Automation System
The SKETCHPAD system

None of these
is used for interactive Graphics
All of these
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
is expensive because it is sophisticated and make demands on the power and resources of the computer.

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Automation System
D/A (digital to analog) conversion:

must be fed through a filter to reproduce the original signal accurately
None of these
results in a binary code as the final output
has to be sampled at 1/2 the highest input frequency
both (b) and (c)

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