Date   : Tue, 12 Sep 2006 16:23:48 +0100
From   : "David Harper" <dl.harper@...>
Subject: Re: Bugs in ArmCoPro OS

Greg Cook wrote:

> Try the DFS User Guide.  "On exit: A=0 implies operation attempted."
> (The Advanced User Guide claims A is preserved.  I'm going with the
> official doc.)

On the other hand, the "official" Master Reference Manual (on page J.11-5) 
states that A should be preserved.

It seems there are two quite different "official" protocols. Maybe the 
approved behaviour was changed at some point.

In practice, Acorn DFS and ADFS return with A=0 "if the operation was 
attempted", but I am not sure how many other filing systems follow this 
pattern.

David Harper