The Baltimore County Public Schools have 100's of old (286 & earlier) PC
that need a disposal outlet. We are looking for companies that buy old
machines for resale in third-world countries. Any info that you have
that will help us to identifiy companies in this business will be
greatly appreciated. Larry Mathison (410) 887-7838,
LMATHISON(a)BCPS.ORG.
<95% true, but using RLL on stepper is fine but the main problem was
<when the maker produced drives to work with RLL used faster stepper
No it wasn't due to a lot of factors. one being the interface cable length
was more critical and since most stepper drives didn't recalibrate for
temperature after while they tended to mistrack the data and RLL has a
poorer signal to noise ratio so it would suffer more.
<design (makers tends to pack with lastest on next generation and
<leave the older alone instead of improving it more to pack more info
<instead of increassing performance which is perferable.) and that
<also include fast stepper type seeking on MFM drives as well. That's
<where you see the trouble. Noisy stepper ones tends to wear out
<than those ones that does quietly and slowly.
This is a long winded way to say, we suffered from designs that were
marginal from being pushed to far.
<Voice coil is best way to up the performance and pack more info.
It helps and is faster too but the overhead is the servo tracks or
embedded servo info. That overhead on some dries is the loss of a
side on one platter and that can represent a lot of data. Also the
servo system is more complex and expensive. This is offset by lowered
cost of hardware(electronics) as time progressed.
Allison
uh, right! and would you mind telling the audience how you crammed a square
386 chip into the xt's dip socket???
In a message dated 98-01-07 17:05:26 EST, you write:
<< [Overclocking]
I once had a PC/XT overclocked to 25 or so MHz. It caught fire...
Basically, I just pulled the chip marked 25 MHz from a dead 386
and put it where the XT's ship was. It took about 10 minutes to start
emitting black smoke.
This was before I knew they were useful...
------- >>
I have them all, i.e., 64, 64C, and a 64 in a 64C look alike case. Although
not as common as the classic 64, the 64C is not at all rare. I found a
complete one with a matching 1541C drive at a thrift the other day for $5.
Among the Commodore community the consensus is that although functionally
the same, some of the chips in the 64C had been upgraded (if I remember
correctly, specificly the sound chips among others), and it is therefore
more desirable than the standard 64.
Cliff Gregory
cgregory(a)lrbcg.com
-----Original Message-----
From: classiccmp(a)u.washington.edu <classiccmp(a)u.washington.edu>
To: Cgregory <Cgregory>
Date: Thursday, January 08, 1998 1:36 AM
Subject: Re: C-64c, How common?
>
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>From: Cord Coslor <archive(a)navix.net>
>To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
>Subject: Re: C-64c, How common?
>References: <199801080420.OAA02158(a)arthur.merlin.net.au>
>X-Listprocessor-Version: 8.1 beta -- ListProcessor(tm) by CREN
>
>I have a C64c, although I haven't found them to be very common. This unit
may
>be for sell as well if anyone is looking for one. Also, I too found a C64
in a
>third party case that looked just like the c-64... and it also was made in
>Australia. I can get this for anyone that might want this unit as well. Let
me
>know.
>
>CORD COSLOR
>
>adam(a)merlin.net.au wrote:
>
>> >I'm starting to wonder about how common the C-64c is. I have yet to see
>> >one, I picked up the manuals when a favorite bookstore had a set a few
>> >months back. Then last weekend I was at the bookstore and they had like
3
>> >or 4 sets of manual. But like I said I've never seen an actual
computer!
>>
>> I'm assuming you mean the different case design - over here (South
>> Australia) they seem to be as common as the old breadbox sort, but I
>> suspect that in numbers they are slightly less than the older designs. I
>> have three of them, and I only wanted the one. As far as I know there are
>> no functional changes, although Commodore had a history of working out
>> ways to make systems cheaper, so there may be a difference internally.
>>
>> I did find one old C64 in a third-party case which looked very much like
>> the C64c, though. Interestingly enough it was made here - I would have
>> picked it up, but I shy away from collecting computers based on the
>> different cases, as there are too many to collect just based on the
>> different systems themselves, and space is limited.
>>
>> Adam.
>
>
>
>
>Well, I've found a source of PS/2 parts/systems, but it'll cost. It's a
>company. They seem to have tons of the stuff. Their URL is
>http://www.kahlon.com . The problem is that they list(ed) a Model 55SX as
>$249, but that did include a monitor. Well, you could probably say that
you
>collect classics and that that price is way out of whack, but that might
not
>work....
