initialize graphics

In System/38 graphics, to enter the graphics environment. The graphics environment is the state in which calls to GDDM and PGR routines can occur.; 在IBM System/38的图形子系统中,进入制图环境时的一种状态。这种制图环境是通过 调用GDDM和PGR例行程序而出现的一种状态。