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
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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Operating System (OS)
A program

is a device that performs a sequence of operations specified by instructions in memory.
None of these
is typically characterized by interactive processing and time of the CPU
is a sequence of instructions
is the device where information is stored

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