Subject:
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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 12:25:59 GMT
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Original-From:
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Robin F Beggs 803282-9245 <beggsrf@bowincNOMORESPAM.com>
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Viewed:
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1412 times
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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 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 has 1 Reply: | | Re: Memory system problems
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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 (...) (27 years ago, 30-Jun-97, to lugnet.robotics.handyboard)
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