[B2-devel] (no subject)

[L. <jue...@t-...>]

=?iso-8859-2?Q?From?=
Date: Sat, 27 Oct 2001 18:11:45 +0200
Message-ID: <yam...@sm...>
X-Mailer: YAM 2.3 [060] AmigaOS E-Mail Client (c) 1995-2000 by Marcel Beck  http://www.yam.ch/
Subject: MacsBug startup problem
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-2
Content-Transfer-Encoding: 8bit

Hi everybody,

I am working on an interesting startup problem with OS8.1 and Macsbug installed.

About every second time I have my machine turned on, MacOS won't start, instead I get a "unimplemented Trap" error.

So far I have been able to trace the problem back to a global variable at $bb8 about which I cannot find any further information. That variable seems to get initialized by ROM to $ffffffff. 
Somewhere later in the boot process, that variable is set to a valid address.

MacsBug checks some bits in a byte ($bb8) + $42 and, if non-zero, calls FSMgr trap, leading to the error described above.
As a workaround, I patched MacsBug to always return zero at the $bb8 check, and so far everything seems to work.

Does anybody know what that variable at $bb8 is about and why it isn't initialized properly ???


Regards,
Jürgen
-- 
Jürgen Lachmann jue...@t-... Blaubeuren Germany