computer graphics in the 1950s

Bryan Pope wrote: That's true of many (but not all) the B&W vector games, such as Battlezone and Red Baron, but not of the color vector games. In the color vector games, the CRT itself introduces pixelization, because of the holes in the shadow mask and the discrete phosphor dots. The resolution isn't really all that great. There was a color vector display technology that didn't use a shadow mask or phosphor dots, but it was very uncommon. It used two layers of phosphor with different activation energies, and the high-voltage supply was actually switched between two voltages. The lower voltage only activated one phosphor, but the higer voltage activated both, so two different colors were available. This was used in the DEC VR20 monitor, of which few units were believed to have been sold.