Operating System (OS)
Object code

must be "loaded" before execution
is the output of compilers, but not assemblers
None of these
must be rewritten before execution
is ready to execute

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

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

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

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