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From: cck@cunixc.UUCP
Newsgroups: comp.sys.mac
Subject: Re: Lisa Pascal Compatibility?
Message-ID: <122@cunixc.columbia.edu>
Date: Thu, 17-Sep-87 10:07:39 EDT
Article-I.D.: cunixc.122
Posted: Thu Sep 17 10:07:39 1987
Date-Received: Sat, 19-Sep-87 08:52:29 EDT
References: <791@uhccux.UUCP>
Reply-To: cck@cunixc.columbia.edu (Charlie C. Kim)
Organization: Columbia University Center for Computing Activities
Lines: 34
Keywords: Lisa Pascal, MPW Pascal, LS Pascal

If you have assembler code, then if it must be non-a5 relative (e.g.
interrupt level routine), you must be careful about the way you define
it.  In particular, the standard coding methodology is something like:

	procn	proc	export
		data
		<data decl>
		code
		endp
but this ends up with a5 relative code.

recoding this as:
	someprocset	proc	export
		<data decl>
	procn:	<procedure code>
		endp
		
will give you non-a5 relative code.


Other than this, the problems with Band, etc (which as I remember,
actually only occurs with one release of MPW (1.0.2?)), different
include file locations, and non-truncated identifier names, I think
you'll find things pretty easy.

I've ported a 10K line program from Lisa Pascal to MPW in a couple of
days - the only major problem was because of the a5 relative
addressing in the assembler (it was ddp listener code that should not
have been a5 relative - this took a week to figure out - mostly
because I assumed that MPW did the right thing :-).

Charlie C. Kim
User Services
Columbia University