Operating System (OS)
Assembler language

requires fixed-format commands
is usually the primary user interface
is quite different from the SCL interpreter
None of these
is a mnemonic form of machine language

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Operating System (OS)
Addressing modes

performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
All of these
defines the fundamental method of determining effective operand addresses

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