On Sun, Dec 13, 2009 at 07:39:05AM +, Poul-Henning Kamp wrote:
In message 2157.12.6.201.67.1260689371.squir...@popaccts.quik.com, J.
Forste
r writes:
I'm not so sure about the Nova 1200. I think all the Novas had the RTC was
on a standard I/O board, [...]
No, it was an option, but
I don't know about 60Hz timebases for older UNIX systems, but I do
remember low end frequency counters being offered with mains derived
timebases - I remember them as a catalog item, I never saw one!
I think they were offered by Systron Donner and this was probably back in
the '60's. They even
In a message dated 13/12/2009 05:04:53 GMT Standard Time,
charles_steinm...@lavabit.com writes:
I think we all agree that intervals are what we measure. The
question is whether this has any bearing on whether time is an
absolute quantity, and if so, whether time being or not being an
Geoff Blake wrote:
I don't know about 60Hz timebases for older UNIX systems, but I do
remember low end frequency counters being offered with mains derived
timebases - I remember them as a catalog item, I never saw one!
I think they were offered by Systron Donner and this was probably back in
This discussion started off interestingly enough, but has deteriorated to a
point where it reminds me of a tale told to me by one of my mentors well
over 40 years ago. At the time, I was very interested in existential
philosophy myself and studied it and thought about it ad infinitum.
It goes
At 1:44 AM + 12/13/09, time-nuts-requ...@febo.com wrote:
Date: Sat, 12 Dec 2009 17:29:17 -0800
From: Colby Gutierrez-Kraybill co...@astro.berkeley.edu
Subject: [time-nuts] 60Hz mains clocking in computers
To: time-nuts@febo.com
Message-ID:
Hi the group,
Long time I didn't talk to the list, I got recently two EPSILON 2S gps 10Mhz
clocks, one with a readout and one older without.
These clocks dosn't boot up so I'm trying to repair them and to do this I'm
searching the two service manuals or at least the drawings.
Without it's
Joe Gwinn wrote:
At 1:44 AM + 12/13/09, time-nuts-requ...@febo.com wrote:
Date: Sat, 12 Dec 2009 17:29:17 -0800
From: Colby Gutierrez-Kraybill co...@astro.berkeley.edu
Subject: [time-nuts] 60Hz mains clocking in computers
To: time-nuts@febo.com
Message-ID:
In message 4b251964.5040...@rubidium.dyndns.org, Magnus Danielson writes:
Joe Gwinn wrote:
The exception to this was that video generators were (and still
are) often locked to the AC line so that hum bars would not drift across
the screen.
I have never seen this in any of the devices I've
Poul-Henning Kamp wrote:
In message 4b251964.5040...@rubidium.dyndns.org, Magnus Danielson writes:
Joe Gwinn wrote:
The exception to this was that video generators were (and still
are) often locked to the AC line so that hum bars would not drift across
the screen.
I have never seen this in
Industrial process control requires that event time stamps be close to
the correct social (wall clock) time, for correlation with events that
were not digitized. Computers at the heart of these control systems
were required to run on DC from batteries, and so the real-time clock
was derived from a
Nigel wrote:
I use absolute in the sense that is commonly implied in the term
absolute quantity, where an absolute quantity is the measure of
the absolute occurence of a variable, as in so many volts, yards, kilos, etc.
Volts and yards, at least, are also not absolute measurements in the
On 12/13/09 7:52 AM, Joe Gwinn joegw...@comcast.net wrote:
At 1:44 AM + 12/13/09, time-nuts-requ...@febo.com wrote:
Date: Sat, 12 Dec 2009 17:29:17 -0800
From: Colby Gutierrez-Kraybill co...@astro.berkeley.edu
Subject: [time-nuts] 60Hz mains clocking in computers
To:
Charles,
That's a very good description of the situation.
The real dilemma has to do with why some people require absolutes,
as perfect, complete, or pure, when nature doesn't offer any. The
need originates in the brain, where perceptions are adjusted to
find absolutes.
Absolute zero is merely
Dear Jim,
Another overlap in our past. Back when I was at UCLA I helped the
Ethnomusicology dept with their filming along with synced sound. This was in
1963-64. I designed and built a crystal sync system using the newly available
RTL logic ICs. I then modified a 16mm Arri to use it to
You guys obviously missed Hermann Weyl's writings, specifically his
Space-Time-Matter and Philosophy of Mathematics both of which I have
read exhaustively in my early 20's. That is well over 40 years ago, yet I
still feel the impact of some of his statements. That was mainly why earlier
I
Perhaps because we may move about in the three spatial
dimensions as we move unidirectionally in the temporal dimension?
