单步显示字符，编译运行就不显示，原因？
单步显示字符，编译运行就不显示，我是vista系统codesg segment
start:
mov ax,0b800h
mov ds,ax
mov byte ptr ds:[0],41h
mov byte ptr ds:[1],0cah
mov ax,4c00h
int 21h
codesg ends
end start
codesg segment
start:
mov ax,0b800h
mov ds,ax
mov byte ptr ds:[0],41h
mov byte ptr ds:[1],0cah
mov ax,4c00h
int 21h
codesg ends
end start
