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From: hyc@umix.cc.umich.edu (Howard Chu)
Newsgroups: comp.sys.atari.8bit
Subject: Re: What's the right way...
Message-ID: <2266@umix.cc.umich.edu>
Date: Fri, 9-Oct-87 01:22:47 EDT
Article-I.D.: umix.2266
Posted: Fri Oct  9 01:22:47 1987
Date-Received: Mon, 12-Oct-87 06:08:06 EDT
References: <871006122252.4.JRD@GRACKLE.SCRC.Symbolics.COM>
Reply-To: hyc@umix.cc.umich.edu (Howard Chu)
Organization: University of Michigan Computing Center, Ann Arbor
Lines: 12
Summary: returning to DOS?
UUCP-Path: {uunet,rutgers}!umix!hyc


Are you using Action? Action writes object files based off the Init
vector. Unfortunately, it also provides a valid address for the Run vector.
What happens is that an Action program will load, execute, and then DOS
will try to execute it again based on the Run vector. (The two addresses
here aren't identical - the Init vector points to some runtime startup
code, whereas the Run vector points to the actual beginning of the program.)
The solution is simple - Define a global variable at the beginning of
your program, and pre-initialize it to the value $60. As long as the first
byte of your program is an RTS, things should work fine...
-- 
  -- Howard Chu
	"Of *course* it's portable. It's written in C, isn't it?"