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

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Automation System
Time proportioning control:

None of these
a and b above.
cannot use a TM990 micro¬computer
is less efficient than normal PID control
can be used on a PM550 programmable process controller

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