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Article View: comp.sys.amiga.tech
Article #11555

Re: Longword alignment with 68020

#11555
From: Dave Haynie
Date: Wed, 22 Feb 1989 17:58
28 lines
1543 bytes
in article <27183@sgi.SGI.COM>, scotth@harlie.SGI.COM (Scott Henry) says:
> From article <6031@cbmvax.UUCP>, by daveh@cbmvax.UUCP (Dave Haynie):

>> ... but data doesn't have to be aligned at all.  

> Does this mean that the 68020 will work with byte-aligned word and longword
> data? 

Is there an echo in here?

> No more odd-address traps on data? :-)? Is this, then another potential 
> incompatibility with the 680?0 series?

You got it.  It's an Amiga operating system requirement that word or longword 
data be word aligned, and, in some cases, longword aligned.  It is not in any
way a requirement of the 68020 or 68030 hardware.  The reason for this is that
the 32 bit CPUs have a much more clever bus sizing mechanism than the 16 bit
ones.  The 68020/30 can do other strange things, like running code out of 8
bit memory, that the 68000/10 can't.  

>> Dave Haynie ...

>               Scott Henry <scotth@sgi.com>

-- 
Dave Haynie  "The 32 Bit Guy"     Commodore-Amiga  "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: D-DAVE H     BIX: hazy
              Amiga -- It's not just a job, it's an obsession
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Message-ID: <6046@cbmvax.UUCP>
Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ulowell!cbmvax!daveh
References: <27183@sgi.SGI.COM>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ulowell!cbmvax!daveh
From: daveh@cbmvax.UUCP (Dave Haynie)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Longword alignment with 68020
Message-ID: <6046@cbmvax.UUCP>
Date: 22 Feb 89 17:58:16 GMT
References: <27183@sgi.SGI.COM>
Distribution: na
Organization: Commodore Technology, West Chester, PA
Lines: 28