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

None of these
the command set being common across different hardware configurations
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
users can create system programs and run them as commands

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Operating System (OS)
The Register - to - Register (RR) instructions

All of these
have both their operands in the main store.
which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, except in the case of store operation when it is also

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