> I'm trying to get to the bottom of whether or not any computing equipment
> made around the advent of UNIX systems (or any time-slicing system) used
> the mains cycles of 60Hz as phase lock for the internal system clock.
The IBM 360 series bumped a register in low memory by 300 counts per secon
Hi Jean-Louis,
I grew up in Borås. ;-) Actually I spent quite some time less than 5km
away from SP - where I guess you had your business. There is a "hole" in a
skyplot where we never see GPS birds, but it is somewhat compensated with
SVs rising quite a bit over the north pole. Less high elevation
Chris Smith-
"I only joined this list a few hours ago and hadn't searched the archive for
which I apologise."
--
No need to apologize. I didn't intend my post to sound like that. this list has
lots of good information but it isn't that e
You have a point.
Semiconductors have burned brightly and furiously. Tubes maybe made it through
4 or 5
generations from start to present.
Still, I can think of things to do with old 45's, but the thought
of putting an RTL chip in a circuit leaves me cold. I'd rather wire
up the logic with di
We bought a bunch of PDP-11/23s as part of a communications network
system. After successful acceptance tests in Boston, MA, the systems
were commissioned in Sweden with 50Hz AC. To make the RSX-11M O/S
time-of-day clock run OK, the developers modified some piece of code.
Uno Staver
Bill Ha
Chuck Harris wrote:
> Ah the old days! Why is it old semiconductor devices seem much more ancient
> than
> old vacuum tube devices?
What generation of semiconductor devices are we currently on?
What generation of tube devices?
:-)
-ls-
___
time-n
I used to reclaim hundreds of the 2N3638's and 3643's in that ceramic
package. I rather unceremoniously yanked them from PC boards after heating
the solder side with a propane torch. I always tested the pulled parts, and
I can't remember ever finding a bad transistor in that package.
I wonder i
Here is a link to a datasheet for the uL923:
http://wps.com/archives/solid-state-datasheets/Datasheets/Fairchild-uL923/1.JPG
Ah the old days! Why is it old semiconductor devices seem much more ancient
than
old vacuum tube devices?
-Chuck Harris
Rob Kimberley wrote:
I stand corrected. On ref
IMO, ANY of those jelley beans are garbage, IMO, including 900, 914, 923,
2N3638 -> 2N3643. The TO-5 size seem worse than the TO-18 size.
FWIW,
-John
=
> I found the twisting of leads more of a problem with common epoxy packaged
> transistors than the 8 pin RTL 914/923 devices
Arthur
On 19 Apr 2010, at 20:48, Arthur Dent wrote:
> You may have missed my post yesterday where I said:
> "I had a thunderbolt that displayed a temperature reading of -54.99°C, which
> I was pretty sure wasn't correct. ;-) Apparently the reference in the
> DS1620
> chip either shorted or
I found the twisting of leads more of a problem with common epoxy packaged
transistors than the 8 pin RTL 914/923 devices. Regards - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo
Chris Smith-
"The first thing I noticed was the Temp pane in TBOLTMON shows -30.8C."
-
You may have missed my post yesterday where I said:
"I had a thunderbolt that displayed a temperature reading of -54.99°C, wh
RTL was a VERY simple design. a 2 input NAND had 2 transistors and 3
resistors as I remember.
The main issue was lead attachment was the main failure mode in the
epoxy-ceramic 8 lead packages. If you twisted a lead, the device died.
-John
==
> I stand corrected. On reflection, I se
I stand corrected. On reflection, I seem to remember a lower supply voltage
on the RTL, although 3.6 doesn't ring a bell. Do remember that it was very
temperamental logic family. Used to get lots of catastrophic failures on the
DMM product range (which I believe SD acquired from Fairchild).
Rob
-
Hi
I'm new to this list having been recommended to try here for a solution to my
problems by Tom Holmes, N8ZM.
I have a 2nd hand Trimble T-bolt which I am trying to use to provide a GPSDO
10MHz reference for my High Performance Software Defined Radio (HPSDR).
I bought the unit from an outlet i
DTL had essentially the same specs as TTL. It was an evolutionary step.
RTL was a strange beast, and ran off of 3.6V. There is no inherent reason
that there couldn't have been multiple families that used different supplies,
but I only remember the 3.6V variety.
-Chuck Harris
Rob Kimberley wro
At 18:33 19-04-10, you wrote:
The 103AR manual is available for download at the to-way.com Web
site under test Equipment Manuals--HP
Had
K7MLR
Thanks! Just downloaded.
Marco IK1ODO
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RTL and DTL used 5.0V. I used to service Systron-Donner kit back in the
early 70's, and we had a bunch of RTL and DTL stuff.
Rob K
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of jmfranke
Sent: 15 April 2010 7:49 PM
To: 'Discussion of p
The 103AR manual is available for download at the to-way.com Web site
under test Equipment Manuals--HP
Had
K7MLR
At 09:29 AM 4/19/2010, you wrote:
Hello Ulrich,
of course the 103AR would be nice to have. My email should get it,
but I agree that it would be better to send it to Didier's si
Hello Ulrich,
of course the 103AR would be nice to have. My email should get it,
but I agree that it would be better to send it to Didier's site.
As you prefer... I'm QRV.
About the messages to Rick four years ago, I found no replies. Does
Rick still have the manuals? Rare things sitting on a
You could also upload the 10 MB file to didiers website so everyone could
have access.
It can handle very large files and is a spectacular resource for us fix-it
type of guys.
Heck check that site and the HP musuem it may be there already
On Mon, Apr 19, 2010 at 11:16 AM, Ulrich Bangert wrote:
>
Marco,
I have a scanned manual of the HP103AR (direct predecessor of the 104)
available that should be better than nothing. However it is appr. 10 MB big.
Can I attach a file of that size to a mail to your direct address?
Best regards
Ulrich, DF6JB
> -Ursprungliche Nachricht-
> Von: time
Hi all,
just got a very nice HP 104AR (1963 vintage) for my collection. It
seems to work, but... anyone has a manual in PDF, ot at least a schematic ?
73 - Marco IK1ODO
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