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本文介绍了我们设计开发的ＤＯＳ／ＵＮＩＸ环境下带ＭＯＤＥＭ控制的串行口驱动程序、驱动程序之上的Ｘ．２８通信平台以及平台的应用。ＤＯＳ下的底层驱动程序用驻留中断实现，ＵＮＩＸ下的驱动程序用ＵＮＩＸ的流机制实现，数据接收均采用硬件中断，有效地防止了漏字符现象的发生。ＤＯＳ、ＵＮＩＸ下串行口驱动程序之上的Ｘ．２８通行平台提供了一致的可用于二次开发的编程原语。利用该平台可以实现ＤＯＳ／ＵＮＩＸ应用程序通过Ｘ．２５公共数据网或公共电话网的数据传输。本文还介绍了我们在平台上开发的Ｘ．２５ＰＤＮ上ＳｐｒｉｎｔＭａｉｌ用户端应用程序。
This article describes the design and development of DOS / UNIX environment with MODEM control serial port driver, the driver above the X. 28 communication platform and platform applications. Under the DOS driver with a resident interrupt to achieve the UNIX driver using UNIX flow mechanism to achieve, the data received by the hardware interrupt, effectively preventing the occurrence of missed characters. DOS, UNIX under the serial port driver on the X. 28 Pass platform provides a consistent programming primitive that can be used for secondary development. The use of the platform can achieve DOS / UNIX applications through the X. 25 Public data network or public switched telephone network data transmission. This article also describes the X we developed on the platform. SprintMail client application on 25PDN.