On 06/25/21 17:28, Jim Pennino wrote:
William Unruh wrote:
On 2021-06-25, Jim Pennino wrote:
chris wrote:
On 06/25/21 04:08, Jim Pennino wrote:
William Unruh wrote:
I suspect it is the number of times that ntpd tries to contact the
server and fails rather than the time that is
On 06/25/21 04:08, Jim Pennino wrote:
William Unruh wrote:
I suspect it is the number of times that ntpd tries to contact the
server and fails rather than the time that is important. You could try
putting the server offline and then online again (I use chrony so do not
remember if ntpd has t
On 06/10/21 03:17, William Unruh wrote:
On 2021-06-09, chris wrote:
On 06/09/21 22:00, ProGeek wrote:
On Wednesday, June 9, 2021 at 6:56:04 PM UTC+3, chris wrote:
On 06/08/21 20:42, Andreas Mattheiss wrote:
Hello,
just as additional source of information: I have a similar setup here
(ublox
On 06/09/21 22:00, ProGeek wrote:
On Wednesday, June 9, 2021 at 6:56:04 PM UTC+3, chris wrote:
On 06/08/21 20:42, Andreas Mattheiss wrote:
Hello,
just as additional source of information: I have a similar setup here
(ublox PPS into a proper serial port of a PC) and I see a stable offset of
-3
dreas
This is what I see at the ntp host here:
chris@ntp-host:~ % ntpq -pn
remote refid st t when poll reach delay offset jitter
==
o127.127.22.0 .PPS.0 l18 3770.0000.000 0.001
+192.9.20
On 01/14/21 12:15, Gerd Hoerst wrote:
Hi !
I jioned the pool days ago with 2 Servers (1 with IPv4 and 1 with IPv6) its
from the source (and hardware) the same server (it get the time from 4 serverws
with 2x GPS+PPS and 2xDCF77 Receivers)
But when i watch the score IPv6 side show delay around 4
on,
or is it staying resident in memory ?...
Regards,
Chris
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econds
| initalloc count | initmem kilobytes | incalloc count |
incmem kilobytes]
mru mindepth 5 maxdepth 100 initmem 1 incmem 1 maxage 86400
> Le 13 août 2019 à 00:34, Chris Trevino a écrit :
>
>
> I’m running NTP servers on centos 7.6. I know
Error: inapropriate ioctl for device
or:
link lpt0 pps0 # Error: Device busy
Thanks,
Chris
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I’m running NTP servers on centos 7.6. I know that I can get a list of ntp
clients doing “ntpq -p” but I seem to remember reading somewhere that it was
limited to 500 clients.
Is there another method in which I can quickly get / monitor the number of
clients that are “attached” to my server if
On 08/02/19 18:47, Chris wrote:
Will leave it running overnight and check again in the
morning...
Just an update. Checked again this morning and the
.169 node with disconnected antenna has finally been
dropped by ntp and replaced by the external pool entry.
root@ntp-host:/etc # ntpq -p
On 08/02/19 12:49, Andrew Harrison wrote:
On Wednesday, July 31, 2019 at 7:23:52 PM UTC-4, Chris wrote:
If you have 2 servers, both gps, then the polling host needs to
have config to allow fallback to the second unit when it fails.
Yes, definitely. The problem is that it doesn't "
On 08/01/19 12:43, Terje Mathisen wrote:
Chris wrote:
On 07/31/19 20:10, Andrew Harrison wrote:
The backstory... I've been tasked with deploying a pair of
Symmetricom TP1100 Time Providers with GPS antennae as the official
time source for the company (replacing an ancient server w
ss each has fallback ability in
itself.
What you could do is run ntpd on a third host, polling both time
servers along with a host or two from an ntp pool, which should have
the ability to spot the outlier and continue providing accurate time.
Not sure about the overall behavior, but woul
if s/hand.
USB never was designed for real time work and trying to use it for
such is always going to be hard work and a compromise...
Chris
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e a better plan would be to find a gps module or receiver
with a serial interface and interface to that. New GPS modules are cheap
as chips on Ebay and elsewhere and so are s/h gps boxes, so why make
life difficult ?...
