On Fri, Aug 16, 2019, 10:56 PM Ethan Dicks via cctalk
wrote:
> On Sat, Aug 17, 2019 at 12:12 AM Charles via cctalk
> wrote:
> > Is there any standard pinout for 20 ma current loop using a DB-25
> connector,
> > analogous to the well-documents RS-232 serial interface?
>
> From checking a couple o
On Sat, Aug 17, 2019 at 12:12 AM Charles via cctalk
wrote:
> Is there any standard pinout for 20 ma current loop using a DB-25 connector,
> analogous to the well-documents RS-232 serial interface?
>From checking a couple of devices, I don't think so. Here's how the
original IBM Async adapter for
Is there any standard pinout for 20 ma current loop using a DB-25 connector,
analogous to the well-documents RS-232 serial interface?
My PDP-8/A drives an ASR-33, and having just restored an ADM-3A I want to be
able to unplug the TTY and plug in the ADM.
I somewhat arbitrarily put the transmit
As Jon said, from my analysis of busted-apart DEC connectors, there's a
selectively plated "pad" where the contact surface actually is.
I wouldn't be surprised if the bulk of the contact fingers is *phosphor
bronze* which is often used in springs. Perhaps we can get Connor to do a
metallurgical an
On 08/16/2019 05:59 PM, Noel Chiappa via cctalk wrote:
> From: Brent Hilpert
> I've seen pieces of HP high-end lab equipment from thru the 60s that
> used tin plating on the PCB edge fingers, mating into gold-plated edge
> connectors on the backplane.
ISTR that DEC used bron
I have 2 RXV21 RX02 controller boards. They were bought to be used with
the RX02 emulator, the one on github by AK6DN.
Finally, I finished one of the emulator boards and tried it out on a
PDP-11/03 and found that one of the RXV21 boards worked and the other
didn't. I assumed the one board w
I am still struggling with my ADM-5. The smoke I mentioned last time came
from a tantalum capacitor decoupling a -20V supply. After removing it, I
got back to the monitor showing a cursor.
Interesting you should mention that... early in the debugging process
(always start with the power suppl
Charles wrote:
> Today the replacement 'LS193 arrived, so I put it in the
> previously-installed socket and the screen is now 24x80 again :)
> I'd been testing with the dip switch in half-duplex mode... For final test,
> I put it in FDX, connected to my HP protocol analyzer, and what do you know,
> Then imagine that a law is passed in a far away land, and the site owner
> decides it's is too risky to bother with, and they then take the entire
> site down - wiki and fora - with no warning and no access to the material...
Gosh, Steven, I can't imagine for the *life of me* what site you're
> > I assume he knew what he was talking about (via his Web-site engineering
> > people). I suppose I could research it, but I don't have the time right
> > at the moment. I'd love to hear if anyone else knows more.
>
> It is true. Google now marks any site that is not using HTTPS as
> "insecure",
I found a newer version of the tech manual on bitsavers, which does mention
the mysterious S8 switch (as well as the S6 switch that fills the screen
with 0's upon clearing).
"The gated EXTENSION port mode, when selected
by switch S8, allows selective transmission of
data from the keyboard, in H
> From: Brent Hilpert
> I've seen pieces of HP high-end lab equipment from thru the 60s that
> used tin plating on the PCB edge fingers, mating into gold-plated edge
> connectors on the backplane.
ISTR that DEC used bronze contacts in their backplanes, but basically all the
boards
On 8/16/19 5:46 PM, Brent Hilpert via cctalk wrote:
> On 2019-Aug-16, at 11:56 AM, systems_glitch via cctalk wrote:
>> On Fri, Aug 16, 2019 at 2:53 PM Paul Koning wrote:
>>>
On Aug 16, 2019, at 2:43 PM, systems_glitch via cctalk <
I'm sure DEC wouldn't have bothered with hard gold p
That *is* surprising, HP sometimes gold plated the whole thing!
