[Coco] ceramics ...
jdaggett at gate.net
jdaggett at gate.net
Sat Sep 4 23:53:56 EDT 2004
Boisy
I have 23 yrs experience designing portable paging devices for
Motorola. I have extensive RF, digital and analog design
experience. I also hold a technical degree is Computer Technology
and a BSE in Electrical Engineering. I have been part of the design
of an IC used in portable paging products. I am very intimate on
how Motorola designs and specs IC's as I have written over a dozen
IC test and performace specifications.
I have written the test requirements for paging products. While
these are not submarines, I worked in large volume manufactureing.
1 million units per yr was typical.
I have my experience and my knowledge and that is one thing that
noone will ever take away.
james
On 4 Sep 2004 at 7:48, Boisy G. Pitre wrote:
From: "Boisy G. Pitre" <boisy at boisypitre.com>
Subject: Re: [Coco] ceramics ...
Date sent: Sat, 4 Sep 2004 07:48:44 -0500
To: CoCoList for Color Computer Enthusiasts
<coco at maltedmedia.com>
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> Great response! Wonder what he'll say next?
> --
> Boisy G. Pitre
> E-Mail: boisy at boisypitre.com
> Mobile: (337) 739-7584
> Web: www.boisypitre.com
>
> On Sep 4, 2004, at 7:44 AM, Mark Marlette wrote:
>
> > At 9/3/2004 10:29 PM -0400, you wrote:
> >
> > james,
> >
> > A major test manufacture did this as their interface in to the
> > digital test engine. 100MHZ resolution, min, max, and no mans
> > land(three state) detection on the digital signal. I was a Test
> > Engineer on this system. I knew this system inside and out. So well
> > in fact the company hired me and ran the Midwest Regional Office for
> > six years.
> >
> > Again, design for it and it will work. We did it, not once, but on
> > over 50 test interfaces over several years.
> >
> > I never said ringing was due to the clock. Please go back and
> > re-read my statement. I would also say that ringing was not from my
> > wire wrap board either. It was from the impedance mismatches of the
> > transmission line that was the wire wrap. We learned to twist the
> > wire wrap at 8-10 twists per inch to match the line. Termination was
> > also required. In the end, a board could run 24/7 on this tester,
> > thinking it was in the system and we could check prop delays,
> > ringing, low level driver outputs, etc..... It worked and well.
> > These were digital data transmission systems that are employed today
> > in the Navy's ships and SSN class submarines.
> >
> > Text book to real life experience. You must use them both.
> >
> > Mark
> >
> >
> >
> >> Mark
> >>
> >> The mismatches and ringing are not due to the clock but due to your
> >> wire wrap board. I would never wire wrap any board that operated
> >> any clock over 2 MHz. Basic understanding of reflection
> >> coefficients and transmission line theory can tell you that far
> >> better than any $500K digital tester can.
> >>
> >> james
> >>
> >> On 3 Sep 2004 at 16:10, mmarlett at isd.net wrote:
> >>
> >> From: mmarlett at isd.net
> >> To: coco at maltedmedia.com
> >> Date sent: Fri, 3 Sep 2004 16:10:59 -0500
> >> Subject: Re: [Coco] ceramics ...
> >> Send reply to: mmarlett at isd.net,
> >> CoCoList for Color Computer Enthusiasts
> >> <coco at maltedmedia.com>
> >> <mailto:coco-
> >> request at maltedmedia.com?subject=unsubscribe>
> >> <mailto:coco-
> >> request at maltedmedia.com?subject=subscribe>
> >>
> >> > Paul,
> >> >
> >> > That would then point to a motherboard issue.
> >> >
> >> > I have done 10MHZ with wirewrap on a $500K digital tester.
> >> > Results
> >> and
> >> > not real good for repeatability. TONS of ringing due to
> >> > reflections, mismatches and coupling. 40MHZ, lucky???
> >> >
> >> > What did your display look like??? Could you correct the monitor
> >> > enough?
> >> >
> >> > Mark
> >> > >--- mmarlett at isd.net wrote:
> >> > >
> >> > >> james,
> >> > >>
> >> > >> Common knowledge for most. Kind of like telling
> >> > >> my Son that just because
> >> > >> the RPM gauge runs in the RED doesn't mean the
> >> > >> engine will run forever
> >> > >> there.
> >> > >>
> >> > >> The GIME, TCC1014A....Same thing here, sure you
> >> > >> can run it faster. I have
> >> > >> modified the XTAL to 32MHZ for a true 2MHZ and
> >> > >> adjusted the internals of my
> >> > >> monitor to compensate. My experience has been
> >> > >> that the GIME/motherboard or
> >> > >> whatever becomes unstable. This is my personal
> >> > >> experience. Roll them back
> >> > >> and they work just fine. All my mod'd machines
> >> > >> have all been returned to
> >> > >> stock speeds due to reliability reasons.
> >> > >>
> >> > >> What overclocking have you done to the GIME and
> >> > >> what were your results?
> >> > >> Please provide revision information, if
> >> > >> relevant to your test cases.
> >> > >>
> >> > >> Mark
> >> > >--snipped--
> >> > >
> >> > >I've run my hand-wired cocozilla at 40MHz,
> >> > >runs fine.
> >> > >
> >> > >Paul Barton
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >_______________________________
> >> > >Do you Yahoo!?
> >> > >Win 1 of 4,000 free domain names from Yahoo! Enter now.
> >> > >http://promotions.yahoo.com/goldrush
> >> > >
> >> > >--
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> >> > >
> >> >
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> >>
> >>
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