Automation System
Computer-based controllers:

are very difficult to change
are very flexible
should be built in a modular fashion wherever possible
None of these
(a) and (c) above

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Automation System
The SKETCHPAD system

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

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