In any case, I will continue to run edge connectors with the superior
albeit more expensive selective hard gold process :P
Thanks,
Jonathan
On Fri, Aug 16, 2019 at 5:46 PM Brent Hilpert via cctalk <
cctalk@classiccmp.org> wrote:
>
On 2019-Aug-16, at 11:56 AM, systems_glitch via cctalk wrote:
> On Fri, Aug 16, 2019 at 2:53 PM Paul Koning wrote:
>>
>>> On Aug 16, 2019, at 2:43 PM, systems_glitch via cctalk <
>>>
>>> I'm sure DEC wouldn't have bothered with hard gold plating if their
>>> connectors were metallurgically incom
On 8/16/2019 12:53 PM, Paul Koning via cctalk wrote:
From what I remember, the detailed analysis involves an "electrochemical
series", which has metals like sodium at one end, copper closer to the middle, and
gold at or near the other end. Metals are compatible if their potential value diffe
Today the replacement 'LS193 arrived, so I put it in the
previously-installed socket and the screen is now 24x80 again :)
I'd been testing with the dip switch in half-duplex mode... For final test,
I put it in FDX, connected to my HP protocol analyzer, and what do you know,
no serial data out.
T
You can look it up in an electronegativity chart for a quick "will these
ruin each other" check.
I think a lot of this comes from the SIMM era in PCs, where folks were told
to only use gold-flash SIMMs in gold sockets, and only tin plated SIMMs in
tin plated sockets.
Thanks,
Jonathan
On Fri, Aug
> On Aug 16, 2019, at 2:43 PM, systems_glitch via cctalk
> wrote:
>
> I'm sure DEC wouldn't have bothered with hard gold plating if their
> connectors were metallurgically incompatible :P The few busted DEC
> connectors I've replaced did indeed have selective gold plating on the
> contact sur
I'm sure DEC wouldn't have bothered with hard gold plating if their
connectors were metallurgically incompatible :P The few busted DEC
connectors I've replaced did indeed have selective gold plating on the
contact surfaces. Most quality edge connector slots are similarly
constructed.
Thanks,
Jonat
On 8/16/2019 12:13 PM, systems_glitch via cctalk wrote:
Dwight,
I spot check boards. I lack sufficiently sensitive instruments to measure
actual thickness (even on a surface plate, it's the same for ENIG as hard
gold with an 0.0001" indicator) but ENIG won't stand up to a few swipes
with an ink
One of the problems with archiving is what to do with items that are not
popular. Some things might be more valued ten or twenty years in the future but
not now. Is the fact that the item has relatively low interest now a possible
reason to not archive it in a searchable form for future referenc
Dwight,
I spot check boards. I lack sufficiently sensitive instruments to measure
actual thickness (even on a surface plate, it's the same for ENIG as hard
gold with an 0.0001" indicator) but ENIG won't stand up to a few swipes
with an ink eraser, whereas hard gold will stand up to it no problem.
On Fri, Aug 16, 2019 at 02:21:36AM -0400, Noel Chiappa via cctalk
wrote:
[...]
> Yeah, I added "CHWiki" to the text on the Main Page to make it a
> little easier
Because of curiosity, I tried.
On gog:
=== chwiki - because gog discovers I type from Poland and "chwiki"
looks like Polish word "chw
On 8/16/2019 1:50 AM, Christian Corti via cctalk wrote:
On Thu, 15 Aug 2019, Noel Chiappa wrote:
An additional issue, I think, is that Google is deprecating sites that
use
HTTP, versus HTTPS. I can't comment more, lest I start ranting at the
utter
Not true, in contrary, Google even crawls thr
I was wondering, does anyone check the thickness of the gold plating anymore.
Years ago, working at another large company, we saw quite a bit of cheating on
this.
Trust but verity.
Dwight
From: cctalk on behalf of Dennis Boone via
cctalk
Sent: Friday, August 1
> I've gotten the distinct impression that US board houses really are
> only interested in government/military/aerospace work. I've often
> wondered what it would take to set up a modern "no human interaction"
> line and if one could be even a little competitive with the Chinese
> on it.
Base
Noel Chiappa via cctalk writes:
> I assume he knew what he was talking about (via his Web-site engineering
> people). I suppose I could research it, but I don't have the time right
> at the moment. I'd love to hear if anyone else knows more.
It is true. Google now marks any site that is not usi
Indeed, when I tried to get quotes for the first XT-IDE run, the best
US-based quote I got was around $15/board with a *16 WEEK* lead time.