Charles P. Steinmetz wrote:
The puzzle is why we perceive the spatial dimensions so differently from
the temporal dimension. It is a fascinating question, but may
At 4:53 PM + 12/13/09, time-nuts-requ...@febo.com wrote:
Date: Sun, 13 Dec 2009 17:42:12 +0100
From: Magnus Danielson mag...@rubidium.dyndns.org
Subject: Re: [time-nuts] 60Hz mains clocking in computers
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
At 01:51 PM 12/13/2009, Charles P. Steinmetz wrote...
In my view, these are all questions, not about time, but rather about
our perception of time.
Yes, he seems to have discovered Eddington's arrow of time.
There also seems to be some confusion over the difference between the
spacetime
Spotted this on another mailing list -- thought someone might be
interested in the Atomichron...
Replies to the OP, please -- his name is Dave McGuire, email mcguire AT
neurotica DOT com.
begin snip
Subject: rare stuff available
That's really rare, not eBay rare. My employer was
Here's a link to some history.
http://www.ieee-uffc.org/main/history.asp?file=atomichron
73, Dick, W1KSZ
-Original Message-
From: Philip Pemberton li...@philpem.me.uk
Sent: Dec 13, 2009 4:27 PM
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Subject:
By the way I see the original thread is that someone has one.
This thing is huge. A rack plus.
Can't imagine the weight. Crazier still you have to wonder if it might work.
Even though the vacuum is most likely a huge issue.
Still belongs some place.
On Sun, Dec 13, 2009 at 5:11 PM, paul swed
Philip Pemberton wrote:
First, I have a set of original DEC OS/8 TU56 distribution tapes. I
emphasize, these are *original*, nearly pristine, DEC-labeled
distribution tapes. I've had these for nearly thirty years. 'Nuff said.
SNIP
Second, I have an Atomichron. Yes, a real one, a
Well the reader is also an issue though I have had some reel to reel audio
tapes that were 30 years old and they had held up very well. Encoded them to
disk a couple of years back.
Interesting reading on the atomicron. But thats one big rack plus tube.
Certainly a piece of history or a very good
Likely true. There is a DEC museum in WA state, I think. A Paul Allen
thing maybe? They might be interested. Reading 30+ YO mag tape might be
pretty hard.
The Atomichron might find a home at the Smithsonian.
The poor guy's situation makes you think about what your treasures are
really worth.
paul swed wrote:
Well the reader is also an issue though I have had some reel to reel audio
tapes that were 30 years old and they had held up very well. Encoded them to
disk a couple of years back.
Interesting reading on the atomicron. But thats one big rack plus tube.
Certainly a piece of
At 05:41 PM 12/13/2009, J. Forster wrote:
Likely true. There is a DEC museum in WA state, I think. A Paul Allen
thing maybe? They might be interested. Reading 30+ YO mag tape might be
pretty hard.
Isn't a punched paper or mylar tape? The DEC 8e machines I've seen
(controlling NC punches)
Interesting reading on the atomicron. But thats one big rack plus tube.
Certainly a piece of history or a very good anchor for a battleship.
The Atomicron is certainly a huge piece and sure it is rare. There is
few people that I would think of that would consider it. In the best of
Hi:
There are some patents by National for frequency standards:
2883540 Microwave Signal Generating System
http://www.google.com/patents/about?id=5lhwEBAJdq=2883540
2972115 Molecular Beam Apparatus ***
http://www.google.com/patents/about?id=eUhKEBAJdq=2972115
2960663 Frequency Control
John Miles wrote:
I think a lot of the later development work on cesium-beam standards was
aimed at reducing their physical size, cost, and maintenance requirements.
Unlike miniaturized, mass-produced, hermetically sealed tubes, the
Atomichron's tube was probably built in a way that permits
Subject: Re: [time-nuts] LORAN C simulator operational
Paul:
Stanley and everyone here are the LORAN C simulator documents.
Please let me know were you post them to.
www.n4iqt.com/simloran
Working on a web page but the files avabile now.
Stanley
Mike wrote:
You guys obviously missed Hermann Weyl's writings, specifically his
Space-Time-Matter and Philosophy of
Mathematics * * * That was mainly why earlier I expressed
my opinion simply as bullshit
Not at all. It's just that for all of Weyl's brilliant contributions
to
Well, one thing for sure, my mind was a lot more impressionable in my early
20's than it is now at 65 :). Regardless, I found Weyl's writings to
coincide a lot more with my way of thinking than any of the other
philosophers whom I read at the time. Coincidentally, your middle name would
not be
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