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From: Petri Koistinen <pkoistin@hit.fi>
Newsgroups: comp.sys.m68k
Subject: Re: HELP!
Date: Thu, 26 Oct 2000 01:56:34 +0300
Organization: Helsinki Institute of Technology, Finland
Lines: 45
Message-ID: <Pine.SGI.4.10.10010260129500.8883-100000@maanantai.hit.fi>
References: <8t7k5f$2un$1@nnrp1.deja.com>
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In-Reply-To: <8t7k5f$2un$1@nnrp1.deja.com>

On Wed, 25 Oct 2000 jenmw1978@my-deja.com wrote:

> I have written the following code for the purpose of filling memory
> space from $4000 to $40FF with the number sequence from $0 to $FF...
> It does not seem to be working, if anyone could help me out as to what
> I am doing wrong I would greatly appreciate it...
> 
>     ORG $0
>     DC.L $8000
>     DC.L START
> 
>          ORG       $2000
> 
> START    LEA       $4000,A3
>          MOVE.L    #0,D1
> 
> LOOP     CMP.L     #$FF,D1
>          BGT       LOOP
> 
>          MOVE.B    D1,(A3)
>          ADD.B     #1,D1
>          ADDA.L    #1,A3
>          BRA       LOOP
> 
>          LEA       $4000,A3
>          BREAK

Loop testing is in wrong place, it should be at end (and some other
mistakes).
But how about change midle part to this:

START	LEA	$4100,A3
	MOVEQ	#-1,D1

LOOP	MOVE.B	D1,-(A3)
	DBEQ	D1, LOOP

	BREAK

It will fill $4000 to $40FF with $0 - $FF, but it will start filling for
end ($40FF) to beging ($4000).

Regards
Petri Koistinen