Hi,
Does anyone in the UK have access to equipment capable of dumping the data
>from 27C020 PLCC EPROMs? I have several which I want to preserve the data
from. If you do, please contact me.
(Alternatively, loan of a PLCC-to-DIP adapter for EPROMs would be just
fine...)
Bye,
-- Mark
--- CLASSICCMP(a)trailing-edge.com wrote:
> In the past few months, I've been heavily involved with upgrading
> some CAT scanners that date from the late 70's...
>
> The PC boards that make up the backprojector make use of a unique
> technology: the PC boards themselves are just plain old two-layer boards,
> with the actual PC traces carrying only power and ground. All the actual
> wiring is done by fine machine-laid wiring between pads, with all
> the wire layers "potted" in a plastic compound.
The last design a former employer did was with a technology derived from this,
Augat's Unilayer. We sent them gerber plots and a couple of weeks later (for
an outrageous sum of money), we got back ten VAXBI 68010-based communications
boards. Our break-even cost on a custom 10-layer (yes... DEC specified ten
layers) was in the neighborhood of 20-25 boards. We never sold out of these
VAX-BI units, so it was a worthwhile way to go.
The actual construction was of two "decals" with embedded wires. Once spun,
they were laid onto a perforated board and tacked down to small solder pads
next to the holes, most of which had spring inserts in them. One defective
board turned out to be a missing insert, thus, no electrical contact between
pin and wire. A quick fix. We did re-work these - there was one ECO of a
cut and a 1" jump. No fun, even with the microscope.
I still have the boards. One of these days, I'll scan them in with the
rest of our DEC<->IBM product line (PDP-11/04's in the *real* old days,
custom 68K boards to the end in the 1990's).
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
__________________________________________________
Do You Yahoo!?
Bid and sell for free at http://auctions.yahoo.com
Hello,
We are looking for one or more Canon Cats to backup/replace existing
working units in our office. Can you help or advise?
I found your e-mail address on the Web while searching for info on the
Cats.
Regards, Ted Blishak
First Cabin Holidays, Inc. dba Accent On Travel-USA
3939 S Sixth St., PMB 331, Klamath Falls, OR 97603
ph 541 885 7330 800 347 0645
fax 541 883 6457 http://www.trainweb.com/aot
Holy gods of computing! I just spotted a PDP8/e system thats available!
Its at times like this, that I really wish I had a working car... Ah well,
I'll have to convince some local friends to help me out. I REALLY want
a working PDP8/e...
-Lawrence LeMay
Hi!
I just changed ISPs, because my previous one was unreliable. With the
change of ISP's, the email that is currently subscribed to classiccmp will
also be gone in about a month, if not less.
I would like to know how to unsubscribe and resubscribe to classiccmp, to
prevent the listserv screw-ups that would happen when the email address
dissappears into oblivion.
Thanx,
-Jason
( general-1(a)home.com )
I just got an old AT&T PC 3600, but the monitor won't power up (no display
activity at all). There used to be a VGA commected to the computer through
another card, but the card was removed. Is it a possibility that the main
video card (with the 25 pin connector) was somehow disabled? If so, How do
I re-enable it?
It doesn't appear that power is getting to the monitor.
ThAnX,
-Jason
( general-1(a)home.com )
This is quite tangential to the subject, but since it relates to 8"
floppies, I'll proceed.
I have, among many other things, a box from SMS, which originally was an SMS
FT400 "floppy terminal" (their nomenclature for a standalone FDC with two
drives in a powered enclosure) from which I removed one of two power
supplies, this one intended to power the 8X300-controlled 8" drive interface
board, capable of both single and double-density, and, though it didn't have
them in it, supposedly double-sided drives as well. The box has sat outside
and the label has been discolored and faded by the sun for the past 10
years. Nevertheless, it's a solid and convenient package for otherwise
unusable (due to the packaging trend which shifted from vertical to
horizontal mounting for 8" drives, and resulted in the narrower "-R" type
frame for 8" drives) "standard-frame" drives, of which I have a few, having
recently aligned and cleaned a whole bunch for distribution to wherever.
