Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!apple!well!ewhac
From: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Help writing a vblank server in assembly
Message-ID: <10569@well.UUCP>
Date: 2 Feb 89 08:46:57 GMT
References: <3777@crash.cts.com> <5854@cbmvax.UUCP>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Organization: Boing Boom Tschak
Lines: 15
Quote: "I feel like such an idiot."  -- Riker
	"Quite right.  So you should."  -- Picard

In article <5854@cbmvax.UUCP> jesup@cbmvax.UUCP (Randell Jesup) writes:
>	Oh, when writing vblank routines, currently you must not assume the
>value of a0 on entry, but MUST set a0 == _custom on exit!
>				^^^^^^^^^^^^^^^^^^^^^^^^^
	When did this become true?  Is this required for handlers, servers,
or both?

	I have a VBlank server in "Onion" that sets D0 to 0 on exit, and it's
worked great (so far).

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
Leo L. Schwab -- The Guy in The Cape	INET: well!ewhac@ucbvax.Berkeley.EDU
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