< > 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
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
>
>
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..."
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
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
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
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
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
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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
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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]
>
>
> 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.
