[Coco] ceramics ...

[jdaggett at gate.net]

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,
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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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