The location of chip on the simple board,and the direction of switching board. ![](https://box.kancloud.cn/d3179b65ebf419dc357f1fc43e3b536b_249x375.png) Reading ![](https://box.kancloud.cn/560e6f67a9aa7b17159d39b320715edb_458x154.png) Writing ![](https://box.kancloud.cn/93a162ab12ec9c9a3521cda35a87df55_437x200.png)