Operating System (OS)
Multiprogramming

is a method of allocating processor time.
consists of those addresses that may be generated by a processor during execution of a computation.
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
None of these
allows multiple programs to reside in separate areas of core at the time.

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Operating System (OS)
Addressing modes

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.
None of these
All of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.

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