Path: utzoo!attcan!uunet!cs.utexas.edu!samsung!uakari.primate.wisc.edu!ames!amdahl!pacbell!sactoh0!pacengr!americ!erk
From: erk@americ.UUCP (Erick Parsons)
Newsgroups: comp.sys.amiga
Subject: Re: Flakey Keyboard
Message-ID: <02610.AA02610@americ.UUCP>
Date: 17 Mar 90 14:02:23 GMT
Followup-To: comp.sys.amiga
Distribution: na
Lines: 44


From: LDSHANER@MTUS5.BITNET (Leon D. Shaner) Message-ID: <90074.155758LDSHANER@MTUS5.BITNET>

>I have the same intermittent keyboard locking problem, which leaves all other
>computer functions working just fine.  My problem is compounded with the fact
>that after the keyboard has been sitting for a few minutes, without use, the
>first key I press usually results in a continuous flow of a single repeating
>character (other than the one I type).  For instance, I'll start a shell
>excracting something from an archive.  While I wait I flip over to a term
>program and read my mail.   When I go back to the shell I immedately hit the
>up arrow and a row of dddddd's starts to flood my window until I hit another
>key, which stops it.

Hmmm... I just tried something interesting on my A500 keyboard that looks
like the same symptom. Try this:

Go to any key and hold it till it starts repeating. While holding that key
press another key and note that the first key (still being pressed) gives
way to the second key pressed and stops repeating. Even while holding the
first key. The keyboard will work fine even with the first key stuck down.

Summary: You might just have a stuck key somewhere. 
         Try getting a hold of somebody elses keyboard and see if the
         problem persists. If not look to one of the 8520's

If you find that this is not the problem you might just have to replace
the 6570 chip that is responsible for decoding the keyboard. There is
also a 7423 STROBED Nor gate in there that might be malfunctioning.

You might want to start comparing versions and run numbers (if possible)
with somebody else who is having this problem as it could have been a 
bad batch of chips that slipped through QC at the manufacturer for your
particular run.

G'luck


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