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 Printer Driver SWIs, used to well aid the use of the Parallel port for printing.
打印机驱动器s WI，用来辅助使用打印并行端口。
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。
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