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

All of these
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
have both their operands in the main store.

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Operating System (OS)
System generation:

None of these
varies in difficulty between systems
requires extensive tools to be understandable
is always very difficult
is always quite simple

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