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- .将单脉冲作为中断源输入给8259A的IR0,按一次脉冲使8259A产生一次中断,中断服务计数中断次数,并可通过8255的PA口输出至L7 L0显示-. The single pulse as the input to the 8259A interrupt source of the IR0, according to a pulse to generate an 8259A interrupt, the interrupt service counting interrupti