Automation System
The SKETCHPAD system

is used for interactive Graphics
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

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Automation System
Today, programmable controllers:

All of these
are relatively low cost compared with the original digital equipment available for industrial control
are more powerful then the first controllers on the market
None of these
can be cost effective even when replacing just a few relays

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Automation System
Numerical control:

is a method for controlling the operation of a machine by means of a set of instructions
is a method for producing an exact number of parts per hour
applies only to milling machines
All of these
None of these

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