Re: ZIPGS 2-pin Crystal

[mjmahon@aol.com (Michael J. Mahon)]

>Wayne Stewart replied:

>"Michael J. Mahon" wrote:
<snip>
>> My conclusion is that something else changed to make your
>> card more stable.  Like swapping two nominally identical chips
>> which are different in actual speed, or getting a less "noisy"
>> contact between a chip and a socket which was either damaged
>> or had some dirt in it.
>
>Possible but I removed the SRAM on one card, changed the sockets 
>and put the same SRAM back in and it went slightly faster. Then 
>I did the same on the second card and it went slightly faster. 

That's pretty good evidence as far as I'm concerned!

<snip>
>> Good advice, then, is to try pushing the speed until you find
>> the fastest point where it is still reliable, then back off 10%,
>> to allow for variations in the parameters you are not controlling.
>
>I usually suggest that too but I never do it unless it's mission 
>critical. I always like pushing things. 

I hear you.

But a "silent error" can inspire lots of superstitious behavior. ;-)

Reminds me of one of my favorite instruction manual passages,
from an HP 2100 manual:

"Errors which are not detected will be treated as if they
had not occured."

-michael

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