设8359的两端口地址为60H，61H，使用三号中断源，IR3与SP相连。中断方式为边沿触发方式，每按一次AN按钮产生了一次中断信号，向8259A发出中断请求信号。如果中断源电平信号不符合规定要求则转到7号中断，显示“Err”。CPU响应中断后，在中断服务中，对中断次数进行计数并显示，计满5次结束，显示器显示“Good”。-established in 8359 to address two port 60H, 61H, use Route interrupt source, P value will cause connected with the SP. Interrupt trigger for 2500, every time the button AN produce a signal interruption. A 8259 issued to the interrupt request signal. If the interrupt source-level signals do not meet requirements on the 7th was interrupted to show that "Err." CPU interrupt response, after a break in service, the interruption frequency count and showed that the expiration of five times over, The display shows "Good."