I'd like opinions, taking into consideration that the labels are faded to an
almost unrecognizable state, as to whether it would be more desirable, from
the standpoint of a collector, to restore the original power supply and
controller board, along with the original model 800-2 drives, to the
enclosure and use it with the standard parallel (several of them, and NOT a
PC parallel port!) port interface or would it be more sensible to save the
effort of reinstalling the controller power supply (the drive supply is
still in there!) and the controller, and the interface panel from the back
(if I find it), as opposed to simply cleaning it up and replacing the
discolored vinyl panels with aluminum ones painted to match the box and
maybe using the box to house a single-board computer using the drives in the
box.
The controller/drive combination in a standalone box was what enabled me,
back in '79-'80, with the aid of Wayne Wall to write the drivers, to attach
a totally unsupported 6502 system to these drives and run the APEX OS
written back then by Peter Boyle for his Digital Group system, which this
one emulated to large extent. I find this an attractive prospect, but can't
find a sound reason for it, since I don't intend to resurrect the original
host system. Maybe I'm overlooking something, though.
Any suggestions?
Dick
-----Original Message-----
From: Ethan Dicks <ethan_dicks(a)yahoo.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Monday, October 04, 1999 1:09 PM
Subject: Re: 8-inch floppy availability
>
>
>--- CLASSICCMP(a)trailing-edge.com wrote:
>> Ethan Dicks wrote:
>>
>> >I did spot the obvious format switch on the front of the disk unit, but
no
>> >idea how to use it. I now wish that I'd picked up a couple more boxes
of
>> >media from a friend's business about eight years ago.
>>
>> What part of the world are you in, Ethan?
>
>For the moment, Ohio, but occasionally from various points in the Southern
>Hemisphere.
>
>> Here in North America, new 8" floppies (preformatted, even) are readily
>> available from a number of sources.
>
>I know they are available for enough money. I was lamenting the fact that
I
>could have picked up a bootload for nothing and never had to buy another
disk
>again. I have a case of formatted disks and several cases of used disks
with
>data files from schools and at least one university lab that I can reformat
>and test.
>
>Mostly, I want to be able to extract the data *from* the floppies, not put
>more data *on* them. I hope to stuff an 8" drive from my DataRam Q22 box
>on an old 486 for data recovery, then back up my crate of PDP-8 and PDP-11
>floppies.
>
>-ethan
>
>
>=====
>Infinet has been sold. The domain is going away in February.
>Please send all replies to
>
> erd(a)iname.com
>__________________________________________________
>Do You Yahoo!?
>Bid and sell for free at http://auctions.yahoo.com
Eric wrote:
>Allison wrote about 5.25 inch diskettes with small (35-track) head windows:
>> I have em. Both 10 sector NS* format (no even for $20 I dont give them
>> up) and also some of my TI99/4a likely others that I'd have bought around
>Wow! What brand of diskettes were they? All the NS diskettes I've seen
>have the standard windows, but I think they were just 3M and Verbatim
>diskettes.
The first 5.25" floppies I ever used were actually Shugart brand.
After all, they were the only company selling 5.25" drives at the time.
(Similarly, all my early 8" floppies are IBM brand.)
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
On 29 Sep 1999, somebody who should know better wrote:
] > Yesterday I scooped an AT&T PC 6300 Unix machine on its way
]
] It's not a Unix machine. (Or, at least, not a very good one.)
] Perhaps you're thinking of the 7300?
Well, its former owner called it a 6300 Unix machine, its cover
has "6300 PLUS" printed on it in nice big letters, and the
floppies that I got with it have preprinted labels like this:
AT&T
Unix(R) System V Release 2.0
AT&T Personal Computer
6300 PLUS
What do you think? Is it a 6300 PLUS? Is it a Unix machine?
Maybe it isn't a very good Unix machine. Still, I'd like to get
it to boot and come to my own conclusions. Help is welcome.
Remember people, this is an "oldies" list. If some machine here
isn't fast/good/new enough for you, maybe you accidentally
subscribed to the wrong list? Please try to contain the knee-jerk
put-downs.
Bill.
I've got a van If I may be of any help, let me know
I'm in Burnsville (not too far from John)
Francois
-----Original Message-----
From: Lawrence LeMay <lemay(a)cs.umn.edu>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Monday, October 04, 1999 12:56 PM
Subject: Ahh!
>Holy gods of computing! I just spotted a PDP8/e system thats available!
>
>Its at times like this, that I really wish I had a working car... Ah well,
>I'll have to convince some local friends to help me out. I REALLY want
>a working PDP8/e...
>
>-Lawrence LeMay
>
