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

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Automation System
Direct Numerical Control means:

eliminating computers from the manufacturing process
complete elimination of a need for a human operator.
using one computer to control several machines
None of these
using several computers to control one large machine

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