1、　　设计一个电路，由8086通过8255A读取四个开关的状态，然后通过查表输出结果由LED七段数码管显示相应的数字。例如：当四个开关全部断开，读取的数据为1111，则数码管显示F。画出电路图、按要求编写程序，在仿真环境下调试通过。-a circuit design　8086 through 8255A Reads four switch status, and then display the corresponding number　the LED seven-segment LED output by the look-up table. For example: When the four switches are all turned off, the data read is 1111, the digital display F. Draw the circuit, according to the requirements of programming, under simulation debugging environment.