sound.asm

不用借助其它的东西

cseg  segment  para  
      assume  cs:cseg
main  proc  far
      mov  ds,ax

  
   L1:   mov  al,0b6h     ;write timer mode reg
     out  43h,al
    
     mov  al,33h    
    
     out  42h,al      ;write timer2 count low byte
     mov al,05h
     out  42h,al      ;write timer2 count low byte
   in   al,61h
     xor   al,3
     out  61h,al
     mov cx,0ffh
L2:loop L2

  

jmp L1
 

      mov  ax,4c00h
      int  21h
     main  endp  

  
   

cseg  ends
end main