Subject:
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Re: downloading
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 21 Jun 1996 17:42:32 GMT
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Original-From:
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Curt Mills <hacker@tc+saynotospam+.fluke.com>
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Viewed:
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1568 times
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> From: "Dirk W. Edmonds" <dedmonds@cs.umn.edu>
>
> I, too, have had problems downloading pcode to the latest handy board I
> have built. I have replaced every ic with the ic's from a working handy
> board, and have tested each trace from all 4 of the ic's that were
> installed (6811, 132, 62256 and the one beneath it (I forget the number)).
> If you know of something else to try, it would be greatly appreciated.
>
> One thing I did see but can't figure out is that the E clock looks "bad"
> (with the oscilloscope) on this board (even using a 6811 that came from a
> working handy board). I.e. it is not a symmetrical square wave, and there
> are some pieces which go "down" while most go "up". THis is sort of how it
> looks:
>
> ___ _ __
> __| |__| |_ __| |__
> |_|
>
> The crystal output looks fine, and I am not aware of any other external parts
> that can affect a 6811's E clock output. Any ideas?
I would say you should check for a short between the E Clock and another trace.
Curt Mills, WE7U.
hacker@tc.fluke.com
archer@eskimo.com
we7u@we7u.ampr.org
http://www.eskimo.com/~archer
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