汇编程序43：实验12 编写0号中断的处理程序 

 1 assume cs:code
 2 //把中断处理程序导入0020:0处,用另一程序测试
 3 code segment
 4     start:
 5           mov ax,cs
 6           mov ds,ax
 7           mov si,offset do0
 8           mov ax,0
 9           mov es,ax
10           mov di,200h
11           mov cx,offset do0end - offset do0
12           cld
13           rep movsb
14           mov ax,0
15           mov es,ax
16           mov word ptr es:[0*4],200h
17           mov word ptr es:[0*4+2],0
18           mov ax,4c00h
19           int 21h
20       do0:
21           jmp short do0start
22           db 'overflow!'
23  do0start:
24           mov ax,cs
25           mov ds,ax
26           mov si,202h
27           mov ax,0b800h
28           mov es,ax
29           mov di,12*160 + 36*2
30           mov cx,9
31         s:
32           mov al,[si]
33           mov es:[di],al
34           inc si
35           add di,2
36           loop s
37           mov ax,4c00h
38           int 21h
39    do0end:
40           nop
41 code ends
42 
43 end start

 

 1 assume cs:code
 2 //测试程序,可显示
 3 code segment
 4     start:
 5           mov ax,1000h
 6           mov bl,1
 7           div bl
 8           mov ax,4c00h
 9           int 21h
10 code ends
11 
12 end start

 

posted on 2018-02-03 17:01  叶倾仙  阅读(266)  评论(0)    收藏  举报

导航