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How to access memory created using ds.l?

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romano13

Post subject: How to access memory created using ds.l?

Posted: Sun Apr 07, 2019 8:21 pm

Joined: Sun Apr 07, 2019 8:11 pm
Posts: 1

So i have this array which i intialiazed using ds.l

Code:

array1 ds.l 10

. I know i can access a the array by loading it and using it like:

Code:

lea array1, a0
move.l (a0)+,d1

but is there a way to access a specific number without looping through it? i tried do

Code:

move.l (a0,d1),d1

but that doesn't work. Is there a way to do that?

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profkelly

Post subject: Re: How to access memory created using ds.l?

Posted: Mon Apr 08, 2019 12:58 am

Joined: Thu Dec 16, 2004 6:42 pm
Posts: 1118

Code:

*-----------------------------------------------------------
* Program    : Array programming
* Written by : Charles Kelly
* Date       : April, 2019
* Description:
*-----------------------------------------------------------
    ORG $1000

START:              ; first instruction of program

    lea array1,A0       ; pointer to array
    clr.l   D2          ; index = 0
    move.l  #$42,(A0,D2)  ; store $42 to array at index D2
    
    *OR
    
    lea array2,A0       ; pointer to array
    move.l  #$65,(4,A0)  ; store $65 to array at array2 + 4
       
    MOVE.B  #9,D0
    TRAP    #15     ; halt simulator

* Variables and Strings
array1  ds.l    10  ; 10 long word array
array2  ds.l    10  ; 10 long word array

    END START       ; last line of source

_________________
Prof. Kelly

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