汇编程序46：实验13 编写、应用中断例程(1)

assume cs:code
;将数据段显示到屏幕上,安装程序
code segment
    start:
          mov ax,cs
          mov ds,ax
          mov si,offset sub1
          mov ax,0020h
          mov es,ax
          mov di,0
          mov bx,offset sub2 - offset sub1
          cld
          rep movsb
          mov ax,0
          mov es,ax
          mov word ptr es:[7ch*4],200h
          mov word ptr es:[7ch*4+2],0
          mov ah,4ch
          mov al,0
          int 21h
     sub1:
          push si
        s:
          cmp byte ptr ds:[si],0
          je s1
          inc si
          jmp short s
       s1:
2x           dec si
          mov byte ptr ds:[si],'$' ;'$'为显示字符串的结束标志
          pop si
3x           mov dx,0 ;dx为指向数据串的起始位置
          mov ah,9 ;第9号子程序
          int 21h
          iret
     sub2:
          nop
code ends

end start

 

assume cs:code
;测试程序
data segment
    db 'weclome to masm!','0'
data ends

code segment
    start:
          mov dh,10 ;行号
          mov dl,10 ;列号
          mov cl,2  ;颜色属性
          mov ax,data
          mov ds,ax
          mov si,0 ;指向数据段开始
          int 7ch ;显示的中断例程
          mov ax,4c00h
          int 21h
code ends

end start