Automation System
The SKETCHPAD system

consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
None of these
is expensive because it is sophisticated and make demands on the power and resources of the computer.
All of these
is used for interactive Graphics

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Automation System
Resolution in a CRT refers to:

the speed at which the monitor can accept data from the computer
the number of phosphor dots that react when hit by the electron beam
the number of addressable elements on the tube
None of these
the number of pixels in each square centimeter

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