王爽汇编第三版实验10

 1 assume cs:code
 2 
 3 data segment
 4     db ‘Welcome to masm!‘,0
 5 data ends
 6 
 7 stack segment
 8     db 16 dup (0)
 9 stack ends
10 
11 code segment
12     start:
13         mov dh,8
14         mov dl,3
15         mov cl,2
16         mov ax,data
17         mov ds,ax
18         mov si,0
19         call show_str
20     
21     ;一直循环
22     all:
23         jmp short all
24         
25         mov ax,4c00h
26         int 21h
27     
28     show_str:
29         mov bl,1
30         mov al,dh
31         sub al,bl 
32         ;（n行-1）*160=n行开头的偏移地址
33         mov bl,160
34         mul bl
35         mov bx,0b800h
36         mov es,bx ;显存的段地址放在es
37         mov bx,ax  ;行
38         mov dh,0
39         ; （n列-1）*2=当前列的偏移地址
40         mov di,dx 
41         sub di,1
42         add di,di
43         ;颜色设置
44         mov ch,0
45         mov dx,cx
46     s:
47         mov cl,[si]
48         mov ch,0
49         jcxz ok
50         mov ax,[si]
51         mov es:[bx+di],ax
52         mov es:[bx+di+1],dx
53         ;一个字母占两个字节，一个ascii
54         add di,2
55         inc si
56         loop s
57         
58     ok:    
59         ret
60         
61 code ends
62 end start