[Coco] ceramics ...

[Boisy G. Pitre]

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
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >_______________________________
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>> >
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