- test-drb@ccmp.vtda.org - classiccmp.org

by Marty＠itgonline.com

______________________________ Reply Separator _________________________________ 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 ------ Message Header Follows ------ Received: from lists2.u.washington.edu by smtp.itgonline.com (PostalUnion/SMTP(tm) v2.1.9i(b5) for Windows NT(tm)) id AA-1998Oct31.230501.1767.74354; Sat, 31 Oct 1998 23:05:01 -0500 Received: from host (lists.u.washington.edu [140.142.56.13]) by lists2.u.washington.edu (8.8.4+UW97.07/8.8.4+UW98.06) with SMTP id UAA20225; Sat, 31 Oct 1998 20:02:52 -0800 Received: from mxu2.u.washington.edu (mxu2.u.washington.edu [140.142.32.9]) by lists.u.washington.edu (8.8.4+UW97.07/8.8.4+UW98.06) with ESMTP id UAA23226 for <classiccmp(a)lists.u.washington.edu>; Sat, 31 Oct 1998 20:02:48 -0800 Received: from behemoth.host4u.net (behemoth.host4u.net [209.150.128.29]) by mxu2.u.washington.edu (8.9.1+UW98.09/8.9.1+UW98.09) with ESMTP id UAA25 293 for <classiccmp(a)u.washington.edu>; Sat, 31 Oct 1998 20:02:48 -0800 Received: from localhost (yowza@localhost) by behemoth.host4u.net (8.8.5/8.8.5) with SMTP id WAA21696 for <classiccmp(a)u.washington.edu>; Sat, 31 Oct 1998 22:02:47 -0600 Message-Id: <Pine.LNX.3.95.981031214459.29291I-100000(a)behemoth.host4u.net> Date: Sat, 31 Oct 1998 22:02:44 -0600 (CST) Reply-To: classiccmp(a)u.washington.edu Sender: CLASSICCMP-owner(a)u.washington.edu Precedence: bulk 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> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> X-Sender: yowza(a)behemoth.host4u.net X-Listprocessor-Version: 8.1 beta -- ListProcessor(tm) by CREN

27 years, 8 months

1
0
0 0

About VCF 2.0 and system design

by franke＠sbs.de

>> 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

27 years, 8 months

1
0
0 0

Pinouts

by SUPRDAVE＠aol.com

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

27 years, 8 months

1
0
0 0

Repair strategy (was Re: eBay strikes again...)

by franke＠sbs.de

> < 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

27 years, 8 months

1
0
0 0

Xpost: person wants CoCo schematics

by blakeman＠creative-net.net

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

27 years, 8 months

1
0
0 0

Classic != IBM AT

by SUPRDAVE＠aol.com

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

27 years, 8 months

2
1
0 0

Classic != IBM AT

by roblwill＠usaor.net

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 | > -------------------------------------------------------------- > >

27 years, 8 months

3
3
0 0

Pinouts

by dastar＠ncal.verio.com

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]

27 years, 8 months

1
0
0 0

Corvus Concept (was Re: PDP-11/44 boot prompt)

by fmc＠reanimators.org

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

27 years, 8 months

1
0
0 0