Operating System (OS)
Addressing modes

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

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Operating System (OS)
The dispatcher

puts tasks in I/O wait
is always small and simple
never changes task priorities
None of these
actually schedules the tasks into the processor

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