Hi Dwight,
I've been looking for examples/labs that would take me through the correct
procedure to setup/operate a GP-10 analog computer. I found your email in a
discussion about the GP-6 along with links to two labs on how to use it. They
seem pretty good except for a few details that probably apply specifically to
the GP-6.
Thanks,
Matt
Matthew Wadham-Gagnon
McGill University, Montreal
Mechanical Engineering, Honours
> --- jamesd <jdickens(a)ameritech.net> wrote:
> > Hi new to list... just won a SUN 4/690mp...
> >
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3027472460&category=1121…
>
> Wahoo!
Not quite my reaction after looking at what he got, mine is OUCH! My
advice, ask the seller how much he'll charge you to keep it. Do you realize
how big and HEAVY that stuff is?!?! OTOH, if you did realize what you were
bidding on, congrantulations, you got it for a killer price :^)
What can I say, big Unix boxes for hobbyist use scare me, I'd much rather
have a nice small modernish 2-4 processor Unix workstation.
Zane
Hi, all..
( Gee, I get to ask a legitimate classic comp question.. )
Anyways, I've a A2GS sitting here, that I've been beating myself over
the head with for about two days now.. (Yes, I'm stubborn)
I've been trying to get ADT (serial) working between the GS, and my PC.
I've gotten it to work just fine PC -> GS. (I even had my PC type a
copy of Dos3.3/ADT/ADTgs in via the serial port at 300baud.)
Anyways the stumper is in the GS -> PC direction. Nothing works. I've
tried the modem port on the GS, as well as 2 different super serial
cards.
I finally got desperate enough to pull out a RS-232 break out box, and a
scope. (Plus a couple of dweebie basic programs) What I find is the
Apple serial communications looks like its running at about +/- 4v.
(This is on the builtin modem port. I can't get a SSC to work either.)
(The waveform also appears to have a fair amount of ring on the voltage
swings, but that may be normal)
I'm guessing that the +/-4volts isn't enough for my PC to recognize it.
Question #1:
Does anyone have any thoughts about my theory that the PSU is weak, or
suggestions where else to look?
Question #2:
Presuming question #1 is reasonable, schematics for a GS PSU?
Thanks,
David
Hello Jules,
> ZIF-socketed card ("unknown_04.jpg" on the website): The ZIF socket
> is a 28-pin unit. I'd say it was a programmer, but wouldn't it need
> an external 24V (??) supply if that were true?
Looks like the Vpp generator is on the far right below the multiturn
pot. It will be something like TL497.
> The 40-pin chip is marked as "S6821P", whatever one of those is.
68xx series paralell I/O chip.
> The first 3 of the switches are labelled as '16', the next 3
> as '32' and the last 4 (overlapping by 1 with the previous 3) as '64'.
First three on for 2716, next 3 on for 2732 and the last 4 on for 2764.
> Card with 8 LEDs and 4 empty 16-pin DIL sockets ("unknown_02.jpg" on the
> website): Any ideas?
Looks like a digital I/O card. The 6522s are also paralell I/O chips.
Leads to the outside world would plug into the DIL sockets.
Cheers,
Lee.
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I just aquired (won on ebay, totally forgot I bid on it), a pretty neat
little Apple item I never knew existed.
Its an RGB -> NTSC modulator for the Apple IIc. It also came with a
game/TV switch box, but I don't know if that was originally part of the
package, or just a seperate item that was included in the auction.
I've never seen this little device before, and had no idea it existed.
There doesn't seem to be too much about it online.
Has anyone else ever seen or used one of these? I'm just curous really as
there isn't much to know or learn about it. It looks like it will only
fit the IIc (it has a big lump on it that prevents it from installing on
anything else without a cable). And the device is pretty self explanitory
in how it works.
I was able to figure out from the part numbers and a little searching
that I believe this is the NTSC version. There is also a PAL version (any
others?).
This one appears to be almost brand new. There is zero discoloration and
other than slight scratches from screws on the leads to the TV/Game
switch box, there is no marring at all.
-chris
<http://www.mythtech.net>
I have come across what seems to be a remote outlet/power sequencer device
>from the Systems Enhancement Corporation called the Power Administrator 800.
