Operating System (OS)
The command interpreter

is menu drive
None of these
is quite different from the SCL interpreter
is usually the primary user interface
requires fixed format commands

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Operating System (OS)
Addressing modes

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
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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