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From: lagana@sparky.eecs.umich.edu (Antonio A Lagana)
Newsgroups: comp.sys.mac.programmer
Subject: Strange Address Problem on Plus but not on SE/30. WHY?
Message-ID: <1991Jun24.052855.29691@zip.eecs.umich.edu>
Date: 24 Jun 91 05:28:55 GMT
Sender: usenet@zip.eecs.umich.edu (Mr. News)
Distribution: usa
Organization: University of Michigan EECS Dept.
Lines: 19

Hi,

I have written an INIT that among other things does a head patch to some toolbox
routines.  I have tested it on my SE/30 and things seem to work fine with or
without other INITs loaded (under 7.0, by the way).  However, when I test it
on a Plus, with the same setup (with/without INITs, 7.0), the INIT causes the 
system to crash with an address error.  First of all, does anybody know what
exactly does an "address error" mean?  Is it something to do with the accessed
address not being aligned properly (I am not sure if the 68000 is word or byte
addressable)?  Or is it the result of trying to access a memory location which
does not exist?  Finally, are there any differences between the way that the
system works on an SE/30 versus the Plus, which could cause something to work
fine on the SE/30 but not on the Plus (I am not generating 68020/30 code BTW)?
Any help will be greatly appreciated.   

Thanks in advance,      

Antonio A. Lagana
lagana@sparky.eecs.umich.edu