Color Displays
Some vector monitors are capable of displaying multiple colors, using either a typical shadow mask RGB CRT, or two phosphor layers (so-called "penetration color").
Atari used the term Color Quadrascan to describe the shadow mask version when used in their video game arcades.
In the penetration tubes, by controlling the strength of the electron beam, electrons could be made to reach (and illuminate) either or both phosphor layers, typically producing a choice of green, orange, or red.
Tektronix made color oscilloscopes for a few years using penetration CRTs, but they apparently weren't in great demand.
Read more about this topic: Vector Monitor
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