>  Repair?    A decent oscilloscope the size of a multimeter now costs about $US 300.

Yes actually I use a USB oscilloscope which is called the Digilent Analog Discovery 2. It's pretty good although I tend to avoid setting it up for quick jobs. I am considering getting a standalone model. I bought the Analog Discovery from a student I used to teach, she showed me hers and I was quite impressed so I asked her to buy me one from a former student of her course which she did. I was not impressed with the course using clip leads instead of probes, so I ordered some good ones as a gift for her and another set for myself. Sad to say she gave me her AD2 and probes when she left the country to take up a job in Shanghai with Huawei, I tried to convince her to keep them but she said she would probably be doing a lot of overtime as a junior engineer at Huawei and would not have time for home projects. Sensible! So anyway now I have two of these setups.



As to the repair, I think I can do it. I got interested in historic computers and i have done some repairs on them which turned out surprisingly easy when schematics are available. For instance on an Apple IIc green monitor i discovered a fault in a vertical sync circuit and replaced a 350V 1uF capacitor to fix the problem (without killing myself too). Lately i had problems with an Apple IIc disk drive and I am planning to replace the write amplifier chip on the analog board, the chip arrived a while ago although i want to do some probing before committing to replacing it. (I also bought a second machine which i can use to compare signals).



Trouble is i dont really have time atm so i am usually looking for a quick solution. For instance when family laptop failed the quickest way was not to fix it for now, but to order a new battery for another laptop that i rescued from a tech recycling dumpster.



