Automation System
Digital signals:

None of these
have a sinusoidal shape.
can have three possible levels
have a frequency measured in units of hertz
are assigned values of 1 or 0 depending on the voltage level

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Automation System
The program counter:

None of these
counts the number of instructions that have been executed
contains the address of the next instruction to be executed
is where arithmetic is done in a computer.
decides which program to run

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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.
is used for interactive Graphics
None of these
All of these

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