Article View: comp.sys.amiga.tech
Article #11293Re: Help writing a vblank server in assembly
From: Aaron Avery
Date: Wed, 01 Feb 1989 13:50
Date: Wed, 01 Feb 1989 13:50
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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! Especially note
>this, people writing in C.
Interesting. So, does this mean that just preserving a0 isn't sufficient?
That's what you imply, since you can't assume that a0 points to _custom on
entry.
--
Aaron Avery, ASDG Inc. "A mime is a terrible thing to waste."
-- Robin Williams
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cwjcc!hal!nic.MR.NET!umn-d-ub!uwvax!astroatc!nicmad!madnix!aaron From: aaron@madnix.UUCP (Aaron Avery) Newsgroups: comp.sys.amiga.tech Subject: Re: Help writing a vblank server in assembly Message-ID: <455@madnix.UUCP> Date: 1 Feb 89 13:50:06 GMT References: <3777@crash.cts.com> <5854@cbmvax.UUCP> Reply-To: aaron@madnix.UUCP (Aaron Avery) Organization: ASDG Incorporated Lines: 14