Cheers, Nick








>
> On 28 Sept 2024 at 11:09 pm, dng-request <dng-request@???> wrote:
>
>
> Send Dng mailing list submissions to
> dng@???
>
> To subscribe or unsubscribe via the World Wide Web, visit
> https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
> or, via email, send a message with subject or body 'help' to
> dng-request@???
>
> You can reach the person managing the list at
> dng-owner@???
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Dng digest..."
>
>
> Today's Topics:
>
> 1. Re: Ah, so "Do one thing and do it well" is sooo greybeard,
> right? (Didier Kryn)
> 2. Re: unresponsive machine (nick)
> 3. Re (2): unresponsive machine (peter@???)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 28 Sep 2024 14:30:42 +0200
> From: Didier Kryn <kryn@???>
> To: dng@???
> Subject: Re: [DNG] Ah, so "Do one thing and do it well" is sooo
> greybeard, right?
> Message-ID: <0d217ff6-dd1a-40cd-a30c-37cc4449f34d@???>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> Le 28/09/2024 ? 12:52, al3xu5 via Dng a ?crit?:
> > Fri, 27 Sep 2024 16:32:25 -0400 - Steve Litt<slitt@???>:
> >
> >> Hi all,
> >>
> >> We've all heard it: If you don't accept the gratuitous and promiscuous
> >> integration of systemd, you're a greybeard. POSIX is sooo 1970.
> >>
> >> Now Microservices is the modern thing. Read this simple description of
> >> microservices:
> >>
> >> https://enterprisersproject.com/article/2017/8/how-explain-microservices-plain-english
>
> ??? It also promotes "web service as an application", which is in
> favour of Google's and Amazon's buzyness model.
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <https://mailinglists.dyne.org/cgi-bin/mailman/private/dng/attachments/20240928/ed0de11f/attachment.htm>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 28 Sep 2024 22:40:58 +1000
> From: nick <nick@???>
> To: dng <dng@???>
> Subject: Re: [DNG] unresponsive machine
> Message-ID: <324b7927-0e78-44d9-b078-a2a70cc33cfb@edison>
> Content-Type: text/plain; charset="utf-8"
>
>
>
> Well there could be many causes why you do not have the uptime you should have.
>
>
>
> What about hardware? I have a desktop that crashes from time to time. It used to be reliable but I had been coming to the conclusion that CPU, mobo or one of the memory sticks had gone bad. This idea was supported by the fact the machine sometimes fails POST. But lately I was in the BIOS setup and I saw a warning that the 3.3V is low (only 2.9V). So when i have time for troubleshooting ill check it with a multimeter and see about repairing or replacing the PS. Not anxious to do that as its a pricey 1000W corsair that i bought for a tidy sum on ebay but needs must. Anyway, I recommend you run on a different but similar HW platform and see if your issue goes away.
>
>
>
> Another thing that would concern me if running lots of heavy apps is memory overcommit. Not wanting to start any flame wars but i distrust present memory management strategies and the OOM killer fills me with dread, even though i only encounter it very rarely and usually because I did something silly like coding an unintentional fork bomb or whatnot. And maybe if you ensure your system has adequate swap it might help the issue?
>
>
>
> Just throwing a few things out there. I am sure you can resolve the issue eventually!!
>
>
>
> Kind regards,
>
> Nick
>
>
>
>
>
>
>
>
> >
> > On 28 Sept 2024 at 10:00?pm, dng-request <dng-request@???> wrote:
> >
> >
> > Send Dng mailing list submissions to
> > dng@???
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
> > or, via email, send a message with subject or body 'help' to
> > dng-request@???
> >
> > You can reach the person managing the list at
> > dng-owner@???
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Dng digest..."
> >
> >
> > Today's Topics:
> >
> > 1. Re: Ah, so "Do one thing and do it well" is sooo greybeard,
> > right? (al3xu5)
> > 2. file names (was: Re: Learning C) (karl@???)
> > 3. Re: coredump et al (o1bigtenor)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sat, 28 Sep 2024 12:52:13 +0200
> > From: al3xu5 <dotcommon@???>
> > To: dng@???
> > Subject: Re: [DNG] Ah, so "Do one thing and do it well" is sooo
> > greybeard, right?
> > Message-ID: <mailman.2.1727524801.21108.dng@???>
> > Content-Type: text/plain; charset="us-ascii"
> >
> > Fri, 27 Sep 2024 16:32:25 -0400 - Steve Litt <slitt@???>:
> >
> > > Hi all,
> > >
> > > We've all heard it: If you don't accept the gratuitous and promiscuous
> > > integration of systemd, you're a greybeard. POSIX is sooo 1970.
> > >
> > > Now Microservices is the modern thing. Read this simple description of
> > > microservices:
> > >
> > > https://enterprisersproject.com/article/2017/8/how-explain-microservices-plain-english
> >
> > I am amazed.
> > This article is in a "Supported by RedHat" project. And an approach is
> > praised that is *totally* on the opposite of that of systemd.
> > The world is truly a strange place..
> >
> > Regards
> > alexus
> >
> >
> > --
> > The only way humans have learned to survive brings them to extinction.
> > ______________________________________________________________________
> > Public GPG/PGP key: 8FC2 3121 2803 86E9 F7D8 B624 DA50 835B 2624 A36B
> > -------------- next part --------------
> > A non-text attachment was scrubbed...
> > Name: not available
> > Type: application/pgp-signature
> > Size: 833 bytes
> > Desc: Firma digitale OpenPGP
> > URL: <https://mailinglists.dyne.org/cgi-bin/mailman/private/dng/attachments/20240928/19261ce0/attachment.sig>
