Re: Strange Problem Amiga 2000

From: silverdr_at_wfmh.org.pl
Date: Sun, 7 Oct 2018 20:55:32 +0200
Message-Id: <37E7AD19-7E38-4058-9462-2FD4B74B0EF7@wfmh.org.pl>
> On 2018-10-06, at 14:41, Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote:
> 
> This might not be quite the right place, but the Amiga was made by Commodore after all...
> 
> Anyway, I have an Amiga 2000, PAL, the early model that uses a multilayer board and the A1000 chipset, that exhibits a strange problem.
> 
> [...]
> 
> Since this A2000 will not be expanded but mostly used for games, I can live with KS1.2, but some part of me hates unexplained errors of the 'all parts work by themselves, but not when used together' kind.

It's a long shot but I twice solved "illogical" (surprisingly also with A2000) issues by finding and replacing (with FB) partially faulty EMI filters. I don't have A2K schematics at hand now (does this revision have Gary?) but since it looks somehow related to floppy circuits (Gotek vs. regular floppy) and possibly a sort of edge-case timing issue - I'd possibly check also around Gary and floppy lines, which can have some EMI filters around the external connector.

-- 
SD! - http://e4aws.silverdr.com/
Received on 2018-10-07 21:00:06

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