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本文所述的通信软件CRST能实现PC机之间的高速数据传送,传送速率可达19.2Kb/s,软件使用方阵码检错,具有自动重发功能。通信软件编制为驻留内存(TSR)形式,通信功能在一方启动后进入脱机服务状态,即在通信启动后双方都可进行独立的前台操作,通信程序的运行环境异常复杂,本文详细论述了通信进程与DOS操作系统及双方前台进程的协调共存问题。一、程序的功能设计 IBM-PC及其兼容机具有1到2个串行口,在DOS操作系统下利用输入输出的重定向也可实现文件的传输,但这既无校验与纠错功能,通信控制又极其原始,对于远程通信根本不能奏效。另外,目前在DOS操作系统下现成的通信软件有XCOM,COM等,它们
The communication software CRST described in this article can achieve high-speed data transfer between PC, the transfer rate up to 19.2Kb / s, the software uses the square code error detection, with automatic retransmission function. The communication software is compiled into TSR form. The communication function enters the off-line service state after one party starts up. That is, both parties can perform independent foreground operations after the communication is started. The operation environment of the communication program is extremely complicated. This article discusses in detail Communication process and DOS operating system and both sides of the process of co-existence of the foreground coexistence issues. First, the functional design of the program IBM-PC and its compatible machine has 1-2 serial ports, the use of input and output redirection in the DOS operating system can also achieve file transfer, but there is no check and error correction function , Communication control is extremely primitive, for remote communication simply can not work. In addition, currently under the DOS operating system ready communications software XCOM, COM, etc., they