Long time readers may recall that about once a year I beg other list
members to see if they have the manual for the Pro-Log M822 8080
analyzer - that quest continues. But I am now the proud owner of a
Pro-Log M824 Z80 analyzer that I snatched up for $15 off ebay. Of
course there was no manual. But now - theoretically - I can add
blinken-lights to both my Sol-20 and my NorthStar Horizon and
single-step to my heart's delight.
So...... are there any list members with the manual / schematic for
EITHER the M822 OR the M824 ????
Bob Stek
Saver of Lost Sols
Anybody want to offer advice on reforming filter
caps? I'm planning to power up some stuff that
hasn't seen voltage in a long time. My plan is
to put several low-wattage light-bulbs in series
with the thing, to limit the amount of current it
will get, and hopefully allow those old caps
to reform instead of, say, exploding in my face.
It would be better to put the light bulbs (or
whatever kind of resistor) in series with the
caps themselves on the secondary side of the
transformer, right? But if I start digging into
the thing's innards like that, there is a real
risk that I'll damage it more than an exploding
cap would. (In one item, there is a picture
tube nearby, and I'm sometimes clumsy...)
Now the questions:
Could putting the light-bulbs (or whatever) in
series on the primary side of the transformer
actually produce the desired effect? IIRC, a
step-down transformer divides the voltage but
multiplies the current. So I'd have to limit the
current on the primary side that much more to
keep the secondary current down, right?
Also, what kinds of things could be damaged by
getting less voltage than they were designed for?
I could imagine hard disks spinning too little to
lift the heads from the surface, for instance.
(This is moot, because there are no hard disks
in any of the equipment I'm looking at.) How
about CRT's? Could too little deflection make
the beam hit something it shouldn't? Anything
else?
Thanks,
Bill.
In an effort to track something down, both cctech and cctalk have
temporarily been put into "all posts must be approved". The net effect is
that traffic on the list will be more "bursty" for a while, as I
periodically check posts and manually approve them all. This change is
temporarily, hopefully no more than a few hours. Everything should be back
to automatic approval by late tonight. Sorry for the inconvenience!
(The approval change for the next few hours, only applies to posts that
normally would NOT need to be approved).
Regards,
Jay West
Hi Folks,
I have to do some reverse-engineering work on an old Z80 based system.
Does anyone know where to find A 64650A GP Preprocessor pod
and a 64853A Z80 personality module
gr.
Luc
Go to David Gesswein's site
http://www.pdp8.net/query_docs/query_all.html
and look under "Teletype", download the "Print Sets which have
full schematics of your 33, and all will be revealed!
As you have discovered, parts of the TTY power supply are on all
the time even if the line/local switch is off...
Mine runs quite hot too, and over the years has discolored the
board beneath it to a well-done dark brown.
-Charles
On Tue, 03 Jun 2003 12:00:01 -0500, you wrote:
>This res. gets hot even when switched off, but just in the socket.
> ____________
> | |
> | (14 O ) | <- large resistor
> | |
> | (220ko)| <\
> | (300ko)| |
> | | |- not sure
> | etc (vr) | |
> | | </
> | _ |
> |||||| ||||||
I am searching for a reasonably priced DEC ADQ32-SF. I have only been able to
find one but the company that has it wants way too much for it. If you have
any resources for this I would greatly appreciate any links, phone numbers,
fax numbers or anything else that you feel may help in my search. Thank you
for your time
Vince Harris
Account Manager
US Computer Exchange Inc.
386 East Maple Road
Troy, MI 48083
248-583-9000 Phone
248-583-9009 Fax
vharris(a)usce.org
Justin,
I came about your mail on an archive-server. Did you resolve your
problem
with the keyboard ?
I think you do have a LK401, but not a Digital/Compaq one but one from
Tektronix. Today I got a request from a customer looking for that
Tektronics
keyboard. But I only have DEC Keyboards. DEC LK401 has alway a 4pin RJ11
connector.
I never came across that Tektronics keyboard before and your Mail was
the
only one stating the Tektronics pratnumber, which is different fron the
DEC one. BTW, the serial# is different, too. The DEC ser# is longer. The
TEK
ser# has only 5 digits while DEC ser# have 10 digits.
Sincerely,
Michael
I'm interested in obtaining one of those "Weird" cables you have.
Can you please either contact me at 757-534-7108 or give me your number so
that we can discuss it further to make sure we are talking about the same
weird cable.
Thanks,
Michael Bauza
CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is
for the sole use of the intended recipient(s) and may contain confidential
and privileged information. Any unauthorized review, use, disclosure or
distribution is prohibited. If you are not the intended recipient, please
contact the sender by reply e-mail and destroy all copies of the original
message.
Hello fellow PDP-8 enthusiasts:
Due to financial considerations, I am forced to sell my PDP-8 collection. I
will be putting individual items up on eBay over the next few weeks.
My current collection includes a straight-8 in the original DEC rack
cabinet, an 8/I, two 8/e's (one 'basic' and one a fully loaded 40-slot
box), a TU-56 dual tape drive, high speed paper tape punch and reader,
80-column drum-style Dataproducts line printer with spare ribbons,
documentation, boards, and paper; RX-01 and RX-02 disk drives, two
PDP-8/a's, and two VT-278's on wheeled pedestals, extra VT-100's and
VT-52's, and more that I have probably forgotten about. Software, maindecs,
documentation, etc. will also be offered.
I plan to hold on the straight-8 until the last possible moment, maybe
forever, and I am negotiating the sale of the 8/I processor, its spare
board set, and documentation, to a private party. I even have a couple
of OLD 11's (an 11/05 is one of them).
I have had this collection for close to 20 years. All my kids learned to
use computers on it, and it has been lots of fun restoring them, writing
software, and building custom hardware for them. I'll miss them, but I do
want to see them go to good homes!
If there is anything you want, let me know and I will put it up first. I
have a LOT of stuff related to these machines, so ask, as I may have what
you are looking for!
Best Regards,
Dave Mahoney
See previous discussions of this on the list.
It is on the order of 10000 DPI. I have two fiche scanners, A 3M
unit that I actually have software for, but requires manual positioning
and a much older automatic unit with no docs or software.
The effective resolution of the output is normally between 200 and 400
DPI after magnification between 20 and 30x.