>Tim D. Hotze
I suspect that here in Sydney, Australia the price of PS/2's is about to
tumble to insignificance. It seems a lot of corporations bought whole
networks of them in the early 90's and they are at the end of their
usefulness when they move away from DOS/Win3.1 I have recently seen model
70 boxes advertised for $A30 and actually acquired a model 76 box for $A70,
with 8Mb and 200Mb SCSI. (thats about $US20 and $US45)
I've gotten back to looking into getting the my VAXstation up and running.
This has gotten me to thinking, how many MIPS is a VUP?
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)ix.netcom.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| For Empire of the Petal Throne and Traveller Role Playing, |
| see http://www.dragonfire.net/~healyzh/ |
| For the collecting of Classic Computers with info on them. |
| see http://www.dragonfire.net/~healyzh/museum.html |
Well, I've found a source of PS/2 parts/systems, but it'll cost. It's a
company. They seem to have tons of the stuff. Their URL is
http://www.kahlon.com . The problem is that they list(ed) a Model 55SX as
$249, but that did include a monitor. Well, you could probably say that you
collect classics and that that price is way out of whack, but that might not
work....
Tim D. Hotze
-----Original Message-----
From: jpero(a)cgo.wave.ca <jpero(a)cgo.wave.ca>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Thursday, January 08, 1998 4:18 AM
Subject: Re: The IBM PS/2 model 70 again! -E61
Hi!
> I have this model in my collection. i managed to get it for $25 but have
not
> been able to test it since mine came with a radius two page display card
which
> is useless without the monitor. i finally did get a 1bit video card for
it,
> but now need to find a mono display for it which i still havent found! the
cx
> is a 68030 running at 16mhz. a better deal would be the IIci model which
is
> 25mhz and built in video which can be used with a vga monitor if you use a
> special dongle.
I noticed after I surfed the net, and I do remember it had no video
card. BUMMER! If it was IIci, I would grab it.
> RE: ps2 models; I have 3 of them: two 8530 and a 9577. the model 77 i
bought
> from work when they upgraded to pc300 desktops. two scsi adaptors, 16 meg,
200
> 400meg scsi drives running hpfs and os2 3.0. its an industrial strength
> machine, and will probably outlive any other computer i own.
David, how cheap did you gotten some of these parts through this
mail list? Model 77? I do not know this specs, kindly tell me what
about this? :)
My book does not list this Model 77.
Jason D.
> david.
<I once had a PC/XT overclocked to 25 or so MHz. It caught fire...
<Basically, I just pulled the chip marked 25 MHz from a dead 386
<and put it where the XT's ship was. It took about 10 minutes to start em
I find this a good story. ;-) The fastest 8088 ever made was 10mhz if
you squint it may hit 12. As far as putting a 386 in a 8088
socket...there is the matter of the 100 or so extra pins.
Oh, if the 25 mhz clock was input to the 8284A then the cpu clock would
be 8.333mhz... almost believable save for the rest of the logic on the xt
board would not generally run that fast without adding waitstates.
Allison
Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
> In fact what's really holding me back is that I don't have a
> specification of the CS/80 or amigo command sets (the commands that HP
> used for their drives, and which are sort-of a de-facto standard). If
> anyone has this spec, I'll consider building this interface.
Well, Tony, once upon a time I think I was thinking about sending you
some chunks of the 7941/7945 service manual that describe some portion
of the CS/80 protocol used by those devices. I vaguely recall it was
enough of a subset that we came to the conclusion that it wouldn't
help, but if you still think it would be useful send me your postal
address and I will make a trip to the copy shop.
Also it is my understanding that the "hp300" flavors of NetBSD and
OpenBSD contain working code to talk to CS/80 devices. It may be in
the 4.4-Lite BSD release, I think that is where I remember seeing it
first.
The CS/80 command-set reference is one of those manuals that HP Direct
refused to sell me. I had the part number, and the HP Direct folks
told me that it had been withdrawn from offer. Maybe I should give
that another shot; it's been some years ago now.
...
More vague memories: not all HP-IB discs talk CS/80. There was also
a "subset" or "simple" protocol, SS/80. Was that "Amigo"? I can't
remember. I think it is the protocol used by the 91xx discs, and
those are what the Integral seems to recognize.
-Frank McConnell
At 05:46 PM 1/5/98 -0800, you wrote:
>>It's recycling.
Don't get pissed off. Look at it as an opportunity. They're in business to
make money; they don't care about preserving history or any goody-two-shoes
thing like that. So offer 'em 5 cents/pound more than the melters if you
get first crack at older systems.
And, contrary to what the media seems to think, continued used is actually
better than recycling something. (Which is why I drive a 38 year old car
rather than a brand new, *recyclable* one that doesn't get any better gas
mileage.)
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
roger(a)sinasohn.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.crl.com/~sinasohn/
