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Assembly Language : Where is the answer stored?

 
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Assembly Language : Where is the answer stored?, Ultimate Noob to Assembly
nomad1987
post 4 Jun, 2008 - 11:15 PM
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Well i admit i am certain that i am most definitely a noob to assembly language. Anyways i have a few small questions:

first question is like this. Where is the actual answer stored

CODE

start     org         $1000
           move.l     #$7ffe,sp         ;
           move.l     #data,a1         ;
           move.b    #3,d2             ;

loop     add.b      (a1)+,d1          ;
           sub.b       #1,d2             ;
           bne         loop              ;
           move.b   d1,(a1)           ;
           move.b   #228,d7          ;
           trap        #14

           org         $2000    
data     dc.b        5                  
           dc.b        7                  
           dc.b        9
           ds.b        1                 ;space for result
           end

now i'm thinking that the answer is 21 and overwrites the actual value of 9, however i only come to this conclusion because isn't it so that ds.b just means to reserve space in a1 for the answer, not actually be called upon.

** Edit ** code.gif
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no2pencil
post 4 Jun, 2008 - 11:18 PM
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I thought the data segment always went at the top. Not like a "should" but a as a rule.

Which assembler language is this?
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NickDMax
post 7 Jun, 2008 - 04:23 PM
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2B||!2B

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you can put the data anywhere you want it! Back in my days of writing TSR's I actually put the data into the code segment so that it could all fit into one littl package. So my first command of the program would be a jump to "jump over" all the data... well... I remember the first command was a jump, but I am not SURE it was for the data... I do seem to remember the data at the end of the program. I will have to look into that.
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