汇编语言 实验12

 1 assume cs:code
 2
 3 code segment
 4 start:
 5         mov ax,code
 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
15         mov ax,0
16         mov ds,ax
17         mov word ptr ds:[0],200h
18         mov word ptr ds:[2],0
19
20         mov ax,4c00h
21         int 21h
22
23    do0:
24         jmp short do0start
25    do0str:
26         dw 1
27         db ‘divide error! ‘
28    do0start:
29         mov ax,cs
30         mov ds,ax
31         mov si,202h
32
33         mov ax,0b800h
34         mov es,ax
35         mov di,7c8h
36         mov cx,14
37     ;    mov cx,ds:[202h]
38    s:
39         mov al,ds:[si+2]
40         mov es:[di],al
41         inc si
42         add di,2
43         loop s
44
45         mov ax,4c00h
46         int 21h
47
48         mov ax,ds:[202h]
49         inc ax
50         mov ds:[202h],ax
51
52         push cx
53         mov cx,5
54      ds0:
55         push cx
56         mov cx,0ffffh
57      ds1:
58         loop ds1
59         pop cx
60         loop ds0
61         pop cx
62
63         iret
64
65    do0end:
66         nop
67
68 code ends
69 end start

shiyan12.asm

 1 assume cs:code
 2
 3 code segment
 4 start:
 5         mov ax,0
 6         mov bx,0
 7         div bx
 8
 9         mov ax,4c00h
10         int 21h
11
12 code ends
13 end start

12fushu.asm