Operating System (OS)
All of the following are task performed by the operating system except

Provides an interface for user to interact with computer
Performing housekeeping task like file compression and disk defragmentation
Managing hardware on the computer
Controlling the access that application program has to the CPU

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Operating System (OS)
Addressing modes

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