详细介绍PS/2接口协议的内容、电气特性和标准键盘的第二套键盘扫描码集。给出了基于嵌入式系统的PS/2接口的软、硬件实现方法，并介绍了工控PC外接双键盘的解决方案。-Details PS/2 interface protocol content, electrical properties and the standard keyboard of the second set of keyboard scan code set. Give embedded systems based on th