Subject:
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Re: Memory system problems
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 30 Jun 1997 15:50:39 GMT
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Original-From:
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Thomas S. Gibson <tgibson@black.clarku.edu{AvoidSpam}>
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Viewed:
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1376 times
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Robin, out team has had the same problem. And after much of the following
troubleshooting, we narrowed it down to a faulty 6811. We replaced the
chip and everything ran smoothly. Unfortunatly, I couldn't tell you how
the chip was damaged, as it did work before.
Also, did you recheck the joints actually on the LCD screen data path?
Hope this helps,
tg
On Mon, 30 Jun 1997, Robin F Beggs 803282-9245 wrote:
> Hi,
>
> I have been building my first handy board and I've managed to
> get things working until 6.0.5. My board downloads the pcode_hb.s19
> file successfully, but when I reboot the LCD continues to show the
> single row of blocks and no beep. I have done the following to try
> and locate the problem:
>
> (1) I saw one posting that it could be the LCD display and
> another that said that the board would an make audible
> clicking sound if the LCD was removed. I tried that without
> success.
>
> (2) I rechecked all the solder joints. Reheated those that looked
> suspect.
>
> (3) I ran IC to see what would happen. Here is what I got:
>
> BOARD DISCONNECTED OR NOT RESPONDING, RETRYING.
>
> (4) I reran DL PCODE_HB.S19 and did not reset the board and then ran
> IC. Here is what I saw:
>
> ATTEMPTING TO LINK TO BOARD ON COM1
> SYNCHRONIZING WITH BOARD
> PCODE VERSION 2.81 PRESENT ON BOARD
> CANNOT FIND FILE /IC/LIBS/LIB_R22.LIS OR FILE ...
> TYPE 'HELP' FOR HELP
> C>
> I TRIED 1 + 2;
>
> Downloading 7 bytes (Addresses c200-c206);
> Board sync error: looking for prompt, got 11
> SYNCHRONIZING WITH BOARD
>
> The board then hangs.
>
> (5) I then reset the board in download mode and ran only
> DL CONFIG0C.S19 and ran IC as above with the same results.
>
> (6) To confirm that the CONFIG0C.S19 file did not have the
> 2.81 version somewhere in the file I unplugged the memory
> power and retried set 5 with the following result:
>
> PCODE VERSION 0.00 PRESENT ON BOARD
> INCOMPATIBLE PCODE VERSION, OR PCODE CORRUPT
>
> (7) I rechecked power to the RAM and it was 5 volts as it
> should be. It looks like from the above that it's saved
> during reset.
>
> I don't have an Oscilloscope or logic probe to test every part
> of the memory system. Does this give any suggestions as to where
> the problem might be?
>
> I'm a programmer by trade is there a way to narrow down the problem
> with code? I plan to order the documentation on the processor
> tomorrow. Does this sound possible?
>
> Radio Shack has a $99 oscilloscope. Would this work in tracking
> down the problem?
>
> Robin
>
>
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Message is in Reply To:
 | | Memory system problems
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| Hi, I have been building my first handy board and I've managed to get things working until 6.0.5. My board downloads the pcode_hb.s19 file successfully, but when I reboot the LCD continues to show the single row of blocks and no beep. I have done (...) (27 years ago, 30-Jun-97, to lugnet.robotics.handyboard)
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