Automation System
A sequence controller:

is difficult to program
is no longer in widespread use
performs on/off control functions in relation to time.
is a mechanical only controller
None of these

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

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