mouse(PS/2键盘鼠标) 4 x COM ports (3 x RS-232; 1 x RS-232/422/485)(4个COM接口) parallel printer port(打印机接口) 4 x USB 2.0(4个USB2.0接口) GPIO (8-bit TTL input and 8-bit TTL output)(通用输入/输出：8比特TTL输入/输出) Ex..
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Parallel port enables microcomputer users to connect to a parallel printer.
并行端日使微机用户能与并行打印机相连接。
The parallel port of computer is mainly used for connecting to printer, the data transmission rate is rapid because the data is transferred in parallel.
计算机并口主要用来连接打印机，由于数据并行传输，所以传输速度相对较快。
In addition, the USB family also includes USB printer, it is becoming more and more popular and presents the trend to replace the stylus printer and the parallel port printer.
此外，在US B家族中还包括USB接口的打印机，它越来越普及并且有取代针式打印机和并口打印机的趋势。
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