Operating System (OS)
A program

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

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Operating System (OS)
Addressing modes

defines the fundamental method of determining effective operand addresses
None of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
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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