The single-chip MODEM majors in MCU control system. This paper introduced the fundamentals of the chip, the interface circuit linking 73K222AL and AT89C51, and its programs.

文章分析了它的主要特性，同时给出了73K222AL与单片机AT89C51的接口电路和应用程序设计。

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In the remote, the microcontroller through RS232 serial interface controls MODEM, and the local main computer is made up of system computer and MODEM.

远端由单片机通过RS232串行口控制调制解调器，本地主机由系统机和调制解调器组组成。

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Interface circuit and the design of control program in asynchronous transfer mode between AT89C51 single chip microcomputer system and intelligent MODEM are introduced.

介绍AT 89 C 51单片机系统与智能调制解调器MODEM之间的接口电路和异步传输方式下的控制程序设计。

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Modem and network interface are included, too, along with a really noisy cooling fan.

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Additionally, there is a 56Kbps V.90 modem, a Sony iLINK interface, USB ports and a pair of speakers.

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