On 2022-Mar-28, at 4:07 PM, Noel Chiappa via cctalk wrote:
>> I don't think the CPU is working at all. The reason being that there is
>> absolutely no LED activity. Including an LED that is supposed to indicate
>> a clock.
>
> Looking at the KDF11-U prints, I finally found that LED (it's pretty
On 3/28/22 21:55, Jon Elson wrote:
On 3/28/22 17:22, Rob Jarratt via cctalk wrote:
Its 600mV, but it is more of a spike than a ripple.
That's probably not real. It looks like noise pickup from
the probe ground lead. Try disconnecting the probe tip
and see if you still get similar signals.
sad news to hear
On Mon, Mar 28, 2022 at 8:48 PM Murray McCullough via cctalk <
cctalk@classiccmp.org> wrote:
> Without getting political I was saddened to hear of the destruction of the
> Club 8-Bit museum in Mariupol, Ukraine. One can only hope that D.
> Cherepanov can rebuild his museum
Without getting political I was saddened to hear of the destruction of the
Club 8-Bit museum in Mariupol, Ukraine. One can only hope that D.
Cherepanov can rebuild his museum someday keeping classic computing in that
part of the world alive.
Murray--
On 28/03/2022 23:22, Rob Jarratt via cctalk wrote:
> Its 600mV, but it is more of a spike than a ripple. Here is a trace:
> https://rjarratt.files.wordpress.com/2022/03/pin-1-5v-ripple.jpg
>
I think that's just switching noise. You appear to be zoomed in on the
point where the main switching
I have been reluctant to put everything back in, in case the PSU fries
something. And the ripple I noticed is...
For the record, right now I have only the M7133, M7134 and G7273 installed.
Ok, I do recall that my 11/24 wasn't doing any ODT without some form of
memory. When I configured a
On 2022-03-28 6:34 p.m., Grant Taylor via cctalk wrote:
On 3/27/22 8:50 PM, Toby Thain via cctalk wrote:
Hi,
Hi Toby,
Digital Networks & Communications Buyer's Guide 1987 April-June
Can I get a bit more of a description as to what might be in that document?
I've got an (unhealthy)
> From: "Rob Jarratt"
> Thanks for the lengthy reply.
Glad to help - or try to.
> As an aside I have also been trying to find a fault on a Pro 350 which
> uses the same CPU chipset. I have a pinout but no datasheet.
There doesn't seem to be as lot on the F-11 set. I looked in
On 3/28/22 12:09 PM, Nigel Johnson Ham via cctalk wrote:
OK, it was wireless, but that brings up another surprise, that wireless
ethernet came before wired :-)
As others have indicated, I think not. ;-)
I recently watched the following videos of Bob Metcalfe:
- Link - Ethernet Briefings in
On 3/27/22 8:50 PM, Toby Thain via cctalk wrote:
Hi,
Hi Toby,
Digital Networks & Communications Buyer's Guide 1987 April-June
Can I get a bit more of a description as to what might be in that document?
I've got an (unhealthy) interest in old networking equipment and might
be interested
Its 600mV, but it is more of a spike than a ripple. Here is a trace:
https://rjarratt.files.wordpress.com/2022/03/pin-1-5v-ripple.jpg
Regards
Rob
> -Original Message-
> From: Wayne S
> Sent: 28 March 2022 23:15
> To: r...@jarratt.me.uk; Rob Jarratt ; General
> Discussion: On-Topic and
> -Original Message-
> From: cctalk On Behalf Of Chris Zach via
> cctalk
> Sent: 28 March 2022 20:57
> To: cctalk@classiccmp.org
> Subject: Re: PDP 11/24 - A Step Backwards
>
> > I don't think the CPU is working at all. The reason being that there
> > is absolutely no LED activity.
Awesome! Congrats to everyone involved!
Marc
> On Mar 28, 2022, at 12:24 PM, js--- via cctalk wrote:
>
>
>> On 2022-02-25 16:09, js--- via cctalk wrote:
>>
>> Hi, folks.
>>
>> I've a HP 9915A computer with an interesting problem. The motherboard
>> utilizes a ceramic Intel D8048 chip.
On 2022-03-28 15:49, Jonathan Chapman via cctalk wrote:
What surprises me (a little) is that there is a commercial outfit
willing to work on something so old.
It's essentially what we do. I doubt there's a directory of all the small shops
that work on legacy equipment,
but consider that some
I don't think the CPU is working at all. The reason being that there is
absolutely no LED activity. Including an LED that is supposed to indicate a
clock. Having hopefully eliminated all the power voltages it left me
wondering if there was a fault on the CPU or in the PSU. Having had activity
on
> -Original Message-
> From: cctalk On Behalf Of Antonio Carlini
> via cctalk
> Sent: 28 March 2022 07:50
> To: cctalk@classiccmp.org
> Subject: Re: PDP 11/24 - A Step Backwards
>
> On 28/03/2022 04:57, Tony Duell via cctalk wrote:
> >
> > Very little of the stuff I've bought new has
> -Original Message-
> From: cctalk On Behalf Of Chris Zach via
> cctalk
> Sent: 27 March 2022 19:48
> To: cctalk@classiccmp.org
> Subject: Re: PDP 11/24 - A Step Backwards
>
> Bigger question is who repaired the power supply "under warranty"?
A company called Radwell International.
> What surprises me (a little) is that there is a commercial outfit
> willing to work on something so old.
It's essentially what we do. I doubt there's a directory of all the small shops
that work on legacy equipment, but consider that some of this stuff runs CNC
machines that are still in use.
Thanks for the lengthy reply. Some responses inline below.
> -Original Message-
> From: Noel Chiappa
> Sent: 27 March 2022 21:09
> To: cctalk@classiccmp.org
> Cc: j...@mercury.lcs.mit.edu
> Subject: RE: PDP 11/24 - A Step Backwards
>
> > From: Rob Jarratt
>
> > today I went
On 2022-02-25 16:09, js--- via cctalk
wrote:
Hi, folks.
I've a HP 9915A computer with an
interesting problem. The motherboard
utilizes a ceramic Intel D8048 chip.
The problem is that this 8048 has a
crack right across the top middle of
it, and half of the top of the chip
has
> On Mar 28, 2022, at 2:12 PM, Joseph S. Barrera III via cctalk
> wrote:
>
> That was the ALOHA network, which inspired Ethernet but was not Ethernet.
The differences are quite crucial. ALOHA is a broadcast radio packet network,
which doesn't have collision detect and probably not carrier
That was the ALOHA network, which inspired Ethernet but was not Ethernet.
On Mon, Mar 28, 2022 at 11:09 AM Nigel Johnson Ham via cctalk <
cctalk@classiccmp.org> wrote:
> For years I taught my students that the Ethernet was invented at the
> University of Hawaii in 1971!
>
> OK, it was wireless,
For years I taught my students that the Ethernet was invented at the
University of Hawaii in 1971!
OK, it was wireless, but that brings up another surprise, that wireless
ethernet came before wired :-)
cheers,
Nigel
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the
Ethernet invented in 1973-74 at Xerox PARC in Palo Alto, CA, evolved over
many years.
This April 13th Webinar will trace the history and development of Ethernet
as a 10 Mb/s product up through the release of the DIX (DEC-Intel-Xerox)
spec in 1980. This was the starting point for the ongoing
On 28/03/2022 04:57, Tony Duell via cctalk wrote:
Very little of the stuff I've bought new has had such seals (with some
things, like my audio equipment, you are _expected_ to remove the
covers, the user manuals tell you how. They also include the full
schematics). Ditto test gear (if there is
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