同时在该设计里还进行了扩展，加入了一块单片机，一个串行接口，一个USB接口。

At the same time I also expanded in this design, joined an one-chip computer, a serial interface, a USB interface.

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最显著的一个问题就是，清单6中的接口在设置或检索每个位，以及从串行端口读取字节或者向串行端口写入字节都需要一个JNI调用。

The most obvious issue is that the interface in Listing 6 requires a JNI call for each bit set or retrieved, as well as a JNI call to read a byte from, or write a byte to, the serial port.

youdao

标准功能，如第2，串行接口，一个并行接口，软盘驱动器和CD ROM驱动器提供。

Standard features such as 2 serial ports, one parallel port, a diskette drive and a CD ROM drive are provided.

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