Chuck, the CDC 7600 duty cycle integrator is really a work-around against
overheating and has nothing to do with core reliability and/or endurance.
Core and the data stored in it lives "forever" if the operating constraints
of the medium are adhered to (temperature being one of the constraints).
On Thu, Feb 2, 2023 at 5:54 AM emanuel stiebler via cctalk <
cctalk@classiccmp.org> wrote:
> On 2023-02-02 04:38, David Brownlee wrote:
>
> > So, what else do you guys use, to make sure your data is safe for the
> > years to come?
>
I wanted to note a story about AWS: I used to be heavy into
On 2/2/23 21:23, Tom Hunter via cctalk wrote:
> The actual ferrite core doughnuts do not break down with continued use, BUT
> moisture or mechanical impact or vibration will damage or degrade the
> ferrite cores. Otherwise the ferrite doughnut will live and maintain its
> properties "forever".
On 2/2/23 4:28 PM, Jim Brain wrote:
Hmm, I'd be happy to do a Zoom call to show folks. Git can be
complicated, but the simpler items are easy and using the command line
git connected to a github/bitbucket/gitlab repo and a simple git push
and all your local data/files under control are
The actual ferrite core doughnuts do not break down with continued use, BUT
moisture or mechanical impact or vibration will damage or degrade the
ferrite cores. Otherwise the ferrite doughnut will live and maintain its
properties "forever".
The main cause of core memory mat faults is mechanical
On Thu, Feb 2, 2023 at 3:45 PM Van Snyder via cctalk
wrote:
> On Thu, 2023-02-02 at 18:28 -0500, William Sudbrink via cctalk wrote:
> > After more than three years, U of Iowa's PDP-8 project active again
>
> Years ago, I had a colleague named Prentiss Knowlton who built a
> solenoid bank to
On Thu, Feb 2, 2023 at 3:53 PM Bill Gunshannon via cctalk <
cctalk@classiccmp.org> wrote:
>
> On 2/2/2023 6:39 PM, Sellam Abraham via cctalk wrote:
> > Hi Jim.
> >
> > I'd be down for that. It would also be an opportunity to socialize a
> > little bit. I don't believe we've ever had an
> For ordinary CD's I've always used MAM-A Gold. Started buying when it
> was a Mitsui brand and haven't had a single failure.
Chuck,
Which brand is MAM-A?
-Ali
Nice! Years back I gave Dr. Jones my PDP-8/L, prior to moving out of Iowa. I
wonder if he still has it, and put it to use.
-mike
-Original Message-
From: William Sudbrink via cctalk
Sent: Thursday, February 2, 2023 3:29 PM
To: 'General Discussion: On-Topic and Off-Topic Posts'
Cc:
On 2/2/2023 6:39 PM, Sellam Abraham via cctalk wrote:
On Thu, Feb 2, 2023 at 3:28 PM Jim Brain via cctalk
wrote:
I've tried a few times to make sense of how GitHub works but I gave up.
It's a mess.
Sellam
Hmm, I'd be happy to do a Zoom call to show folks. Git can be
complicated, but the
On Thu, 2023-02-02 at 18:28 -0500, William Sudbrink via cctalk wrote:
> After more than three years, U of Iowa's PDP-8 project active again
Years ago, I had a colleague named Prentiss Knowlton who built a
solenoid bank to connect to his PDP-8. He put the solenoid bank on the
keyboard of the
On Thu, Feb 2, 2023 at 3:28 PM Jim Brain via cctalk
wrote:
> > I've tried a few times to make sense of how GitHub works but I gave up.
> > It's a mess.
> >
> > Sellam
>
> Hmm, I'd be happy to do a Zoom call to show folks. Git can be
> complicated, but the simpler items are easy and using the
I keep forgetting to mention that I got a straight 8 too. Plan to start
working on it in the spring.
Bill
On Thu, Feb 2, 2023, 6:30 PM William Sudbrink via cctalk <
cctalk@classiccmp.org> wrote:
> Forgot the link:
>
> https://homepage.divms.uiowa.edu/~jones/pdp8/UI-8/log.shtml
>
>
>
Forgot the link:
https://homepage.divms.uiowa.edu/~jones/pdp8/UI-8/log.shtml
-Original Message-
From: William Sudbrink via cctalk [mailto:cctalk@classiccmp.org]
Sent: Thursday, February 02, 2023 6:28 PM
To: 'General Discussion: On-Topic and Off-Topic Posts'
Cc: William Sudbrink
After more than three years, U of Iowa's PDP-8 project active again
--
This email has been checked for viruses by Avast antivirus software.
www.avast.com
On 2/2/2023 1:47 PM, Sellam Abraham via cctalk wrote:
On Thu, Feb 2, 2023 at 11:26 AM Vincent Slyngstad via cctalk <
cctalk@classiccmp.org> wrote:
I've also seen a work style where everything is pushed to github when
"finished", but github storage limits are small and the interface is
awkward
I love the small note about Steve Wozniak in the second magazine... lots
of hardware experience - Time poor :-)
Kindest regards,
Doug Jackson
em: d...@doughq.com
ph: 0414 986878
Check out my awesome clocks at www.dougswordclocks.com
Follow my amateur radio adventures at vk1zdj.net
On Fri,
On Thu, Feb 2, 2023 at 1:34 PM Tarek Hoteit via cctalk <
cctalk@classiccmp.org> wrote:
> One website has an archive of the first Homebrew Computer Club
> newsletters. The newsletter is associated with the Homebrew club that
> kicked off the personal computer revolution
>
>
One website has an archive of the first Homebrew Computer Club newsletters. The
newsletter is associated with the Homebrew club that kicked off the personal
computer revolution
https://arkive.net/gallery/homebrew-computer-club
Regards,
Tarek Hoteit
On Thu, Feb 2, 2023 at 11:26 AM Vincent Slyngstad via cctalk <
cctalk@classiccmp.org> wrote:
> I've also seen a work style where everything is pushed to github when
> "finished", but github storage limits are small and the interface is
> awkward to me.
