— An application program is input and stored in the system memory along with a graphics package. Graphics commands in the program are translated by the graphics package into a display file stored in the system memory.
— This display file is then accessed by the display processor to refresh the screen.
— The display processor cycles through each command in the display file program once during every refresh cycle.
— Graphic patterns are drawn on a random scan system by directing the electron beam along the component lines of the picture.
— Lines are defined by the values for their co-ordinate endpoints, and these input co-ordinate values are converted to x and y deflection voltages. A scene is then drawn one line at a time by positioning the beam to fill in the line between specified endpoints.
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