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.
is used for interactive Graphics
All of these
is expensive because it is sophisticated and make demands on the power and resources of the computer.
None of these

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Automation System
The use of specialized workstations:

has a high cost-performance tradeoff
reduces the host computer workload and allows more users
provides limited growth potentials for 3-D
None of these
reduces the host computer workload

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Automation System
Digital signals:

can have three possible levels
have a sinusoidal shape.
have a frequency measured in units of hertz
None of these
are assigned values of 1 or 0 depending on the voltage level

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