test-drb December 1998

test-drb@ccmp.vtda.org

168 participants
844 discussions

Now VERY *OT* (hit delete now): RE: networking newbie

by allisonp＠world.std.com

< > NT - about a day to get set up and working (or not at all in this < > case!). Needs lots of hardware. Costs lots. My $0.02. I just took a job where win95 and win/NT are it. I'm sure they could be migrated to linux BUT, I'm paid (well!!) to maintain and move their systems forward both hardware and software wise. Personally MS stuff stinks, I'm not paid for that opinion. I'm paid to provide my peice in helping to keep the business in the black. The management is not married to DOS/WIN/NT as a "they are great" but rather it does the job for the scale of business they are and within costs. The user base however could never work with linux(unix). Oh, Bif4win is garbage!!!! Allison

25 years, 5 months

FSOT: IBM 4869 external 5 1/4" floppy drive

by roblwill＠usaor.net

Sort of off the topic of the drives for sale, but on the topic of an external IBM disk drive. I have the cable from a 4869 drive connected to a full-height drive (IBM), which is connected to a 4869 P/S on my IBM PC. However, it doesn't look so good. I was wondering if anyone had an old TRS-80 disk box (mod. 1 style) that they'd be willing to part with for a few bucks. The drive itself doesn't need to work. All I really need is the box and the P/S for it, so I have something to house my external drive "B" in. ThAnX, -- -Jason Willgruber (roblwill(a)usaor.net) ICQ#: 1730318 <http://members.tripod.com/general_1> -----Original Message----- From: Joe <rigdonj(a)intellistar.net> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Tuesday, December 01, 1998 3:39 PM Subject: FSOT: IBM 4869 external 5 1/4" floppy drive >The title says it all. External floppy drive made by IBM. Excellent >condition. It has the standard DB-37 connector. I think it's a 1.2Mb model >but I'm not sure. Guaranteed against DOA. > > Joe > >

25 years, 5 months

FW: MicroVAX 3100 -- complete system! -- available

by kyrrin＠bluefeathertech.com

Found on Usenet. This sounds like a great opportunity for someone who wants a MicroVAXen to get started. I already E-mailed to the guy that I guesstimated the system value at between $50 and $75. Please contact him directly if you're interested. Attachment follows. -=-=- <snip> -=-=- >>From: Scott Hale <Shale(a)cncdsl.com> >>Newsgroups: comp.sys.dec,comp.sys.dec.micro >>Subject: Microvax 3100 available >>Date: 01 Dec 1998 10:54:09 PST >>Organization: Sherman Clay & Co >>Lines: 22 >>Message-ID: <36643B50.2A88236D(a)cncdsl.com> >>Reply-To: Shale(a)sclay.com >>NNTP-Posting-Host: 209.31.3.16 >>Mime-Version: 1.0 >>Content-Type: text/plain; charset=us-ascii >>Content-Transfer-Encoding: 7bit >>X-Mailer: Mozilla 4.5 [en] (Win98; I) >>X-Accept-Language: en >>Path: blushng.jps.net!news.eli.net!spamkiller1.cwix.com!newsfeed.cwix.com!128.32.206.55!newsfeed.berkeley.edu!news.stanford.edu!newsfeed.concentric.net!207.155.183.80.MISMATCH!global-news-master >>Xref: blushng.jps.net comp.sys.dec:4904 comp.sys.dec.micro:657 >> >>Through a company acq we have acquired the below system: >> >>Microvax 3100/20-20RZ=tk5 >>OS: vms 5.5 >>32mb memory >>4 internal HD (500mb, 400mb, 100mb, 100mb) >>External TK50 tape unit >>VMS licenses included >> >>We gone through a few VAX resellers with no luck. Is there any value to >>the above system or is it complete junk? >> >>Anybody interested in buying, pls contact me. >> >>thanks! >> >>Scott Hale >>PC/LAN Manager >>Sherman Clay & Co >>Shale(a)sclay.com >> -=-=-=-=-=-=-=-=- Bruce Lane, Owner and head honcho, Blue Feather Technologies -- kyrrin (at) bluefeathertech [dot] com Web: http://www.bluefeathertech.com "...No matter how we may wish otherwise, our science can only describe an object, event, or living thing in our own human terms. It cannot possibly define any of them..."

