who was doing the Pinout collection?
I have the pinouts for the Apple ][ bus among other connectors inside the
Apple ][ and don't know where to submit it (and sorry for this public
posting but I don't know Aaron's e-mail address).
Sellam Alternate e-mail: dastar(a)siconic.com
-------------------------------------------------------------------------------
Always being hassled by the man.
Coming in 1999: Vintage Computer Festival 3.0
See http://www.vintage.org/vcf for details!
[Last web site update: 09/21/98]
Mitch Wright <mew_jac(a)swbell.net> wrote:
> Brings up another topic: Anybody got a Corvus Concept?
Yes. What, pray tell, were you up to with them?
-Frank McConnell
I consider anything that was marketed as a personal computer a
personal computer. I would not consider the PDP a personal computer if
I had one because it's not a personal computer. If you used a sedan
to haul around heavy things, would you call it a truck?
>>operate. If I could find a SYS/360 or SYS370, or Sigma/7 or Sigma/9
or
>
>That's exactly how I've viewed it as well. When I told people that
>my personal computer was a pdp-11/93 or a uVax system, they generally
>balked at the idea, though. I've had to remind them that it is a
>computer (that's never in question), and that I own it and use it.
>Hence a *personal* computer... And although I didn't have one back
>when the Imsai became available, I did get my first one (an 11/10)
>in 1980.
>
> Megan Gentry
> Former RT-11 Developer
>
>+--------------------------------+-------------------------------------+
>| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com
|
>| Unix Support Engineering Group | (home): mbg!world.std.com
|
>| Compaq Computer Corporation | addresses need '@' in place of '!'
|
>| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/
|
>| Nashua, NH 03062 | "pdp-11 programmer - some assembler
|
>| (603) 884 1055 | required." - mbg
|
>+--------------------------------+-------------------------------------+
>
>
>
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