Compare to my usual "does good hard gold" shop in China, PCB Cart, at
$8/board (final all-in cost) and 12 day lead time, including the initial
tooling fees. PC
> From: Steven M Jones
> imagine that a law is passed in a far away land, and the site owner
> decides it's is too risky to bother with, and they then take the entire
> site down - wiki and fora - with no warning and no access to the
> material...
> ..
> I would strongl
Paul Koning via cctalk writes:
> Anything worth having around deserves backup. Which makes me wonder
> -- how is Wikipedia backed up? I guess it has a fork, which isn't
> quite the same thing. I know Bitsavers is replicated in a number of
> places. And one argument in favor of GIT is that ev
On 08/16/2019 08:59 AM, systems_glitch via cctalk wrote:
Paul,
I've got a board house I usually use, but if I can find a shop in the USA
that will do hard gold plating and provide a comparable cost-per-board, I'd
certainly switch!
There are few board houses in the US anymore, and they are
usu
On 08/16/2019 02:50 AM, Christian Corti via cctalk wrote:
On Thu, 15 Aug 2019, Noel Chiappa wrote:
An additional issue, I think, is that Google is
deprecating sites that use
HTTP, versus HTTPS. I can't comment more, lest I start
ranting at the utter
Not true, in contrary, Google even crawls t
On 8/15/19 11:21 PM, emanuel stiebler via cctalk wrote:
> Is this the same, Al is using?
> (can't find the reference anymore)
>
>
The scanning info is on the main bitsavers.org page
I'm still using a Panasonic KV-S3065CW
I checked the backlog of scanned VAX manuals, and it doesn't
look like
> From: Christian Corti
>> An additional issue, I think, is that Google is deprecating sites that
>> use HTTP, versus HTTPS.
> Not true, in contrary, Google even crawls through FTP sites :-)
I did say "deprecate", not 'ignore totally'! :-)
Here's what I know: An e-commerce site
Paul,
I've got a board house I usually use, but if I can find a shop in the USA
that will do hard gold plating and provide a comparable cost-per-board, I'd
certainly switch!
Thanks,
Jonathan
On Fri, Aug 16, 2019 at 12:55 AM Paul Anderson wrote:
> Hi Jonathan,
>
> If you are looking for someone
> On Aug 16, 2019, at 6:14 AM, Steven M Jones via cctalk
> wrote:
>
> On 08/15/2019 23:21, Noel Chiappa via cctalk wrote:
>> I have on several occasions posted appeals to this list for people to
>> contribute content to it, and gotten almost no response (with one notable
>> exception), in ter
>
> Date: Wed, 14 Aug 2019 12:06:48 -0400
> From: Curt Vendel
> To: cctalk@classiccmp.org
> Subject: Re: cctalk Digest, Vol 59, Issue 13
>
> Will...
>
> I?m still waiting for you and the Rhode Island Computer Society to get my
> brand new in the box 9766, the Alignment disk platter, the box of spa
On 08/15/2019 23:21, Noel Chiappa via cctalk wrote:
I have on several occasions posted appeals to this list for people to
contribute content to it, and gotten almost no response (with one notable
exception), in terms of added content; that was a large part of why I merely
mentioned it in an offh
I think I already booked didn't I?
Regards
Rob
> -Original Message-
> From: cctalk On Behalf Of mark--- via
cctalk
> Sent: 16 August 2019 08:17
> To: 'General Discussion: On-Topic and Off-Topic Posts'
>
> Subject: Event Reminder: DEC Legacy is back on 9th-10th Nov 2019,
> Windermere UK
On Thu, 15 Aug 2019, Noel Chiappa wrote:
An additional issue, I think, is that Google is deprecating sites that use
HTTP, versus HTTPS. I can't comment more, lest I start ranting at the utter
Not true, in contrary, Google even crawls through FTP sites :-)
Christian
Just a quick reminder for those folk thinking about registering...
The next DEC Legacy will take place Saturday 9th November 2019 - Sunday 10th
at the Marchesi Centre in Windermere, North West UK.
With a focus on Digital Equipment Corporation and their legacy of hardware,
software and ethos I'm
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