Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!CORY.BERKELEY.EDU!dillon
From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: Re: More help with messages/handlers
Message-ID: <8804252056.AA01546@cory.Berkeley.EDU>
Date: 25 Apr 88 20:56:05 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
Lines: 19

>on an old source disk), I still can't get a handler to work correctly.  I

	Watch out for the following:

	(1) The handler MUST save any registers it uses (except A0,A1,D0,D1,
	    which are scratch).  The handler is called with the event in
	    A0 and your data segment in A1.  The handler must return the
	    new event list in D0.

	(2) If using the small data model, you MUST load the proper address
	    register with the proper value pointing to the programs data
	    space to be able to use any external variables, including making
	    any library call.

	(3) A pointer to an interrupt structure containing the function
	    and data segment (I usually don't use the data segment part)
	    is passed when adding the handler.

	Try this:	Have your handler simply RTS... see if the system
			crashes