汇编程序51：检测点15.1(2) 

 1 assume cs:code
 2 ;安装程序,接受按键事件,变化颜色
 3 code segment
 4     start:
 5           mov ax,cs 
 6           mov ds,ax
 7           mov si,offset sub1
 8           mov ax,0020h
 9           mov es,ax
10           mov di,0
11           mov cx,offset sub2 - offset sub1
12           cld 
13           rep movsb ;复制程序
14 
15           mov ax,0
16           mov es,ax
17           mov word ptr es:[7ch*4],200h
18           mov word ptr es:[7ch*4+2],0
19           mov ax,4c00h
20           int 21h ;入口地址附加
21      sub1:
22           push ax
23           push bx
24           push es
25 
26           in al,60h
27 
28           pushf
29           call dword ptr ds:[0]
30           cmp al,1
31           jne int9ret
32           mov ax,0b800h
33           mov es,ax
34           inc byte ptr es:[12*160+40*2+1]
35 
36   int9ret:
37           pop es
38           pop bx
39           pop ax
40           iret
41      sub2:
42           nop
43 code ends
44 
45 end start

 

 1 assume cs:code
 2 ;测试程序
 3 stack segment
 4     db 128 dup(0)
 5 stack ends
 6 
 7 data segment
 8     dw 0,0
 9 data ends
10 
11 code segment
12     start:
13           mov ax,stack
14           mov ss,ax
15           mov sp,128
16 
17           mov ax,data
18           mov ds,ax
19 
20           mov ax,0
21           mov es,ax
22 
23           push es:[9*4]
24           pop ds:[0]
25           push es:[9*4+2]
26           pop ds:[2]
27 
2x           cli ;设置IF为0,禁止可屏蔽中断执行,这里指键盘中断
28           mov word ptr es:[9*4],200h
29           mov word ptr es:[9*4+2],0
2x           sti ;设置IF为1,允许可屏蔽中断执行,这里指键盘中断
30 
31           mov ax,0b800h
32           mov es,ax
33           mov ah,'a'
34         s:
35           mov es:[12*160+40*2],ah
36           call delay
37           inc ah
38           cmp ah,'z'
39           jna s
40 
41           mov ax,0
42           mov es,ax
43 
44           push ds:[0]
45           pop es:[9*4]
46           push ds:[2]
47           pop es:[9*4+2]
48 
49           mov ax,4c00h
50           int 21h
51 
52      delay:
53            push ax
54            push dx
55            mov dx,10h
56            mov ax,0
57         s1:
58            sub ax,1
59            sbb dx,0
60            cmp ax,0
61            jne s1
62            cmp dx,0
63            jne s1
64            pop dx
65            pop ax
66            ret
67            int 7ch
68 
69 code ends
70 
71 end start

 

posted on 2018-02-04 20:20  叶倾仙  阅读(274)  评论(0)    收藏  举报

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