这是我们学习汇编的时候的代码，仅供学习参考。
源代码：
data segment
string db 'Hello',13,10,'$' ；字符串以’$’符号结尾，以单引号括起来
data ends
code segment
assume cs:code,ds:data
start: ；程序的入口地址
push ds ；save old data segment
sub ax,ax ；ax寄存器清零，作为数据段0偏移地址
push ax ；零偏移地址入栈
mov ax,data
mov ds,ax ；把数据段地址装入数据段寄存器ds
lea dx,string ；把字符串首地址装入dx寄存器，或写成mov dx, offset string
mov ah,9 ；DOS功能调用，在屏幕上显示字符串
int 21h ；DOS中断
mov ah,4ch ；return to DOS
int 21h
code ends
end start ；汇编的结束，程序在此执行
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