Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!uwvax!umn-d-ub!cs.umn.edu!nis!wd0gol!newave!john
From: john@newave.UUCP (John A. Weeks III)
Newsgroups: comp.sys.mac
Subject: Re: Mac Plus/SE compatibility
Summary: Sort of ...
Message-ID: <41@newave.UUCP>
Date: 13 Feb 90 05:05:23 GMT
References: <2731@swi.swi.psy.uva.nl>
Reply-To: john@newave.mn.org (John A. Weeks III)
Organization: NeWave Communications Ltd, Eden Prairie, MN
Lines: 26

In article <2731@swi.swi.psy.uva.nl> winkels@swi.psy.uva.nl (Radboud Winkels):
> I have a short question: Isn't the Mac SE (FD/HD) supposed
> to be upward compatible with an Mac Plus (ED)?

The Mac Plus and SE have different ROM chips.  The Mac Plus has 128K ROMs,
and the SE has 256K ROMs.  Any bugs introduced in the new ROMs, or bugs
fixed in the new ROMs, may cause programs to act differently.

There are a few cases of software that works on the Plus and not on the
SE.  I have an init called "Big Screen" (sort of like Stepping Out, but
much older) that runs on my Plus, but bombs out on an SE.  From my
experience, this is was quite rare--most everything that will run on a Plus
will work on an SE.

The version of your system software has a much greater impact on what
runs and what doesn't run.  If you find programs that don't run, try 
using different and/or older versions of the system software.  This
sometimes makes a difference.

-john-

-- 
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John A. Weeks III   (612) 942-6969   ...uunet!rosevax!bungia!wd0gol!newave!john
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