Operating System (OS)
Addressing modes

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.
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 spooler is a

Program that coordinates the print job that are waiting to process
Queue of print job that are waiting to print
Location in memory that maintains the contents of documents until it prints
Message sent from the printer to the operating system when a print job is completed

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