Automation System
The SKETCHPAD system

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

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Automation System
Relay ladder logic is used in a PC because:

None of these
it is the best industrial control language ever developed.
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
All of these
it is impossible to write a control program for a machine in any other logic

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