Subject:
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Re: HB bootstrap problem when U6 installed
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 3 Feb 1999 18:25:40 GMT
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Original-From:
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Fred G. Martin <fredm@media.mit.^spamless^edu>
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Viewed:
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2843 times
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I assume you've tried other HC138's, and that it's not a case of a
faulty chip?
fred
In your message you said:
> One of my students is having a problem in assembling their HB:
>
> Downloading and executing IC works fine _until_ U6 is installed. After
> installing U6 ('138) the GRN LED doesn't quite go off when putting the
> board in bootstrap mode, it glows faintly. And we can't download the
> bootstrap.
>
> If U6 is removed, everything is fine, the GRN LED goes off when put in
> bootstrap mode, all downloading is fine.
>
> We did have to change 6811s to get this far (original one didn't work), but
> it seems solid now, but only if U6 not installed.
>
> Any suggestions?
>
> --greg
>
> *****************************************************************
> * Greg Starr, Professor *
> * Department of Mechanical Engineering ph (505) 277-6298 *
> * University of New Mexico, Albuquerque NM 87131 FAX 277-1571 *
> * email- starr@unm.edu WWW- http://www.me.unm.edu/~starr/ *
> *****************************************************************
>
>
>
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Message is in Reply To:
 | | HB bootstrap problem when U6 installed
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| One of my students is having a problem in assembling their HB: Downloading and executing IC works fine _until_ U6 is installed. After installing U6 ('138) the GRN LED doesn't quite go off when putting the board in bootstrap mode, it glows faintly. (...) (28 years ago, 3-Feb-99, to lugnet.robotics.handyboard)
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