Subject:
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Re: Handyboard Assembly Problems
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 17 Jun 1999 17:12:56 GMT
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Original-From:
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BART_SCHRIJVER@HP-SONOMA-OMstopspam2.OM.HP.COM
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Viewed:
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815 times
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Umar:
This may sound trivial to others, but here is what I think you should
do.
When a new handyboard is switched on without any software loaded that
drives the LCD display, you should see the first line fully dark and
the second line light. So what you see is normal.
When you bring the HB in download mode, the situation stays the same.
Then when you download software like IC, after the download process
completes the LCD remains in that condition.
You have to switch your board on and off to reboot and start the
loaded program, this is when the LCD will show: Interactive C
version 2.8.1 plus a heart beat if IC is loaded. Since the HB is
used in Special test mode, the reset vector is at $BFFE, $BFFF and
should point to $C5000 where IC starts.
When you have done all of this or already did this and the situations
remains the same, you could try to use dlm downloader in DOS, which
checks every byte that downloads and sees if it arrives with the
correct value. This checks out access to your SRAM chip and all the
driver logic to it. It might be that one of the 74HC chips is busted
and that you miss one or more of the data or address lines which
prevents any program from running. The above check with dlm should
reveal this though.
Hope this helps, Bart Schrijver.
______________________________ Reply Separator _________________________________
Subject: Handyboard Assembly Problems
Author: Non-HP-ukhan (ukhan@engr.umbc.edu) at HP-PaloAlto,mimegw2
Date: 6/17/99 4:11 AM
I am assembling a handyboard, and am at stage 6.0.4, where I plug in my
LCD screen for the first time. When I turn the handy board on, instead of
getting the dimly lit arrays, I get a top array that is strongly lit, and
bottom array that is lightly lit. The LCD screen is LM052L. I checked the
power and ground and they seem to be ok.
The download process goes fine, but there is no interactive C
prompt. I also checked the orientation of chips and they all seem ok.
Finally I did a continuity check and that seems alright too.
To all the experts out there, I'd really appreciate your help.
Regards,
Umar
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Message is in Reply To:
 | | Handyboard Assembly Problems
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| I am assembling a handyboard, and am at stage 6.0.4, where I plug in my LCD screen for the first time. When I turn the handy board on, instead of getting the dimly lit arrays, I get a top array that is strongly lit, and bottom array that is lightly (...) (25 years ago, 17-Jun-99, to lugnet.robotics.handyboard)
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