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用8255和8253編程,使揚聲器發(fā)出600HZ的可聽見頻率

提問者:網(wǎng)友 2018-07-17
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?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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