从并口输入数据： 外设检测STB是否忙，忙则等待。发数据，置ACK,检测AFD是否响应，是则清ACK否则等待。 PC检测ACK是否选通，是则置STB否则等待。读数据，处理后发AFD清忙。-input data from the parallel port : Peripherals detection STB whether busy, busy then wait. Fat, home ACK, testing whether AFD response, it is awaiting clea

一个RAS拨号程序高级开发，通过该程序能够实现电话拨号功能，能实现如adsl、网通等拨号功能，还能够监控modem或者网卡的网络流量-A RAS dial-up procedures for advanced development, can achieve through the program dial function, can achieve such as adsl, Netcom and other dial-up function, but also be able to moni