本文介绍作者研制的通用四值逻辑模拟系统LSDS.该系统采用动态数据结构,可充分利用计算机内存空间,因而可在微机上模拟较大规模的数字电路。该系统对各逻(?)模块的时间参数考虑精细,可对数字系统的时序关系进行精确模拟.被模拟的电路的硬件描述简单,直观易懂,编写简便,并可由用户自行定义功能块电路,因而具有较强的模拟功能和使用价值。该系统用pascal 语言编写,通用性强,便于移植. This article introduces the LSDS, a general-purpose four-valued logic simulation system developed by the author, which uses a dynamic data structure to make full use of computer memory space, so that a large-scale digital circuit can be simulated on a microcomputer. The system considers the time parameters of each logic module finely and accurately simulates the timing relationship of the digital system.The hardware description of the simulated circuit is simple, intuitive and easy to write, and the user can define the function block circuit , Which has a strong analog function and use value. The system is written in pascal language, versatile, easy to transplant.