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On 07/21/19 15:02, Terje Mathisen wrote:
William Unruh wrote:
On 2019-07-19, Chris wrote:
On 07/18/19 11:13, William Unruh wrote:
Sure, but I do not have faith in the "averaging" If one is always 30us
after the other, then the average will always be out by 15us.
One woul
On 07/19/19 21:47, William Unruh wrote:
No. The mechanism is clear. While one is answering its interrupt the
other gets to wait. So, it is the earliest one that is closest to
"right" Ie, do not try to use more than one interrupt on the same
computer. It does not work
I think we are at cross p
On 07/18/19 11:13, William Unruh wrote:
Sure, but I do not have faith in the "averaging" If one is always 30us
after the other, then the average will always be out by 15us.
One would expect a difference, but how can you tell which one is right
using just 2 pps ?. With three, you could choose
On 07/13/19 16:38, Chris wrote:
On 06/20/19 23:39, Chris wrote:
Have a couple of surplus gps based ntp servers that have been
used for time sync in the lab for few years. They are on a UPS
with several hours backup and seems like a good idea to use
them to contribute to the ntp global network
Don't know enough to say, but
perhaps ntp will average out the two to give a more accurate
result ?. Would be interesting to hook it up and see what
happens anyway...
Chris
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On 06/20/19 23:39, Chris wrote:
Have a couple of surplus gps based ntp servers that have been
used for time sync in the lab for few years. They are on a UPS
with several hours backup and seems like a good idea to use
them to contribute to the ntp global network.
Don't want to expose
On 06/25/19 19:35, William Unruh wrote:
On 2019-06-25, Chris wrote:
...
Thanks again for the replies. Did a bit of digging this morning and
find that the 1pps sync stuff has been done before. Well, many
years ago in fact and more or less how I had visualised it - ntp
data augmented by the 1
r
router to provide the isolation, as it would only be handling ntp
packets at low and consistent system and network load.
Nothing is ever as easy as it seems, as usual...
Chris
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On 06/25/19 10:52, David Taylor wrote:
On 25/06/2019 01:33, Chris wrote:
[]
Thanks for all the replies. I guess the next thing to do is to build
a working system, then evaluate to see how it can be improved. All
the kit is in the same rack and with dedicated hardware interfaces,
network latency
On 06/25/19 11:34, William Unruh wrote:
On 2019-06-25, Chris wrote:
On 06/21/19 15:48, Jakob Bohm wrote:
On 21/06/2019 15:14, Thomas Laus wrote:
On 2019-06-21, David Woolley wrote:
On 21/06/2019 12:26, Thomas Laus wrote:
Will either isolation solution have direct access to the computer
. 1 u 21 64 377 0.46 -0.0710.08
Thanks,
Chris
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ach refclock driver.
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Lars Schotte [l...@gustik.eu] wrote:
> Well, I know that OpenBSD currently has no support for DVB-T but Linux
> does, so I would run that RaspberryPi with Linux. However, the question
> would be how to pair its output with OpenNTPd or NTPd.
>
OpenBSD actually does support some of the ugen userlan
small kernel driver.
Maybe you can hack the dvbdate utility into a source of NMEA 0183 data
to be opened as a socket from ntpd.
Chris
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s
> those
> digit strings:
> #$ 3629404800
> #@ 3660249600
I am not going to argue about whether those lines should or should not exist in
the leap seconds file.
All I can say is that everything worked perfectly for me without them.
-chris
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Jul 01 2015 00:00:01.399
Jul 01 2015 00:00:01.899
Jul 01 2015 00:00:02.399
Jul 01 2015 00:00:02.899
-chris
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Jim,
Are you giving ntpd long enough to stabilize?
The INS flag won't typically get set until several minutes after ntpd reports
synchronization.
Try setting your clock to 23:45UTC at the beginning of your test.
-chris
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ecessary for some
things) as seconds since an epoch, and that's pretty widely used. By
that I mean that the number of seconds between 2015-06-30 23:59:00 and
2015-07-01 00:00:00 has changed since last month.
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ot
quite as accurate).
>Probably a suitable kernel will be in CentOS 7.x
Looking at the RHEL 7 beta, it does include the pps_parport module.
