Operating System (OS)
Multiprogramming systems:

are used only on large mainframe computers
are easier to develop than single programming system
execute each job faster
execute more jobs in the same time period
None of these

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Operating System (OS)
Addressing structure

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