例: Sound程序3 speaker _on proc push ax call speaker_on 1 al. 61h or 1,3 mov al. 255 out 61h. al out 42h. al pop ax mov CX, 500 ret 2: push CX speaker_on endp mov Cx. 0do00h L2a. speaker_off proc loop L2a push ax pop CX 1.61h loop L2 and al. ofch sub al 1 out 61h. al Jnz pop ax ret call speaker_off speaker_off endp6 …… call speaker_on mov al, 255 L 1 : out 42 h , al mov cx, 500 L 2 : push cx mov cx, 0 d000 h L 2 a : loop L 2 a pop cx loop L 2 sub al, 1 jnz L 1 call speaker_off …… speaker_on proc push ax in al, 61 h or al, 3 out 61h, al pop ax ret speaker_on endp speaker_off proc push ax in al, 61 h and al, 0fch out 61h, al pop ax ret speaker_off endp …… 例：Sound 程序 3