However, I expect it will be another few months before RHEL 7.0 is
released, and then a month or two after that for Cent
"David Taylor" wrote in message news:l856os$9sp$1...@dont-email.me...
Chris,
I very much share your own confidence level in Linux. I find myself
even having to look up basic commands like how to move a file, delete a
non-empty directory etc. However, the folks here and elsewhere
"David Taylor" wrote in message news:l84ss1$5ct$1...@dont-email.me...
On 09/12/2013 11:30, Chris North wrote:
David,
I have managed to fix it, and it was a bit unexpected. When I first
installed the Sure, I used a USB connection and got it working OK. I then
used a Serial-USB a
"David Taylor" wrote in message news:l82ft0$71s$1...@dont-email.me...
OK, Chris, so it's not a hardware issue. I don't know the message:
"Exec format error"
on Windows, but it sounds like the support DLL or driver isn't right.
When you list the COM1 de
"David Taylor" wrote in message news:l828dq$abc$1...@dont-email.me...
On 08/12/2013 16:36, Chris North wrote:
Most of the discussion here is way above my head, but I'm hoping
somebody will be able to help me.
I have a Sure GPS board, modified according to David Taylor's
Most of the discussion here is way above my head, but I'm hoping somebody
will be able to help me.
I have a Sure GPS board, modified according to David Taylor's plan,
connected to a Windows 7 PC by USB (for power only) and by serial null-modem
cable to COM1 on a PCI serial card.
I am running
40 2 u 88 128 377 23.243 -2.734 1.810
127.127.8.0 .GPS.0 l 392 1600.0001.016 0.000
x127.127.22.0.GPS.0 l2 16 3770.000 -4.524 0.684
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leap second come from?
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)?
Remember: a man with two clocks never knows what time it is.
If they are the same, everything's great; if they are different, what do
you do?
--
Chris Adams
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but mysel
my old Trimble SVeeSix has to have a stretch on the PPS for it to
work.
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I don't speak for anybody but myself - that's enough trouble.
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que
;01",
SYMLINK+="gps gps0 refclock-0", MODE:="660", GROUP:="ntp"
I then have my PPS connected to a parallel port (obviously not available
on the Pi, but GPIO is there and Linux has pps-gpio). I haven't tried
connecting my GPS to my Pi yet.
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ccuracy is wasted on NTP, microseconds are good enough
fro driving NTP. But perhaps you have other timing equipment driven by
the same GPS reciever?
I hope this is now clear.
Chris Albertson
Redondo Beach, California
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think
of anything else that could work reasonably well.
Chris Albertson
Redondo Beach, California
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On Sun, Aug 26, 2012 at 7:31 PM, Kennedy, Paul wrote:
>
> Chris Albertson wrote:
> > The limit of accuracy of the visual clock is the refresh rate of the
> > monitor. One the old CRT monitors there was a vertical sync that ran
> at
> > about 60 to 100 Hz. I think LC
main page VERY tiny
with just a small amount of plain text and links to the pages with
graphics, tables and the like.
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oscillators very well even even with a noisy channel
between them it's used for "everything" mostly clock recovery in serial
data. It in effect figures out the phase by averaging over a great many
cycles. I think a PLL is proff that we CAN synchronize phase to much
better than t
t is accurate to the second but your send out messangers by foot to
> deliver the time to your friend across town. Do you really think that
> buying a new wrist watch is the way to improve the time your friend
> gets?
Chris Albertson
Redondo Beach, California
__
On Mon, Aug 20, 2012 at 9:13 AM, unruh wrote:
> On 2012-08-20, Hahn, Ron wrote:
> > Colleagues,
> >
> > Chris Albertson, made the following statement:
> >
> > --< begin >--
> > I'm using the t-bolt. It seems to work. I guess there migh
timing GPS although they do have PPS outputs.
They work but they are "uSec" level devices. I'd look for 100ns or better.
Chris Albertson
Redondo Beach, California
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nt them anyway... :)
> feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
>
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There are many more like this. You only need the PPS to keep the system
clock running at the correct rate. These Rb units have an typeical error
at the 1E-11 level. Good enough for your use.
>
>
>
>
>
>
> On 08/01/2012 01:24 AM, Chris Albertson wrote:
>
>
), a
stratum-2 server in the US pool (a few of my systems have it in their
list).
