汇编实验13(1)

eol75999

1. ;(1)
   
2. assume cs:code
   
3. code segment
   
4. start:
   
5. push ax
   
6. mov ax,cs
   
7. mov ds,ax
   
8. pop ax
   
9. mov si,offset s0
   
10. mov ax,0         
    
11. mov es,ax       
    
12. mov di,200h
    
13. mov cx,offset s2-offset s0
    
14. cld
    
15. rep movsb
    
16. mov word ptr es:[7ch*4],200h
    
17. mov word ptr es:[7ch*4+2],0
    
18. mov ax,4c00h
    
19. int 21h
    
20. s0:
    
21. mov ax,0b800h
    
22. mov es,ax
    
23. mov ax,160
    
24. mul dh
    
25. mov di,ax
    
26. mov ax,2
    
27. mul dl
    
28. add di,ax
    
29. mov al,cl
    
30. mov si,0
    
31. s1:
    
32. cmp byte ptr ds:[si],0
    
33. je sssss
    
34. mov ah,[si]
    
35. mov byte ptr es:[di],ah
    
36. mov byte ptr es:[di+1],al
    
37. 
    
38. add di,2
    
39. inc si
    
40. jmp s1
    
41. sssss:
    
42. iret
    
43. s2:
    
44. nop
    
45. code ends
    
46. end start

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