People who used to do watches. Similar size issues.
On April 25, 2023 3:38:16 PM GMT+02:00, Paul Koning via cctalk
wrote:
>
>
>> On Apr 25, 2023, at 9:25 AM, KenUnix via cctalk
>> wrote:
>>
>> Rod,
>>
>> Never heard the singing. Switch room's were too noisy.
>>
>> It always amazed me that
On 4/25/23 10:46, Paul Berger via cctalk wrote:
> IBM did develop a machine to thread the wires through cores. The cores
> where held in place in a tray by vacuum and wires threaded through by
> hollow needles to quote the book IBM's Early Computers, "When introduced
> in 1959, this core
IBM did develop a machine to thread the wires through cores. The cores
where held in place in a tray by vacuum and wires threaded through by
hollow needles to quote the book IBM's Early Computers, "When introduced
in 1959, this core threading machine reduced the time to thread X and Y
wires
> On Apr 25, 2023, at 9:37 AM, Rod Bartlett via cctalk
> wrote:
>
> Ken,
>
> Core places being hand wired amazed me as well. The maintenance panels on
> the Honeywell mainframes were hand wired as well. They were works of art
> with lots of toggle switches and lights (the later models
Yep. Back then it was a form of non-volatile memory. Maintained what was on
it after power off.
Ken
On Tue, Apr 25, 2023 at 9:38 AM Paul Koning wrote:
>
>
> > On Apr 25, 2023, at 9:25 AM, KenUnix via cctalk
> wrote:
> >
> > Rod,
> >
> > Never heard the singing. Switch room's were too noisy.
> On Apr 25, 2023, at 9:25 AM, KenUnix via cctalk wrote:
>
> Rod,
>
> Never heard the singing. Switch room's were too noisy.
>
> It always amazed me that those core planes were hand wired. I guess by
> little people. Or, big people with little hands.
People (often women I think) with
Ken,
Core places being hand wired amazed me as well. The maintenance panels on the
Honeywell mainframes were hand wired as well. They were works of art with lots
of toggle switches and lights (the later models switched to LEDs). I could see
most of the internal registers using a fancy
Rod,
Never heard the singing. Switch room's were too noisy.
It always amazed me that those core planes were hand wired. I guess by
little people. Or, big people with little hands.
On the PDP 8/I they were 4K plug in affairs.
Ken
On Tue, Apr 25, 2023, 9:14 AM Rod Bartlett via cctalk
wrote:
Ken,
This discussion does my geezer's heart good.
I used to maintain Honeywell mainframes in the late 1970s, some of which had
core memories. Tapping them on the floor wasn't an option since they were such
huge beasties but they did have space for spare bits. I've swapped to the
spare bits
David,
I could tell you I had an experience where I had a stuck bit in core memory.
It was in a trunk frame in a #2ESS AIS.
I removed the core package and tapped it on the floor, reinserted it and
the trouble cleared.
Sticky bit! Ha
I only knew that because it happened to me on my old
On Mon, Apr 24, 2023 at 11:11:35AM +0100, Pete Turnbull wrote:
> On 23/04/2023 22:52, KenUnix via cctalk wrote:
> > Pete,
> >
> > Did the 8E have core or solid state memory?
>
> It had both, but I didn't put the core boards in the dishwasher. I figured
> they might be too delicate for that, so
I would be tempted to take a board ot two outside and then use compressed
air to get off as much as possilble that way first, before cleaning with
anything.
Bill
On Sun, Apr 23, 2023, 12:54 PM Fritz Mueller via cctalk <
cctalk@classiccmp.org> wrote:
> Hi folks,
>
> I’ve been picking my way
Peter,
I could tell you I had an experience where I had a stuck bit in core memory.
It was in a trunk frame in a #2ESS AIS.
I removed the core package and tapped it on the floor reinserted it and the
trouble cleared.
Sticky bit! Ha
Ken
On Mon, Apr 24, 2023, 6:23 AM Pete Turnbull via cctalk <
On 23/04/2023 22:52, KenUnix via cctalk wrote:
Pete,
Did the 8E have core or solid state memory?
It had both, but I didn't put the core boards in the dishwasher. I
figured they might be too delicate for that, so I rinsed them by hand in
the kitchen sink.
I should have said that in my
/www.youtube.com/@w2hx/videos
>
>
> -Original Message-
> From: KenUnix via cctalk
> Sent: Sunday, April 23, 2023 5:53 PM
> To: General Discussion: On-Topic and Off-Topic Posts <
> cctalk@classiccmp.org>
> Cc: KenUnix
> Subject: [cctalk] Re: flipchip clean
--Original Message-
From: KenUnix via cctalk
Sent: Sunday, April 23, 2023 5:53 PM
To: General Discussion: On-Topic and Off-Topic Posts
Cc: KenUnix
Subject: [cctalk] Re: flipchip cleaning and pin corrosion inhibition
Pete,
Did the 8E have core or solid state memory?
Ken
On Sun, Apr 23, 2023
Pete,
Did the 8E have core or solid state memory?
Ken
On Sun, Apr 23, 2023 at 4:06 PM Pete Turnbull via cctalk <
cctalk@classiccmp.org> wrote:
> On 23/04/2023 17:54, Fritz Mueller via cctalk wrote:
>
> > I’ve been eying the dishwasher, for the subset of flip chips that that
> are just DIP
On 23/04/2023 17:54, Fritz Mueller via cctalk wrote:
I’ve been eying the dishwasher, for the subset of flip chips that that are just
DIP logic, carbon comp resistors, and ceramic bypass caps, anyway. But I
haven’t been brave enough to try that yet... Most of the logic here has date
codes
On 2023/04/23 10:00 a.m., Paul Koning via cctalk wrote:
On Apr 23, 2023, at 12:54 PM, Fritz Mueller via cctalk
wrote:
Hi folks,
I’ve been picking my way through a PDP-8/L restoration lately. I’ve found that
everything in the machine is covered with a uniform layer of dark “soot”
(enough
> On Apr 23, 2023, at 12:54 PM, Fritz Mueller via cctalk
> wrote:
>
> Hi folks,
>
> I’ve been picking my way through a PDP-8/L restoration lately. I’ve found
> that everything in the machine is covered with a uniform layer of dark “soot”
> (enough to blacken your hands while working with
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