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I don't speak for anybody but myself - that's enough trouble.
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use (1) has
> real serial ports and (2) it uses so little power that a cooling fan is not
> required just a passive heat sync that stays cool enough to touch. Oh and
> (3) they are inexpensive
>
> Chris Albertson
Redondo Beach, California
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gt;
> Has others experienced these difficulties with Atom motherboards as
> Stratum 1 servers?
>
> Thanks,
>
> Ron
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then what he needs is an atomic clock. Buy a
few of those $40 Rubidium units that are on eBay
> regards
> pk
>
>
> --
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the above server lines try these:
Server 0.us.pool.ntp.org
Server 1.us.pool.ntp.org
Server 2.us.pool.ntp.org
This way you get a server assigned from the pool.
Chris Albertson
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t.
On Sun, Jun 3, 2012 at 5:23 AM, wrote:
> Can someone help me figure out a really good NTP server near Houston?
>
> Thank you.
>
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On Fri, May 25, 2012 at 2:51 PM, unruh wrote:
> On 2012-05-25, Chris Albertson wrote:
> > On Fri, May 25, 2012 at 12:29 AM, Terje Mathisen <"terje.mathisen at
> > tmsw.no"@ntp.org> wrote:
> >
> >> Chris Albertson wrote:
> >>
> >&g
On Fri, May 25, 2012 at 12:29 AM, Terje Mathisen <"terje.mathisen at
tmsw.no"@ntp.org> wrote:
> Chris Albertson wrote:
>
>> Next how to get the PPS to be at the top of the second. Two methods
>>
>> 1) don't bother. Linux PPS will log the time of bo
thin about 5E-12 or maybe 1E-11.
Thus when GPS fails you have a local clock that you now is "pretty
good" better really than NTP needs and lieu good enough to keep a
cell tower "on frequency" for more than 48 hours.
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specs for a LONG time. It does required some effort to set
up. Just wanted to point out one more option.
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be even the program is smart
enough to detect and drop a common sub-string.
In any case I'd argue that it is a bug to use the same exact string to
represent different servers
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q
problem in
your test plan by interpreting the requirement in some way that actually
makes sense.But really this is such a grossly mis-written requirement
that you should go back to the author.
Chris Albertson
Redondo Beach, California
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Elliott
>
> > -Original Message-
> > From: questions-bounces+elliott.ch=verizon@lists.ntp.org
> > [mailto:questions-bounces+elliott.ch=verizon@lists.ntp.org] On
> > Behalf Of unruh
> > Sent: Friday, April 13, 2012 11:31 PM
> > To: questions@list
ng. I don't
see that from the numbers you post. To prove that you'd need to measure
system and GPS times every couple hours for several days. I think the
difference you are seeing is just the expected noise.
Again for Windows and a USB connected GPS +5 and -5 ms is more or less
On Mon, Apr 2, 2012 at 6:25 PM, Mike S wrote:
> On 4/2/2012 9:13 PM, Chris Albertson wrote:
>>
>> On Mon, Apr 2, 2012 at 4:28 PM, Mike S wrote:
>
> I've played around with different cpufreq setting, thinking it might be
>>>
>>> related to the processor
but that seems to have minimal
> impact (performance vs. conservative vs. ondemand).
>
I think your CPU goes into some power saving mode when there is no
load and takes some number of micro seconds to wake up after an
interrupt. Keeping a load on it prevents the sleep or power save
mode a
urrent version is here.
http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.6p5.tar.gz
In general you can read the docs on the web site but if you have a
detailed question like "what does this flag REALLY do?" you can never
know if the docs are 100% correct or up to date.
--
#x27;t be concerned.
> I get about 300 emails per day from alternate energy mailing lists and
> such. I don't always see new messages very quickly. If you need a
> reply and have not heard from me in 1 - 2 weeks, send your message again.)
>
> Ron Frazier
> timekeepingdude AT c3e
nly way to test the GPS is with some other GPSes. Don't use NTP
to test a GPS. Compare the PPS from each directly with a counter, a
digital scope something you rig up on a breadboard with flip-flops or
whatever you have.
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_
the sure is new enough to use eprom or
flash.