>
I've tried a few times to make sense of
On 2023-02-02 8:27 a.m., Jon Elson via cctalk wrote:
I do many backups on blu-ray DVD's, the theory is if they start to go
bad, maybe partial recovery of important files will be possible due to
having many copies on DVD.
This is getting a bit difficult as the amount of stuff to be backed up
On 2023-02-02 8:25 a.m., Paul Koning via cctalk wrote:
As Will pointed out, cores are fairly large storage elements, and their
switching speeds are more modest. Not necessarily quite so modest, though --
the CDC 6600 mainframes in 1964 had memory cycling at 1 MHz rate, which means
the basic
On 2/2/2023 3:54 AM, emanuel stiebler via cctalk wrote:
So, what else do you guys use, to make sure your data is safe for the
years to come?
I maintain a large SVN repository, which also serves as the backing
store for my website. I rely on the backup policies at DreamHost, but I
also keep
I have a Synology 4-bay san that has 4 2-tb drives in a raid stripe. I backup
to that. I do convert software cd’s and dvd to .iso and floppies to .img and
copy the results to the san.
Sent from my iPhone
> On Feb 2, 2023, at 07:27, Jon Elson via cctalk wrote:
>
> On 2/2/23 05:54, emanuel
> On Feb 2, 2023, at 11:03 AM, Sellam Abraham via cctalk
> wrote:
>
> This discussion on core memory got me thinking:
>
> Is it possible to "read" core memory by examining each core using some kind
> of instrument that would sense its "charge" (or lack thereof)
> non-destructively?
>
>
> On 02/02/2023 10:03 AM CST Sellam Abraham via cctalk
> wrote:
>
>
> This discussion on core memory got me thinking:
>
> Is it possible to "read" core memory by examining each core using some kind
> of instrument that would sense its "charge" (or lack thereof)
> non-destructively?
>
>
This discussion on core memory got me thinking:
Is it possible to "read" core memory by examining each core using some kind
of instrument that would sense its "charge" (or lack thereof)
non-destructively?
Could a piece of paper be placed over a core plane and fine particles of
iron sprinkled
On 2/2/23 05:54, emanuel stiebler via cctalk wrote:
On 2023-02-02 04:38, David Brownlee wrote:
> That reminds me (looks at 43.5T of zfs pool that has not
had a scrub
> since 2021).
>
> It can be nice to have a filesystem which handles
redundancy and also
> the option to occasionally read all
> On Feb 2, 2023, at 10:17 AM, Jon Elson via cctalk
> wrote:
>
> On 2/1/23 22:10, Will Cooke via cctalk wrote:
>>
>>> On 02/01/2023 3:51 PM CST Paul Koning via cctalk
>>> wrote:
>>>
>> ot sure about that. What sort of numbers are we talking about?
>>> If all else fails there's core
On 2/1/23 22:10, Will Cooke via cctalk wrote:
On 02/01/2023 3:51 PM CST Paul Koning via cctalk wrote:
ot sure about that. What sort of numbers are we talking about?
If all else fails there's core memory, which as far as I remember is pretty
much unlimited for both read and write.
paul
I
> So, what else do you guys use, to make sure your data is safe for the
> years to come?
ZFS and redundant copies of important stuff, plus backups on media that's
likely to be readable in 10 years (meaning the drives must still work/be
available, too!)
Anything that's appropriate to have on a
On 2023-02-02 04:38, David Brownlee wrote:
> That reminds me (looks at 43.5T of zfs pool that has not had a scrub
> since 2021).
>
> It can be nice to have a filesystem which handles redundancy and also
> the option to occasionally read all the data, check end to end
> checksums (in the unlikely
On Wed, 1 Feb 2023, skogkatt...@yahoo.com wrote:
You stop being rude you big burly baby. Get a life. I'm not your hobby, as hard
as you're trying to make me so.
*PLONK*
I would be interested in it - Happy to pay postage to Australia, and a bit
for the machine ;-)
Kindest regards,
Doug Jackson
em: d...@doughq.com
ph: 0414 986878
On Thu, 2 Feb 2023 at 20:42, David Brownlee via cctalk <
cctalk@classiccmp.org> wrote:
> I had some idea of trying to get money
I had some idea of trying to get money for an HP 41-CX a while back,
but on balance I think it's best to just go to someone who might be
interested in fixing it up and valuing it for what it is.
So - FTGH, just the cost of shipping (photo link below still valid)
David
On Sun, 19 Apr 2020 at
On Wed, 1 Feb 2023 at 17:13, emanuel stiebler via cctalk
wrote:
>
> On 2023-02-01 10:56, Warner Losh wrote:
> >
> > On Wed, Feb 1, 2023 at 1:41 AM emanuel stiebler via cctalk
> > mailto:cctalk@classiccmp.org>> wrote:
>
> > retension in case of power off.
> > If the power is applied all
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