Operating System (OS)
Assembler language

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

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Operating System (OS)
Addressing modes

None of these
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.
All of these
defines the fundamental method of determining effective operand addresses

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