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

None of these
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
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.

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Operating System (OS)
Semaphores

synchronize critical resources to prevent contention
None of these
synchronize critical resources to prevent deadlock
are used to do I/O
are used for memory management

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