用8255并行接口控制一个16键的小键盘（用行扫描法或反转法均可），按图连接线路：

1>、用导线将PA0—PA7连接到插孔RL0—RL7，控制键盘行数据。

2>、用导线将PB0、PB1连接到插孔Y0、Y1，控制键盘列数据。拔掉K10上的所有短路套。

3>、片选CS连接218H—21FH。 -8255 parallel interface used to control a 16-key keypad (with line scanning method or inversion method can be), in accordance with plans to connect line: 1> with wire will be connected to the PA0-PA7 jack RL0-RL7, control of the keyboard row data . 2>, using wire to PB0, PB1 jack connected to the Y0, Y1, control the keyboard data. K10 pulled out all the short-circuit sets. 3>, Chip Select CS connection 218H-21FH.