Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!asuvax!stjhmc!p12.f56.n114.z1.fidonet.org!Chris.Gehlker
From: Chris.Gehlker@p12.f56.n114.z1.fidonet.org (Chris Gehlker)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Help: return to Finder with programmer's switch?
Message-ID: <30419.27493A91@stjhmc.fidonet.org>
Date: 20 Nov 90 14:14:43 GMT
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> Can anyone comment on the safeness of using address 0 as scratch space? 
> I've done this for a while--another alternative is to write into the
> screen buffer if you're on a + or SE, but the address is longer and
> harder to type.  Is there anything important there that's being
> overwritten?  I don't think I've had any problems with doing this, so
> I'd guess there's not, but that's just a guess.

It's fine on a Mac. Don't try it on an Amiga. Note that TMON puts
NIL! into address 0 as a debugging aid. The idea was that attempting
to reference an unitialized pointer would generate an immediate
address error since '!' is odd and that the 'NIL!' would give a
hint to the programmer.

 

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