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用8255和8253編程,使揚(yáng)聲器發(fā)出600HZ的可聽(tīng)見(jiàn)頻率

問(wèn) 提問(wèn)者:網(wǎng)友 2018-07-17
最佳回答
?CODE??? SEGMENT ??????? ASSUME CS:CODE START:? ??????? IN??? AL, 61H ??????? OR?? AL, 03H ??????? OUT 61H, AL ?????? MOV AL, B6H ??????? OUT 43H, AL ??????? MOV AX, 1983 ??????? OUT 42H, AL ??????? MOV AL, AH ??????? OUT 42, AL ??????? MOV AH, 01H ??????? INT? 21H ??????? IN Al, 61H ??????? AND AL, 0FCH ??????? OUT? 61H, AL ??????? MOV AH, 4CH ??????? INT? 21H CODE??? ENDS ??????? END???? START
回答者:網(wǎng)友
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