We introduce a method and implementation process of screen plotting by calling as-sembler subprogram in IBM-PC COBOL, and disuss methods of data transfer betweenCOBOL and assembly language.

• 介绍了IBM-PC COBOL语言调用汇编子程序进行屏幕绘图的方法及实现过程,并讨论了COBOL语言与汇编语言传递数据的方法。