Automation System
The SKETCHPAD system

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

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Automation System
A dc servo motor:

None of these
can provide precise position control
uses a tachometer for speed feedback
uses a variable dc voltage for speed control
All of these

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