Automation System
Historically, central systems were used because:

All of these
None of these
memory was very expensive
semiconductor memory was not available
memory consumed a large amount of power

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Automation System
The SKETCHPAD system

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

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