by the CRT phosphor itself. But like an Etch A Sketch, the accumulated image could be modified or moved only by flash-erasing the entire screen and then slowing redrawing everything with data resent from some large computer. This was much less interactive than the PDS-1 and could not show animations.

On other displays of this era, text fonts were hardwired and could not be changed. For example, the operator consoles of the CDC 6600 formed