On 06/28/2018 12:22 PM, Liam Proven via cctalk wrote:
What amazed me is that none of the NICs blew, none of the
machines failed or died. Once the cabling was sorted, it
was OK. Who knew that BNC Ethernet ports could handle 100V
or more flowing through them and mostly work?
They are galvanical
> From: Eric Smith
> If you _must_ run a long -232 cable
'Don't!' That's what -422 is for. :-)
Noel
On 06/28/2018 01:42 PM, Eric Smith wrote:
> On Thu, Jun 28, 2018 at 2:20 PM, Chuck Guzis via cctalk
> mailto:cctalk@classiccmp.org>> wrote:
>
> So, on a TIA/EIA/RS-232C DB-25 connector, what's the official position
> on pin 1? The standards calls it PGND = Protective ground and most
>
On 2018-06-28 at 13:20:25 -07:00, Chuck Guzis via cctalk wrote:
>
> So, on a TIA/EIA/RS-232C DB-25 connector, what's the official position
> on pin 1? The standards calls it PGND = Protective ground and most
> reference seem to indicate that this is chassis/earth ground at both
> ends of a cable.
On Thu, 28 Jun 2018 at 21:14, Bill Gunshannon via cctalk
wrote:
>
> I realize that, just pointing out that the threat was already well known
> by the 1980's.
Ah, ISWYM now. Sorry. Yes, in that case, you're absolutely right.
--
Liam Proven - Profile: https://about.me/liamproven
Email: lpro...@ci
On Thu, Jun 28, 2018 at 2:20 PM, Chuck Guzis via cctalk <
cctalk@classiccmp.org> wrote:
> So, on a TIA/EIA/RS-232C DB-25 connector, what's the official position
> on pin 1? The standards calls it PGND = Protective ground and most
> reference seem to indicate that this is chassis/earth ground at b
On 06/28/2018 09:45 AM, Eric Smith via cctalk wrote:
> Of course, this isn't specific to Ethernet. It can happen with e.g.
> TIA/EIA-232 (formerly RS-232) as well, and in fact that is even more common
> in practice, because Ethernet is transformer-isolated at each station, but
> TIA/EIA-232 is usu
On 06/28/2018 02:37 PM, Liam Proven wrote:
> On Thu, 28 Jun 2018 at 20:13, Bill Gunshannon via cctalk
> wrote:
>
>> The US Electrical Code has not allowed any kind of signal wire in
>> the same conduit with any kind of power wiring for as far back as
>> I can remember.
> Sounds very sensible, bu
On Thu, 28 Jun 2018 at 20:13, Bill Gunshannon via cctalk
wrote:
>
> The US Electrical Code has not allowed any kind of signal wire in
> the same conduit with any kind of power wiring for as far back as
> I can remember.
Sounds very sensible, but the Isle of Man isn't part of the USA, nor
even pa
On 06/28/2018 01:22 PM, Liam Proven via cctalk wrote:
> On Thu, 28 Jun 2018 at 18:45, Eric Smith via cctalk
> wrote:
>> In case it may not be obvious to some readers, the reason you should NEVER
>> ground an Ethernet cable (of any kind) at two points is that the ground
>> potential at two differ
On Thu, 28 Jun 2018 at 18:45, Eric Smith via cctalk
wrote:
>
> In case it may not be obvious to some readers, the reason you should NEVER
> ground an Ethernet cable (of any kind) at two points is that the ground
> potential at two different points is unlikely to be the same, so that will
> cause a
On Thu, Jun 28, 2018 at 7:18 AM, Paul Koning via cctalk <
cctalk@classiccmp.org> wrote:
> > On Jun 28, 2018, at 4:52 AM, Peter Coghlan via cctalk <
> cctalk@classiccmp.org> wrote:
> > On a slightly different point, didn't the thickwire spec call for the
> outer
> > conductor of the cable to be ear
Thanks for the clarifications, Paul!
Indeed, some thinnet devices do have terminators built in. On a fair bit of
Allied Telesyn gear, there's a switch for it.
Thanks,
Jonathan
On Thu, Jun 28, 2018 at 9:18 AM, Paul Koning via cctalk <
cctalk@classiccmp.org> wrote:
>
>
> > On Jun 28, 2018, at 4:5
> On Jun 28, 2018, at 4:52 AM, Peter Coghlan via cctalk
> wrote:
>
> On 2018-06-27 19:34:38 -07:00, Chuck Guzis via cctalk wrote:
>> On 06/27/2018 04:19 PM, Antonio Carlini via cctalk wrote:
>>
>>> No idea. But on thickwire the taps were all supposed to be made at
>>> specifically marked pos
Thinnet is supposed to be grounded at one point, and only one point, as
well. Supposedly that's what the chain on some terminators is for. Some
hubs have a grounding and termination option built in. I don't know offhand
if this was specced in the standard or not. Of course, this often wasn't
follow
Oops. *Roswell not Atlanta.
Sent from my Apple /c
> On Jun 28, 2018, at 7:15 AM, Sam O'nella wrote:
>
> It's Lonnie in Atlanta. Spoken to him a few times in email and he/they are a
> serious investor in computer history. They also helped vintage computer
> festival southeast get a locat
I don’t recall if I had any 3880 documents. I will ask how they would like to
handle this type of request. There are many duplicates and they will need time
to catalog the documents.
It's Lonnie in Atlanta. Spoken to him a few times in email and he/they are a
serious investor in computer history. They also helped vintage computer
festival southeast get a location originally.
It's a good home for that gear.
Sent from my Apple /c
> On Jun 28, 2018, at 2:55 AM, Christi
I don’t think so.
On 2018-06-27 19:34:38 -07:00, Chuck Guzis via cctalk wrote:
> On 06/27/2018 04:19 PM, Antonio Carlini via cctalk wrote:
>
> > No idea. But on thickwire the taps were all supposed to be made at
> > specifically marked positions (for the reason given earlier).
> > Perhaps someone (incorrectly) thoug
On Wed, 27 Jun 2018, Donald wrote:
The whole collection went to
Computer Museum of America in Roswell, GA
https://computermuseumofamerica.org/
Is that the museum that formerly was in San Diego?
Christian
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