[Coco] ceramics ...

[Mark Marlette]

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>
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>
> > 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
> > >
> > >
> > >
> > >
> > >
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