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ase on an RF NPN transistor that switches an 8V
rail, then a short length of wire goes to the DCD pin on the motherboard.
I can not yet measure the performance of this setup.
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On Mon, Mar 19, 2012 at 3:06 PM, unruh wrote:
> On 2012-03-19, Chris Albertson wrote:
> > On Mon, Mar 19, 2012 at 10:25 AM, Alby VA wrote:
> >
> >> On Mar 19, 12:12 pm, unruh wrote:
> >>
> >> > The actual PPS signal at the PPS pin has a rise ti
B converter might work. Serial GPS with PPS would work.
>
> Say he needs + / - 20 us performance. Excluding the realm of rubidium
> standards and such, serial GPS with PPS is probably the only option.
>
> Chris Albertson
Redondo Beach, California
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at UHF.
I guess I could measure a or simulate a level converter but my guess is
that it adds only a few nano seconds of noise. Fixed delays don't matter
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hey have the same 10 pin male header except now they use
0.05 inch sping rather then 0.1
>
>
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t I was making was only that these things are not NTP
specific. Details after that did not contribute the the main point.
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en wait a week or a
month to see how much it has gained or lost you may see quite a bit of
"offset" but now you have good data on the relative rates of the two
clocks
NTP did not invent this trade off, it existed 200 years ago.
Chris Albertson
Redond
ure. Hopefully there is a user manual with
this information.But this 26dB antenna is just an example, there
are many others like it but with different amplifiers inside. (You
can find a Trimble "bullet" if you look) I find the 26dB is enough
for either my Motorola Oncore or my Trimb
onnector can fit inside a waterproof 3/4 inch pipe.
I'd expect it to last for decades, or until struck by lightening.
Chris Albertson
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arrived
> yet.
>
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Is it an "active antenna" These run on 5 volts that is supplied over
the antenna lead. The antenna can a
that has good self diagnostics and
PPS. The self diagnostics part is important
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ce of noise on the PPS line
Are you cable very long. I once tried to used 100 feet of cat-5
cable for PPS and if never worked well
Finally are you 100% certain the GPS is tracking enough satellites
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. If you can measure it you can correct it out in the .conf
file. You'd like for the long term average offset from Internet pool
servers to be zero.
People working at higher levels of accuracy will measure their cables
and account for cable delays but that is over kill for NTP.
Chris Albe
buy the Sure stuff if it saved me a ton of money or
worked better.)
But on the other hand, the Sure GPS works well enough if you can build
a custom serial/PPS cable and then just turn it on. You don't need to
know how it works if you are using it only for NTP.
Chris Albertson
R
tpd.
But really, 3 minutes in not a long time.How often do yo restart
ntpd? Most people let if run for months at a time or longer
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TL?
2) Where is the antenna, what is near it? Anything reflective and how
much of the sky can it see.
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not heard from me in 1 - 2 weeks, send your message again.)
>
> Ron Frazier
> timekeepingdude AT c3energy.com
>
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, but the NMEA
> output has to be referenced to something!
What you read is exactly correct. THERE IS NO SPEC FOR THE DELTA
except they say it can't run over into the next second.
Chris Albertson
Redondo Beach, California
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ch they apply. The worst case reported
error as about 0.9 seconds which is within spec.
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ver USB-emulated
RS232. For a server or device with this as the only USB device, the
jitter should be fairly consistent, and the latency lower than ethernet.
--
Chris Adams
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's e
is below some threshold. Then the NMEA
data are output. the number of required iterations might vary slowly
over a 12 hour period
After all this the only spec the engineer absolutly had to meet was
"the NMEA data shall be output within the second to which i
they only have to be output "sometime within" the second to which they
apply.It seems that your GPS is following the letter of the spec.
So I think you are correct to blame the GPS.
Chris Albertson
Redondo Beach, California
___
questions ma
On Tue, Mar 6, 2012 at 10:21 AM, Dennis Ferguson
wrote:
>
> On 5 Mar, 2012, at 18:33 , Terje Mathisen wrote:
>
>> Chris Albertson wrote:
>>> How to measure? You need to modify the interrupt handler to raise a
>>> pin on a (say) parallel port. then measure the ti
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