help with some homework plz!

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help with some homework plz!

 
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  #1
Sep 10th, 2009
hi all i have some homework that i cant finish cuz i dont know how to print it the way my teacher wants it.. here's the thing

*Print this in debugger
Assembly Syntax (Toggle Plain Text) 
  1.                                                                                                    hello
  2.                                                                                                            .
  3.                                                                                                            .
  4.                                                                                                            .
  5.                                                                                                   25 times
in the right of the screen.... this is what i have so far

Assembly Syntax (Toggle Plain Text) 
  1. Microsoft Windows [Versión 6.0.6002]
  2. Copyright (c) 2006 Microsoft Corporation.  Reservados todos los derechos.
  3.  
  4. C:\Users\MAURO>cd workspace
  5.  
  6. C:\Users\MAURO\workspace>debug prue.com
  7. -u100
  8. 1841:0100 BA2006        MOV     DX,0620
  9. 1841:0103 B402          MOV     AH,02
  10. 1841:0105 CD10          INT     10
  11. 1841:0107 B80002        MOV     AX,0200
  12. 1841:010A 48            DEC     AX
  13. 1841:010B 4F            DEC     DI
  14. 1841:010C 4C            DEC     SP
  15. 1841:010D 41            INC     CX
  16. 1841:010E 0D0A24        OR      AX,240A
  17. 1841:0111 B409          MOV     AH,09
  18. 1841:0113 BA0A01        MOV     DX,010A
  19. 1841:0116 B91900        MOV     CX,0019
  20. 1841:0119 CD21          INT     21
  21. 1841:011B E2FC          LOOP    0119
  22. 1841:011D CD20          INT     20
  23. 1841:011F 0000
at 010a (12 row) its my chain HOLA
e10a 'hola',0d,oa,'$'

i'm using Windows vista HP and a intel core2 procesor


i dunno how to put the rest of the chains in the same position as the first one... i thought about an increment or printing the interruption with the chain.. plz help i dunno what to do.
and excuse my english i'm not a native english speaker i'm mexican
Last edited by xenocide001; Sep 10th, 2009 at 6:58 pm.
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Re: help with some homework plz!

 
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  #2
Sep 11th, 2009
You need to keep the ASCII text ouside the code flow or it will be treated like code, which it isn't!

You need to modify your code as to something as follows!

Asm Syntax (Toggle Plain Text) 
  1. 	MOV	AH,9		; Write String to STDOUT
  2. 	mov	DX,Hola
  3. 	mov	CX,25
  4.  
  5. prt:	int	21h		; DOS -Interrupt
  6. 	loop prt
  7.  
  8. 	int	20h
  9.  
  10. Hola:	db	'hola',0dh,0ah,'$'
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Re: help with some homework plz!

 
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  #3
Sep 11th, 2009
well thnx for the answer but i can't put the string in the dx i tried ur code and pops and error at
Assembly Syntax (Toggle Plain Text) 
  1. mov dx,hola
the error is in the string..
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Re: help with some homework plz!

 
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Sep 11th, 2009
then try offset Hola

or use LEA or something similar!

The idea is the data has to not be in the code flow, and you need to load its address into ds:dx.

Watch the spelling!
Are you doing this in the debugger or an assembler?

If the debugger then you need to mov dx, ####
where #### is the hard coded address of the string!
Last edited by wildgoose; Sep 11th, 2009 at 9:34 pm.
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Re: help with some homework plz!

 
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  #5
Sep 12th, 2009
in ms-dos debugger .. and i think i get it.. save the string and cal its addres in dx right?..
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Re: help with some homework plz!

 
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  #6
Sep 12th, 2009
I'm not sure why you aren't using one of the many free assemblers available instead of the ancient 1980 DOS debugger but yes. You'll have to enter your code instructions, then in adjacent memory (or following the code) store the data and set the DX register to point at that string data in memory!
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Re: help with some homework plz!

 
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  #7
Sep 12th, 2009
lol ty man u helped me a lot.. and i'm using the old debugger cuz the teacher said we'll be using that until we move to *nix based systems
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