On the rear it has two DB-9 male ports, which I assume can be used to program
this device. It also has an Ethernet port and a few RJ-11 ports labeled "IN",
"R1," and "R2." Additionally, a DB-15f port with the label "out" exists. I
have tried to connect to the device using 9600/8/N/1 over the two serial ports
(DB-9) using both a straight and null-modem cable, but my terminal emulator
senses nothing. A bank of 8 dip switches exists with the label "config." I
contacted the manufacturer, but they claim all of this information is archived
and they do not have access to it. Does anyone have any ideas on how to
communicate with this device? It powers on and supplies electricity to its
six receptacles.
Thanks,
Geoff
Hi
I find it hard to believe that he'll come up with
1/2 mil to pay for this if he is willing to write poetry
for $1. Other than the fact that the seller has a
reasonable record, the sale sure seems funny.
Most other auctions that sell high value items require
the buyers to post a bond. It doesn't sound like this
guy could post a parking ticket bond.
Still, if this was truly one of the original prototypes,
it is in some sense priceless. I don't know if the reason
given for removing the transmitter is valid. My undestanding
was that the circuit was quite simple and didn't require
significant secret circuits. It would be more likely that,
like our own NASA, even prototype items were often used
in real missions to save cost.
Dwight
>From: "Frank McConnell" <fmc(a)reanimators.org>
>
>Ethan Dicks <erd_6502(a)yahoo.com> wrote:
>> --- Kevin Handy <kth(a)srv.net> wrote:
>> > Ethan Dicks wrote:
>>
>> > The current bid is $500,700 (way above the buy-it-now price it
>> > originally had), so your bid of 25K is far short of the goal.
>>
>> Holy Sh*t, Batman! It was $25K the last time I looked (4 bids or
>> so).
>>
>> That is beyond absurd.
>
>The current high bidder, urban-motion, has another auction up with
>this in the description:
>
> I am a 27 year old father with a newborn daughter and bills to
> pay. I work one full time and one part time job totalling 40-60
> hours a week and I love to write in my spare time. To help
> supplement our income I sell a variety of things on Ebay and look
> for creative ways to honestly make a buck. So, I thought that I
> could write original poetry for you and also increase your
> feedback rating at the same time. By purchasing this auction, I
> will write you an original poem and leave you wonderful positive
> feedback.
>
> The poem will be completely 100% original and will be emailed to
> you within 24 hours of payment. Feedback will be left as soon as I
> receive payment.
>
> Payment is accepted through paypal only using any major credit
> card.
>
> Thanks for looking and god bless!!!!!
>
>I am not making this up, you can see it yourself at:
>
><http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2932949148>
>
>-Frank McConnell
I already have copies of those, and IIRC, they don't have any specs on the
control 'messages' passed between things, a PROM dump, or anything else
that is helpful for figuring out how to send commands to the drive.
---
Sounds like Tony has figured this out already to build the test box.
Would you be willing to publish the info that you've figured out, Tony?
---
Ethan Dicks <erd_6502(a)yahoo.com> wrote:
> --- Kevin Handy <kth(a)srv.net> wrote:
> > Ethan Dicks wrote:
>
> > The current bid is $500,700 (way above the buy-it-now price it
> > originally had), so your bid of 25K is far short of the goal.
>
> Holy Sh*t, Batman! It was $25K the last time I looked (4 bids or
> so).
>
> That is beyond absurd.
The current high bidder, urban-motion, has another auction up with
this in the description:
I am a 27 year old father with a newborn daughter and bills to
pay. I work one full time and one part time job totalling 40-60
hours a week and I love to write in my spare time. To help
supplement our income I sell a variety of things on Ebay and look
for creative ways to honestly make a buck. So, I thought that I
could write original poetry for you and also increase your
feedback rating at the same time. By purchasing this auction, I
will write you an original poem and leave you wonderful positive
feedback.
The poem will be completely 100% original and will be emailed to
you within 24 hours of payment. Feedback will be left as soon as I
receive payment.
Payment is accepted through paypal only using any major credit
card.
Thanks for looking and god bless!!!!!
I am not making this up, you can see it yourself at:
<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2932949148>
-Frank McConnell
On Jun 4, 11:43, Ethan Dicks wrote:
> According to the specs I read, there's different insertion forces
> for different models of pins - spring tension in the pin body itself.
So there are -- three different ones in fact, though only on one
series, mainly to accomodate large differences in the number of
contacts per housing, as you said. Despite using the catalogue from
time to time, I'd not appreciated that before.
--
Pete Peter Turnbull
Network Manager
University of York
On Jun 4, 6:23, Ethan Dicks wrote:
> --- Peter Turnbull <pete(a)dunnington.u-net.com> wrote:
> > Most of the cables I've seen on these were made up using 2x5-way
Berg
> > connectors and individual Bergcon crimp pins.
