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

which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
All 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
None of these
have both their operands in the main store.

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Operating System (OS)
Under virtual storage,

None of these
only the active pages of a program are stored in primary storage
interprogram interference may occur
a single program is processed by two or more CPUs
two or more programs are stored concurrently in primary storage

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