Operating System (OS)
What is the name of the operating system which was originally designed by scientists and engineers for use by scientists and engineers?

None of these
UNIX
XENIX
MS DOS
OS/2

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Operating System (OS)
Addressing structure

are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
None of these
defines the fundamental method of determining effective operand addresses
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these

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