25 years, 5 months

Recent Finds & Thoughts

by pete＠dunnington.u-net.com

On Dec 1, 15:19, Cameron Kaiser wrote: > The question is, does source => Dolby encoding => Dolby decoding == source? > Dolby encoding, AFAIK, increases the volume of sounds >10KHz, and decoding > does the reverse. There are three Dolby systems, all based on audio companders. Dolby A (the "professional" one, used by some recording studios for master tapes) works by splitting the audio into a number of frequency bands (like a graphic equaliser does). On recording, each band is then fed through a compressor to reduce the dynamic range, thus keeping the volume level fairly high. On playback, it's fed through an expander to recreate the dynamic range of the original signal. Dolby B is a simpler version, with a single filter for HF; it uses a similar compander for the upper frequencies only. Dolby C is a n "improved" Dolby B, which (IIRC) uses a different corner frequency and different compander. None of them use any form of frequency shifting. The reason Dolby B and C work so well (for tape, which is what they were designed for) is that tape hiss is largely made up of HF noise. You don't hear the hiss if the signal is at a sufficiently greater level than the hiss (which is more-or-less constant) -- in other words, if the signal-to-noise ratio is high enough. So Dolby B/C boost the level of quiet sections of the high frequency signal before recording, but leave the louder passages as-is, to avoid saturation. On playback, the amplitude of the quieter passages is attenuated again, and the hiss is attenuated with it. > However, that doesn't mean that there won't be subtle > differences between one particular encoder and a particular decoder's > respective frequency responses, so you can't be sure they'll be precisely > the same. Your ear won't care, but I bet the computer might. Unlikely to make much difference, unless the filter corner frequencies and rolloffs were quite different, which Dolby Labs were quite picky about before granting licences. > I came up with, during my days when I was too cheap/poor to spring for prefab > audio equipment, a superamplification system that was Dolby compatible. I'm > not saying that *that* was how Dolby worked (in fact, I'm sure it isn't), but > on the treble section of the sound, which is where Dolby NR operates, it was > pretty #$%&ing destructive. I wouldn't risk it. Then it wasn't Dolby-compatible :-) -- Pete Peter Turnbull Dept. of Computer Science University of York

25 years, 5 months

Help! Need service info for HP 9835

by rigdonj＠intellistar.net

I finally tore into my "new" HP 9835. I found something on the power supply card as completely burned away. All the output voltages are present but low. It would save a lot time if some would sell or loan me a service manual for this old beast. Thanks, Joe

25 years, 5 months

Recent Finds & Thoughts

by pete＠dunnington.u-net.com

On Dec 1, 18:55, Tony Duell wrote: > Well, if audio processing that leaves the signal going to the output > socket unchanged (like recording with Dolby, playback with Dolby) still > allows the copy to load, then I think audio recording onto a CD would > work. In fact I can't think of a good reason why it wouldn't work, based > on my understanding of the CD system. There was an article in one of the Acorn newgroups the other day, from someone who had done exactly that for hundreds of his old computer tapes, and was extolling the virtues of being able to find things, having reliable reproduction, etc. He made no mention of any special signal processing. -- Pete Peter Turnbull Dept. of Computer Science University of York

25 years, 5 months

FSOT: IBM 4869 external 5 1/4" floppy drive

by rigdonj＠intellistar.net

The title says it all. External floppy drive made by IBM. Excellent condition. It has the standard DB-37 connector. I think it's a 1.2Mb model but I'm not sure. Guaranteed against DOA. Joe

