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 used for interactive Graphics
All of these
is expensive because it is sophisticated and make demands on the power and resources of the computer.

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Automation System
The use of specialized workstations:

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

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