单脉冲作为中断源输入给8259A的IR0 将，按一次脉冲使8259A产生一次中断，中断服务计数中断次

Title: 单脉冲作为中断源输入给8259A的IR0

Description: 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，通过8255输出中断次数至L7~L0显示

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