新建 文本文档 (3).txt

微机原理与接口。。华中科技大学。。版本。。PPT

code segment
     assume  cs:code
start:push ds
     sub ax,ax
     push ax 
     mov   al,01010110b
     mov   dx,307h
     out   dx,al
     mov   al,73d
     mov   dx,305h
     out   dx,al


     mov   al,10010110b
     mov   dx,307h
     out     dx,al
     mov   al,0h
     mov   dx,306h
     out    dx,al
     mov  ah,4ch
     int 21h
code ends
end start