Operating System (OS)
Assembler language

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

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Operating System (OS)
Addressing structure

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

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Operating System (OS)
Round-robin scheduling

is quite complex to implement
None of these
gives each task the same chance at the processor
allows processor-bound tasks more time in the processor
allows interactive tasks quicker access to the processor

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

users can create system programs and run them as commands
None of these
the processing is much faster than would other-wise be the case when user defined commands are used
flexibility to the users in running lists of commands by simply collecting them in named batch command files
the command set being common across different hardware configurations

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