本文论述了计算机数控CRT显示的一般原理。着重叙述了CRT显示程序的结构,包括在线笔离线显示二个方面。还叙述了CRT显示程序和系统程序的关系。指出显示程序在前后台型系统程序和中断型系统程序中的位置及调用方式。最后提出编制CNC显示程序应注意的有关问题及编程技巧。 This article discusses the general principle of computer numerical control CRT display. The structure of the CRT display program is emphatically described, including two aspects of online pen offline display. Also describes the relationship between the CRT display program and the system program. Pointed out that the program shows the location of the front and back stage system programs and interrupt system programs and call. In the end, it puts forward some problems and programming skills that should be paid attention to when programming CNC display.