Everything about Vector Monitor totally explained
Graphical displays for early computers used
vector monitors, a type of CRT similar to the
oscilloscope but typically using magnetic, rather than electrostatic, deflection. Here, the beam traces straight lines between arbitrary points, repeatedly refreshing the display as quickly as possible.
Vector monitors were used by some late-1970s to mid-1980s arcade games such as
Asteroids.
Vector displays for computers didn't noticeably suffer from the display artifacts of
Aliasing and
pixelization, but were limited in that they could display only a shape's outline (advanced vector systems could provide a limited amount of shading), and only a limited amount of crudely-drawn text (the number of shapes and/or textual characters drawn was severely limited, because the speed of refresh was roughly inversely proportional to how many vectors needed to be drawn). Some vector monitors are capable of displaying multiple colors, using either a typical tri-color CRT, or two phosphor layers (so-called "
penetration color"). In these dual-layer 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.
Other graphical displays used '
storage tubes', including
Direct View Bistable Storage Tubes (DVBSTs). These CRTs inherently stored the image, and didn't require periodic refreshing.
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