The article introduced the characteristics of Enhanced Parallel Port of the computer and gave a design of the hardware encrypt card based on EPP.

介绍了计算机增强型并行口epp协议的基本特点，给出了基于EPP协议的硬件加密卡的一种设计方案。

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In addition, the communication with MCU and computer is realized by the serial communication port. The system's hardware schematics and software flow chart are also discussed in this paper.

此外，还利用单片机的串行通信模块，设计了与计算机通信的串行接口，并给出了系统的硬件电路图和软件流程图。

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At last it discusses the principle of AE source location and constructs the hardware structure of locating via multi-passages switch and parallel port of computer.

最后讲解了声发射源定位的原理和通过多路开关、计算机并行口构建多通道源定位系统的硬件结构。

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