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From: bbaker@cbmvax.commodore.com (Bob Baker)
Newsgroups: comp.sys.amiga
Subject: Re: An Assembler question
Message-ID: <16176@cbmvax.commodore.com>
Date: 30 Nov 90 16:09:45 GMT
References: <3534@orbit.cts.com>
Reply-To: bbaker@cbmvax.commodore.com (Bob Baker)
Organization: Commodore, West Chester, PA
Lines: 37

In article <3534@orbit.cts.com> koleman@pnet51.orb.mn.org (Kurt Koller) writes:
> Ok, I have the following line:
>  
> ;       move.b  mt_data+$3b7,mt_songpos
>  
>  
> And I want to make it a "good, pc-realative" set of instructions.  This didn't
> work:
> 
>         movem.l  a5-a6,-(a7)
>         move.l  mt_data(pc),a4

          ^^^^^^  change this to lea

>         lea     mt_songpos(pc),a5
>         move.b  -$3b7(a4),(a5)
                  ^--- remove this negative sign

>         movem.l  (a7)+,a5-a6
> 

The above changes should fix your problem. You were taking the contents of
the location mt_data and using it as the address in A4 instead of loading
the address of mt_data into a4 as needed for the following move.b

	Bob

> 
> Also, I tried adding $3b7 to a4, and doing a    move.b (a4),(a5)    and got
> absolutely nowhere...
>  
> Thanks.
>  
>  
> (Maybe I should buy a book on assembly?  Everything so far has been
> guesswork.)
> Kurt "Koleman" Koller - tcnet!orbit!pnet51!koleman