Operating System (OS)
Addressing modes

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

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Operating System (OS)
A co-processor

Is quite common in modern computer
Works with any application
Is relatively easy to support in software
Causes all processor to function equally

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