Subject:
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Hardware Problems
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 16 Apr 1997 01:52:21 GMT
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Original-From:
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John Hillhouse <jhillhouse@top.&avoidspam&monad.net>
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Viewed:
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1453 times
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Hello,
I'm having trouble getting my Rev 1.2 Handy Board up and running. It did
work once and then the following symptoms:
I start the mac based down loader, which download the bootstrap code fine.
Both charger board and the handy board's serial light flickers. Once the
down loader tries to send the p-code the handyboard's serial light stops
flickering and gets slightly brighter. The charger board acts as if it's
send the full p-code. IC cannot sync with the board after reset.
I have tried the following:
-checked all joints.
-replaced the following with the listed parts.
74HC244N w/ SN74LS244N
MCM60L256A w/ 62256A
CD74HC373 w/ SN74LS373
Supply and GND check fine for the memory circuit.
Any thoughts or suggestions??
thanks
John Hillhouse
jhillhouse@monad.net
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Message has 1 Reply:
 | | Re: Hardware Problems
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| (...) All I can add is that is what mine does, and it seemed to break when I hooked up a 'normal' 12V battery charger, which is opposite polarity to the HB charger requirements. According to the diodes in the diagram, this shouldn't be a problem, (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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