13 Mar
2008
13 Mar
'08
9:37 p.m.
I have some strange frequency crystals and oscillators.
Does anyone remember what "standard" they represent?
3.595295 MHz
13.824 MHz
18.72000 MHz
15 Mar
15 Mar
6:56 a.m.
Jeff Jonas <jeffj at panix.com> writes:
3.595295 MHz
That's the crystal frequency used in Atari's Pong:
http://www.atarimuseum.com/videogames/dedicated/pong_schematic.gif
13.824 MHz
12 times 1.152 MHz, which is used as a data rate in IRDA, DECT and
various other communications standards.
--
Adam Sampson <ats at offog.org> <http://offog.org/>
10:54 a.m.
From: ats at offog.org
Jeff Jonas writes:
> 3.595295 MHz
TV color crystal frequncy. Any time one needs to create color display
through a TV set, they'd use one of these.
These are also the cheapest crystal out there since they are
used in most every color TV.
I see these a lot where a 4MHz would work but the controller was
built with cost in mind and 3.6MHz was fast enough.
Dwight
That's the crystal frequency used in Atari's Pong:
http://www.atarimuseum.com/videogames/dedicated/pong_schematic.gif
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13.824 MHz
12 times 1.152 MHz, which is used as a data rate in IRDA, DECT and
various other communications standards.
--
Adam Sampson
12:06 p.m.
dwight elvey <dkelvey at hotmail.com> writes:
No, that's 3.579545 MHz (or 4.43361875 MHz for PAL) -- this one's a
bit faster than the NTSC colourburst, which presumably is what makes
it unusual...
Colourburst crystals do show up in quite a few computing devices,
though. I built a couple of Z84C00 machines running at the PAL
colourburst rate in the mid-1990s.
--
Adam Sampson <ats at offog.org> <http://offog.org/>
3.595295 MHz
TV color crystal frequncy.
4:20 p.m.
To: cctalk at classiccmp.org
From: ats at offog.org
Date: Sat, 15 Mar 2008 16:06:28 +0000
Subject: Re: strange xtal frequencies
dwight elvey writes:
No, that's 3.579545 MHz (or 4.43361875 MHz for PAL) -- this one's a
bit faster than the NTSC colourburst, which presumably is what makes
it unusual...
You are correct. That is 1 out of two today.
Dwight
3.595295
MHz
TV color crystal frequncy.
Colourburst crystals do show up in quite a few computing devices,
though. I built a couple of Z84C00 machines running at the PAL
colourburst rate in the mid-1990s.
--
Adam Sampson
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5:10 p.m.
dwight elvey <dkelvey at hotmail.com> writes:
No, that's 3.579545 MHz (or 4.43361875 MHz for PAL) -- this one's a
bit faster than the NTSC colourburst, which presumably is what makes
it unusual...
To be pedantic there are several PALs (including at least one 525 line
one), and I asusme several NTSC-like standards, all of which have
slightly different colourbust frequencies. I don't konw of any that's
3.59... MHz, though.
3.595295
MHz
TV color crystal frequncy.
Colourburst crystals do show up in quite a few computing devices,
though. I built a couple of Z84C00 machines running at the PAL
colourburst rate in the mid-1990s.
The Science of Cambridge MK14 clocked the SC/MP at 4.43... MHz,
presumably because that was the cheapest crystal around. And 3.57... MHz
xtals turn up all over the place, including in things which have nothing
at all to do with video
-tony
12:20 p.m.
dwight elvey wrote:
No, color freq is 3.579545. So that one above is a little weird (or
maybe the OP mistyped it?)
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
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> 3.595295 MHz
TV color crystal
frequency. Any time one needs to create color display 
11:52 p.m.
On Saturday 15 March 2008 10:54, dwight elvey wrote:
Nope, that's 3.579545 MHz...
From: ats at
offog.org
Jeff Jonas writes:
> 3.595295 MHz
TV color crystal frequncy. Any time one needs to create color display
through a TV set, they'd use one of these. These are also the cheapest crystal out there since
they are
used in most every color TV.
Yeah, they are pretty common, as well as some that are multiples of it --
like 14.31818 MHz, used in a *lot* of stuff.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
16 Mar
16 Mar
12:43 a.m.
Roy J. Tellason wrote:
Yeah, they are pretty common, as well as some that
are multiples of it --
like 14.31818 MHz, used in a *lot* of stuff.
PC's come to mind. :)
PS. get them quick ... the company closes march 21.
Imagine my delight upon learning that there is NOS
available of CARDIAC: Cardboard Illustrated Aid to Computing, the Bell
Labs
fold-flat computer that taught me so much about assembly language computing. Hurrah!
In 1961, Bell introduced four kits to aid science education at the high school level. In
1968, they made a fifth kit available, called CARDIAC.
Get 'em while their hot-- stock won't last long. I don't think these prices
are accurate anymore, there's an email address for inquiries, since the company is
going out of business. CARDIAC, $19.29, and Vu-Graph for CARDIAC $22.95. I have no idea
what a VuGraph might be and don't think I've ever seen one. But I still have my
trusty CARDIAC, given to me by my 5th grade teacher at the end of the year.
http://www.boingboing.net/2008/03/11/newold-stock-of-bell.html
http://www.porticus.org/bell/belllabs_kits.html
1 a.m.
On Sunday 16 March 2008 00:43, woodelf wrote:
Roy J. Tellason wrote:
Yup. And c64s, too, and I forget what all else but I've run into that one
in a bunch of places...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Yeah, they are pretty common, as well as some
that are multiples of it
-- like 14.31818 MHz, used in a *lot* of stuff.
PC's come to mind. :)
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