25 years, 5 months

HP Laserjet Series II

by Marty＠itgonline.com

The Feed Roller Assembly indeed is the entire shaft with clutch and feed roller. My experience on SX engines has been clutch failure more often than solenoid failure on the paper control pca although the feed roller replacement was the most common failure for me. I was repairing these for the US ARmy Personnel Command in Alexandria, Virginia on a daily basis and learned to swap out the entire feed roller assembly at once to ensure the printer was back online okay and avoid a recall. I'd typically get about six SX calls a day (along with various pc problems and other printer calls) so I had to keep moving. I would rebuild these feed roller assemblies in my office when time and replacement parts allowed. Regarding the CX engine, the clutch in the cassette feed roller assembly (which requires splitting the clamshell> a piece of cake after you've done it a few times) was the biggest feed failure item I encountered. Those weird feed wedges (three I seem to recall) rarely failed. Marty ______________________________ Reply Separator _________________________________ Subject: Re: HP Laserjet Series II Author: classiccmp(a)u.washington.edu at internet Date: 12/1/98 5:04 PM > > I have repaired literally hundreds of HP II's and HP III's over the Ditto... > past 10 years. The paper feed problem you mention is a piece of cake > to repair (replace) and the parts are readily available at a very low > price. Following are the parts you need: > > HP P/N RG1-0931-060CN FEED ROLLER ASSEMBLY Isn't that the complete spindle with the clutch, etc. It's a _lot_ cheaper to buy just the worn roller (I have _never_ had a clutch fail), and almost as quick to change it. There is another common cause for paper jams in that area. Namely that one of the clutch solenoids isn't firing - either the pickup clutch solenoid or the registration solenoid. There are 2 ways to tell : How far does the paper move ? About 1" -> registration solenoid A little -> worn pickup roller Not at all -> pickup solenoid or totally worn roller. If there is a solenoid problem, there are 3 solutions : Replace the 'electronic component assembly' (PSU + clutch board) -- $$$$$$$$ Replace the switch/solenoid PCB (clutch board) -- $$$ Fix the darn thing. There are _4_ components for each clutch - the solenoid, the back-emf protection diode, the driver transistor, and its base resistor. The transistor is the most likely failure, btw. It actually takes less time to test the components than to look up the price/part number for the PCB :-) It could also be a problem on the DC controller board, but I have never had that. -tony ------ Message Header Follows ------ Received: from lists5.u.washington.edu by smtp.itgonline.com (PostalUnion/SMTP(tm) v2.1.9i(b5) for Windows NT(tm)) id AA-1998Dec01.170458.1767.81345; Tue, 01 Dec 1998 17:04:59 -0500 Received: from host (lists.u.washington.edu [140.142.56.13]) by lists5.u.washington.edu (8.8.4+UW97.07/8.8.4+UW98.06) with SMTP id OAA19811; Tue, 1 Dec 1998 14:02:35 -0800 Received: from mxu1.u.washington.edu (mxu1.u.washington.edu [140.142.32.8]) by lists.u.washington.edu (8.8.4+UW97.07/8.8.4+UW98.06) with ESMTP id OAA22394 for <classiccmp(a)lists.u.washington.edu>; Tue, 1 Dec 1998 14:01:42 -0800 Received: from post.mail.demon.net (post-12.mail.demon.net [194.217.242.41]) by mxu1.u.washington.edu (8.9.1+UW98.09/8.9.1+UW98.09) with ESMTP id OAA15 680 for <classiccmp(a)u.washington.edu>; Tue, 1 Dec 1998 14:01:10 -0800 Received: from [158.152.97.199] (helo=p850ug1) by post.mail.demon.net with smtp (Exim 2.053 #1) id 0zkxpA-0002sa-00 for classiccmp(a)u.washington.edu; Tue, 1 Dec 1998 21:59:12 +0000 Received: by p850ug1 id <m0zkvCX-000IyRC@p850ug1> (Debian /\oo/\ Smail3.1.29.1 #29.33); Tue, 1 Dec 98 19:11 GMT Message-Id: <m0zkvCX-000IyRC@p850ug1> Date: Tue, 1 Dec 1998 19:11:07 +0000 (GMT) Reply-To: classiccmp(a)u.washington.edu Sender: CLASSICCMP-owner(a)u.washington.edu Precedence: bulk From: ard(a)p850ug1.demon.co.uk (Tony Duell) To: "Discussion re-collecting of classic computers" <classiccmp(a)u.washington.edu> Subject: Re: HP Laserjet Series II In-Reply-To: <1998Dec01.092201.1767.164934(a)smtp.itgonline.com> from "Marty" at Dec 1, 98 09:23:27 am Content-Type: text X-Listprocessor-Version: 8.1 beta -- ListProcessor(tm) by CREN

25 years, 5 months

(OT) SUBSCRIBE CLASSICCMP

by roblwill＠usaor.net

What does that have to do with fixing/using classic computers? -- -Jason Willgruber (roblwill(a)usaor.net) ICQ#: 1730318 <http://members.tripod.com/general_1> >> Actually, a few months ago, a bus driver was stabbed to death here in Boston. >> And of course, buses are blown up often in Israel, though nothing has happened >> recently. But what were the results of this incident, Derek? How many >> injured/killed? >> >I never heared of such a thing over here. Shooting a bus driver ? >> >The last time I remember was I think 1972 at the Munich Olypics, >> >at the masacre on the airport (you may remember the terrorist >> >attack) - and of course similar things had hapend in the Bosinan >> >war. But in an ordinary city ? And mestupidone belived Seattle >> >to be a 'regular' safe place. >> >> >Gruss >> >Hans >> > >> > > >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: 11/02/98] > >

25 years, 5 months

DG Aviion video

by Philip.Belben＠pgen.com

> Also, the colour video output is on 3 BNC connectors. Can I use 3 segments > of ethernet coax to carry the video signal or is the impedance wrong? Has someone else answered this? I can't remember. Anyway: Impedance of Etehernet coax is 50 ohms; impedance of video coax should be 75 ohms. You will get slight ghosting from reflections etc. if your leads are longer than a few feet. More importantly, 75 ohm BNC connectors are not quite the same mechanically as 50 ohm ones. Plug in the wrong combination and you get slight mechanical damage or a poor contact (can't remember which is which. I think it's 50 ohm plug in 75 ohm socket => mechanical damage, 75 ohm plug in 50 ohm socket => poor contact) It might work in a pinch but it's not recommended. Philip.

25 years, 5 months

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test-drb December 1998