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Sat, 28 Sep 2024 13:37:59 +0200 (CEST)
> > From: karl@???
> > To: dng@???
> > Subject: [DNG] file names (was: Re: Learning C)
> > Message-ID: <20240928113800.0DFA285C3A70@???>
> > Content-Type: text/plain
> >
> > SteveT:
> > ...
> > > The one thing I think MSDOS and CPM (and I think RT-11 too) got right
> > > is to use an extension for binary executables.
> > ...
> >
> > Then you might like VMS which had version numbers like FILE.TXT;3
> > https://docs.vmssoftware.com/guide-to-openvms-file-applications/#FILE_SPECS
> > Seem to still be very much alive:
> > https://vmssoftware.com/about/v921/
> >
> > Regards,
> > /Karl Hammar
> >
> >
> >
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Sat, 28 Sep 2024 06:47:15 -0500
> > From: o1bigtenor <o1bigtenor@???>
> > Cc: Devuan ML <dng@???>
> > Subject: Re: [DNG] coredump et al
> > Message-ID:
> > <CAPpdf5-OWM3Wbt_=gwCR0xFZR4OX0S7_T-oXevUKC51YNtCv3w@???>
> > Content-Type: text/plain; charset="utf-8"
> >
> > On Sat, Sep 28, 2024 at 3:13?AM Martin Steigerwald <martin@???>
> > wrote:
> >
> > > Hi.
> > >
> > > o1bigtenor via Dng - 27.09.24, 15:23:28 CEST:
> > > > I complained to KDE that their program kwin, used by a lots of desktop
> > > > display editors (at least as I understand it), lists as supporting only
> > > > some 20 virtual desktops. (And I, or course, want more!!)
> > > >
> > > > So they are asking me to use coredumpctl after the next episode to give
> > > > them information as to what the problem might be. Now coredumptctl only
> > > > works on a systemd machine. I looked and found this
> > > > http://debian-packages.coredump.us/ it seems to be quite some outdated
> > > > (my guess is at least some 5 years old - - - likely more).
> > >
> > > Why did they ask for core dump? Did you experience a crash with more
> > > desktops?
> > >
> >
> > Dunno why they asked - - - just know that they did.
> >
> > Yes - - - my system goes unresponsive at somewhat regular intervals.
> > In fact - - I'm running the devuan 6.1.18 kernel instead of any newer
> > version because it gives me the longest up time.
> >
> > My guess is that using lots of desktops with their own browser windows
> > fuels the issue. I had been running with having 4 separate browsers up
> > and found that having only 2 increased the uptime. I really dunno much
> > and there is noting in the log files that tells me anything as to causes.
> >
> > >
> > > I prefer using activities over desktops. Of course it is possible to
> > > combine those, but with my laptop display next to bigger external display
> > > setup I do not need that.
> > >
> > >
> > Hmmm - - - If you have never experienced it I would suggest you find a
> > way to try a system with at least 3 if not more monitors. In fact with 4k
> > monitors, if you don't need 120Hz refresh, they are quite reasonable now.
> > You might find yourself ditching the laptop for when you're working
> > (grin!).
> >
> > There is no way that I would want to go back to a single monitor for a
> > serious
> > work machine. Now for a reading/email kind of system - - - fine but I find
> > that even when I'm doing my bookkeeping - - - I have a terminal open for
> > the program, there is a text file that is where the data is entered, I have
> > my
> > copy of my account codes (a page in a document) and a calculator. Another
> > screen has a browser page for when I need to check something on official
> > pages. So that's for something simple - - - any time I'm doing some CAD
> > stuff that 4k screen is very very useful.
> > (I have already calculated that I wouldn't want a present 8k screen as it
> > would cause too much head tilt to see from the bottom to the top of the
> > screen so - - - if I were replacing monitors I would be moving to 3 - 4ks
> > at around the mid 40" size. Haven't been convinced that having a very
> > small pixel pitch is an asset.)
> >
> > So - - - is there anyone with some knowledge as to what to use on Devuan
> > for coredumps - - - please?
> >
> > TIA
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL: <https://mailinglists.dyne.org/cgi-bin/mailman/private/dng/attachments/20240928/ce2eb0c2/attachment.htm>
> >
> > ------------------------------
> >
> > Subject: Digest Footer
> >
> > _______________________________________________
> > Dng mailing list
> > Dng@???
> > https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
> >
> >
> > ------------------------------
> >
> > End of Dng Digest, Vol 120, Issue 51
> > ************************************
> >
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <https://mailinglists.dyne.org/cgi-bin/mailman/private/dng/attachments/20240928/7019ae90/attachment.htm>
>
> ------------------------------
>
> Message: 3
> Date: 28 Sep 2024 06:09:09 -0700
> From: peter@???
> To: dng@???
> Subject: [DNG] Re (2): unresponsive machine
> Message-ID: <mailman.4656.1727528953.6705.dng@???>
>
> From: nick <nick@???>
> Date: Sat, 28 Sep 2024 22:40:58 +1000
> > ... saw a warning that the 3.3V is low (only 2.9V).
>
> Repair? A decent oscilloscope the size of a multimeter now costs
> about $US 300.
>
> Regards, ... P.
>
>
> --
> VoIP: +1 604 670 0140
> work: https://en.wikibooks.org/wiki/User:PeterEasthope
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> Dng mailing list
> Dng@???
> https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
>
>
> ------------------------------
>
> End of Dng Digest, Vol 120, Issue 53
> ************************************
>