>
> AFAIK, the connectors for a DLV11-J are 2x7-way... There are only
nine
> pins (one is missing for keying), but the extra bits help you center
> the connector. 2x5 will work, if you don't miss.
No, the DEC spec says 2x5. The connectors are AMP connectors; the ones
on the DLV11-J itself are 87272-8 and the ones on a BC21B cable (for
example) are 87133-5. You can fit a Bergcon 2x7 if you push hard, but
it distorts the shroud slightly. All the cables I've ever seen,
including original DEC, are 2x5 housings. If the key is in place, you
can't really miss.
> > You can still get them, but the pins are horrendously expensive in
small
> > quantities.
>
> No kidding. One other "problem" is that you need to stock one set of
> pins for small connectors (like the DLV11-J) and another set of pins
> for large connectors (like an RL8A - 40 pins) because there are
different
> mating forces. Yes, you can use the "wrong" pins, but they were
spec'ed
> different for a reason. "Weak" pins in a small connector might not
> grab enough to stay in well enough, and "strong" pins in a large
connector
> might be too difficult to insert.
Well, that's not "weak" and "strong" by design, it's for different
sizes of square pins, or for round pins. Yes, I agree, don't use the
wrong ones!
--
Pete Peter Turnbull
Network Manager
University of York
On Jun 3, 10:56, John A. Dundas III wrote:
> Stuart,
>
> At 11:53 PM -0700 6/2/03, Jochen Kunz wrote:
> >On 2003.06.03 02:16 Stuart Johnson wrote:
> >
> >> Does anyone have a couple (2) of the AMP 10 pin connectors (with
> >> unused pins) used with the DLV-11J 4 port serial I/O boards or
> >> know where I could purchase them?
> >Aren't this very common 10 pin IDC connectors? At least on my
DLV-11J
> >clone from Sigma Systems. I used the usual 10 pin crimp connectors
for
> >ribbon cable to make the cables.
>
> I have a -J that I'd like to make work and I don't have cables
either. I
> might get a chance to try Jochen's suggestion this weekend, but not
before.
> If you find a solution, please post.
Most of the cables I've seen on these were made up using 2x5-way Berg
connectors and individual Bergcon crimp pins. You can still get them,
but the pins are horrendously expensive in small quantities. However,
lots of other manufacturers now make similar conectors (two rows, on a
0.1" pitch (2.54mm not 2.5mm)). I've used ones made by Molex (C-Grid
III 90142 series, cut off the polarising lug) and Harwin (M20-1071000).
Those numbers are from a quick glance at a catalogue so check them
before you buy a whole lot! Tyco/Amp make something similar, 87456-6
is a 2x5 way housing with various gold-plated or tinned crimp pins to
fit.
I get mine from Farnell in the UK, but I'm sure you'd be able to get
something from any of the usual US suppliers.
BTW, if you make up your own DLV11-J cables, don't forget the shorting
link or it won't work reliably (if at all)!
--
Pete Peter Turnbull
Network Manager
University of York
Tony Duell wrote:
>That was one of the 'problems in the Teletype' that I was thinking of. I
>suspsect the easiest kludge for this these days is to fiddle with the
>clock at the computer interface end, and run the whole thing at 91.667 baud
>
>-tony
91 baud! That is way too slow. I could live with 110 baud, but not 91 baud.
My Selectric terminal used a speedy 134.5 baud.
Michael Holley
www.swtpc.com/mholley
Hi all,
I'm new here - so I hope I'm not breaching any etiquette by posting
this. I have a couple of new boxed ribbons for the following printer list...
Binder 1550, 8510, 8510A
C.Itoh 1550, 8510, 8510A, Prowriter 7500
DEC CLA 45-14602, LA50
HP 85
Leading Edge Prowriter 2-1550 8150AP
NCR 6411
NEC PC 8023A/B/C
Toshiba P1150, PA7251, PA7252
These are FREE (via an SAE to the UK). If you have any of the above
equipment and are interested, please email me directly at elec37(a)york.ac.uk.
Cheers now,
Ben
~~~
Computer Recycling Project
University of York, UK
www.comprec.org.uk
Hi All,
I have an old 9000 R332 (rackmount 300 series machine with built in
monitor).
It looks as though the display has an array of LED's and photo diodes for a
touch screen setup.
How do I get the touch screen to work?
Do I need some additional sofware to do this?
Cheers
Peter
_________________________________________________________________
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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
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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
