Re: A89: dumb question

To: assembly-89@lists.ticalc.org
Subject: Re: A89: dumb question
From: Olle Hedman <oh@hem.passagen.se>
Date: Sat, 19 Jun 1999 11:20:04 +0200
Delivered-To: assembly-89-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-89@lists.ticalc.org
References: <ac6edda5.249c4c08@aol.com>
Reply-To: assembly-89@lists.ticalc.org

S43R80@aol.com wrote:
> 
> In a message dated 99-06-18 20:50:41 EDT, you write:
> 
> > Assuming, that 'whatever' happens to be on an even address, otherwise
> >  a surprise package with big red 'address error exception' stamped
> >  all over it will arrive in an instant ...
> >
> >  Zoltan
> >
> i don't think "clr.x" has anything to do with even/odd addresses at all...if
> i'm not mistaken i believe you are mistaken...
> i think but am not sure that the only time you have to worry about odd
> address is if you may be writing to one...then you will get that big red
> error you were refering to =)

no, he is right! first, clr do write to memory (how else would it clear it?) and
second, it applies to reads too..
all instuctions that work with w or l requiers even addresses..

but, if you just write one dc.b in your code, the assembler will automagically
align it.
BUT if you though write like this:

foo	dc.b  xx
whatev	dc.b  yy
bar	dc.b  zz

and tried to clr.w whatev, then you would get an address error...

//Olle

References:

Re: A89: dumb question

From: S43R80@aol.com