Re: system error $0027

[Rubywand <rubywand@swbell.net>]

David Empson writes ...
> 
> Rubywand <rubywand@swbell.net> wrote:
> 
> > David Empson writes ...
> > >
> > > Michael Wicklund <tbogard1@MYhome.com> wrote:
> > >
> > > > Supertimer:
> > > > "Can someone tell me what system error $0027 means?  Thanks."
> > > >
> > > > System Failure- File map destroyed
> > >
> > > Rubbish.
> >
> >      Alas, that is the description supplied in the Apple IIgs Toolbox
> > Reference Vol 2.
> 
> Ah, _that_ list.  I strongly suggest that any information derived from
> the "system failure codes" list in table B-1 in Toolbox Ref volume 2 be
> expunged from the FAQ.
> 
> These numbers are almost completely meaningless.  Some of them don't
> even make sense on a IIgs, and may have been copied from Macintosh
> documentation.
 ....

> 
> How about this for proof: Inside Macintosh, Volume III, page 176
> (summary of the System Error Handler, in a table entitled "User
> Alerts"):
> 
> Errors 1-3 and 5-14 have different meanings from the IIgs list, but the
> following are identical:
> 
> 4  Division by 0
> 
> Oh, this gets even better.  :-)
> 
> Error 15 in _decimal_ is "Segment loader error".
> Errors 16 through 24 (decimal) are "Can't load a package".
> Error 25 (decimal) is "Can't allocate requested memory block".
> Error 26 (decimal) is "Segment loader error".
> Error 27 (decimal) is "File map destroyed".
> Error 28 (decmial) is "Stack overflow".
> Error 30 (decimal) is "Please insert disk".
> Error 100 (decimal) is "Can't mount startup volume".
> 
> These correspond exactly to the values listed in the IIgs toolbox
> reference, except the IIgs values have been written as if they were hex
> values.

     Yes; they are shown as hex values, complete with "$" notation and being in
a list which includes error codes like "$001A". That the codes connected with
messages like "File map destroyed" have the same digits but are decimal in the
Mac list does look pretty bad.


> 
> Summary: most of the values in this table are copied verbatim
> (incorrectly) from Macintosh documentation, and I strongly suspect none
> of them have the slightest relevance to the IIgs.
> 
> The first few errors in the table (ProDOS-16 codes) may have some
> meaning, but in any case they would only apply to a screen which shows a
> "System failure" message, _not_ to error codes returned from OS calls.
>
> There is a similar mechanism in ProDOS-8, e.g. used to report a system
> failure due to an unclaimed interrupt.
> 
> Now, having said all that, the remaining sections of table B-1 are
> reasonably OK.  There are bound to be a few errors in there, but none as
> blatant as the so-called "system failure codes" list.
>
 ....

     Thanks for the explanation. The FAQs Error List has been updated to
include a snip from this message and the System Failure messages you mention
have been marked to indicate that their accuracy is suspect.



Rubywand