利用8255触发8259A的中断实验。8255的PC6作为8259A的中断源，8255每向8259A发出中断请求，都会造成LED指示等交替点亮和熄灭。-8255 8259A interrupt triggered by experiment. 8255 PC6 as the 8259A interrupt source, 8255 to 8259A for each interrupt request, will result in alternating directions, etc. LED lights on and off.