Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!gem.mps.ohio-state.edu!brutus.cs.uiuc.edu!psuvax1!ukma!phoenix
From: phoenix@ms.uky.edu (R'ykandar Korra'ti)
Newsgroups: comp.sys.cbm
Subject: Re: Dead C64
Keywords: dead budgie
Message-ID: <12954@s.ms.uky.edu>
Date: 16 Oct 89 18:12:18 GMT
References: <438@stretch.MUN.EDU>
Reply-To: phoenix@ms.uky.edu (R'ykandar Korra'ti)
Organization: El'n'tk National Spaceport, Mission Control
Lines: 26

/Line eater? What line eater?/

In article <438@stretch.MUN.EDU> dave3@stretch.MUN.EDU (Dave Fifield) writes:
>When I turn it on, the cursor immediately begins to move down the screen
>(as if someone was holding down the return key) and continues ad infinitum.
[Useful Stuff Deleted]
>This leads me to think that my problem involves the 6526 which controls the 
>port (and the keyboard also?). All advice, fault testing methodology, or just 
>wild speculation is welcome.
Dave -
     The C64 has two CIA chips; if yours are socketed (mine were, but many
aren't), pull them both and switch them. If the problem changes, then you're
clearly right. If it doesn't; hm. I don't know.
     It definately sounds like locked bits on the CIA to me. (I had a joystick
port "lock" that way, and it was the CIA chip; I think a friend of mine had the
same problem you have, and it was again the CIA.)
     Oh, just our of curiosity; can you still type anything else? Also, if
you can, hit the quotation mark (Shift-2) and see what happens. (This is
just something "fun" to do, and not related to solving the problem.) If
you get graphics symbols, it's not getting a RETURN. (Actually, this would
let you figure out which pin on the CIA is locked, but since nobody repairs
the little buggers, that's useless information...)
                                                     - R'ykandar.
-- 
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