Automation System
Historically, central systems were used because:

All of these
None of these
memory was very expensive
semiconductor memory was not available
memory consumed a large amount of power

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Automation System
There are several procedures you can implement to provide maximum security. The most important of these is:

do not leave training manuals unsecured
Verify the reputation of the people installing your system
None of these
run regular simulated tests using TARP (testing of Applications Recovery Planes)
do not allow unbonded service people to work on your equipment

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Automation System
A common data base is one requisite for converting CAD and CAM to CIM. Another is that:

there should be a common 3-D part description system.
the user must have access to both hardware and software
technical assistance must be provided to the user.
None of these
the system must make provision for new techniques.

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