 Vector monitors were used in early computer aided design systems and are in some late-1970s to mid-1980s arcade games such as "Asteroids".They draw graphics point-to-point, rather than scanning a raster.Either monochrome or color CRTs can be used in vector displays, and the essential principles of CRT design and operation are the same for either type of display; the main difference is in the beam deflection patterns and circuits.