Hi Mouse,  

Thank you for taking the time to answer me in such detail.  I don't
want you to think I haven't read your message.  I have, and I'm still
baffled.  Not by what you said -- although I don't have a scope and you
definitely understand this stuff at a level I don't -- but because
like you I haven't been able to form a coherent theory.  

The server still crashes intermittently, but mirabile dictu has been up
for 4 days.  Soekris shrugged, not something they've seen before.  I
found another power supply, albeit only 1100 mA, but haven't tried it.  

On Tue, 5 Jun 2012 03:32:40 -0400 (EDT)
Mouse <[email protected]> wrote:

> This looks to me as though output is corrupted in the presence of
> input occurring at the same time.  Does the speed with which you type
> "show" matter?  

No.  

> For example, if you do it manually versus pasting it, does it affect
> the syndrome?  

No. Well, sort of.  After it's booted, at the login prompt, on the
machine that usually (not always) doubles the letters, I see this on
pasting:

        I paste: jklowden
        I type a space
        I paste: hello
        Total output: jklowdenjklowden àhelloxello

        Several pastings of "hello":
        helloxellohelloxellohelloxello

        Typing hello at different speeds:
        hxeelllloohxeelllloohxeelllloohxeelllloo

This is *not* identical to the previous test; it was just easy to do.
I'm on a different board, and I'm at the NetBSD login prompt.
Sometimes changing multiple factors makes isolation easier.  

[ground isolation experiment]

> (I realize that some/all of these may not be easy for you to test....)

Yes.  ;-)

I've always found breakout boxes too expensive to bother with;
replacing the cable and/or trial-and-error always solved the problem
cheaper.  But this sure is one time I could use one.  

Regards, 

--jkl
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