Subject:
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LCD & serial connection
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 24 Apr 1997 03:31:17 GMT
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Original-From:
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Tunde <SAC78395@SACLINK.CSUS.spamcakeEDU>
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Reply-To:
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t.gyurics@!NoMoreSpam!ieee.org
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Viewed:
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2816 times
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Thanks to those of you who sent your suggestions regarding the message
below. I tried it all (replacing the LCD, checking each pin on both the
RAM and the octal transparent latch 74HC373 for continuity, double
checking the installed parts, I even replaced the memory chip) but after
the pcode_hb.s19 file is downloaded, the board still won't beep and the
LCD still does not display any messages. If there is anyone who has any
other suggestions, I would appreciate it.
Tunde
Tunde Gyurics wrote:
> I am still trying to get the PC-Handyboard connection to work. I got as
> far as downloading the pcode_hb.s19 file successfully. After I turn the
> main board power off and back on (reset), I should get a message on the
> LCD screen ("Interactive-C v 2.81 9/28/93...") but instead the LCD screen
> just stays lit on, without displaying any messages.
and then Chuck McManis wrote:
> Your LCD is bad. Either the logic to it is in error (check for
> an open on the E pin) or the LCD itself is non-functional.
> If IC cannot talk to the LCD it won't run.
Not necessarily. There could be a problem with the memory circuit
that is preventing pcode_hb.s19 from loading properly.
Tunde, use a multimeter to check all of the connections in the memory
circuit (including the 'hc373 chip). Make sure there are no adjacent
shorts, and that all wires that should be connected are connected.
-Fred
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Message has 1 Reply:
 | | Re: LCD & serial connection
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| It is possible you have a bum 6811. I have seen 6811's with bad output address lines. this causes mirroring in the RAM as what should be multiple locations get mapped to the same byte in memory. The downloader thinks things are working because each (...) (28 years ago, 24-Apr-97, to lugnet.robotics.handyboard)
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