Operating System (OS)
System generation:

requires extensive tools to be understandable
varies in difficulty between systems
is always quite simple
None of these
is always very difficult

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Operating System (OS)
Addressing structure

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

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