Operating System (OS)
Addressing modes

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

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Operating System (OS)
Under virtual storage,

None of these
a single program is processed by two or more CPUs
interprogram interference may occur
only the active pages of a program are stored in primary storage
two or more programs are stored concurrently in primary storage

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