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

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Automation System
An encoder:

converts an input to a binary number
None of these
is used to send telegraph signals
can have only four keys
converts a binary number to a decimal number.

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