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

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Operating System (OS)
A real time operating system is most likely to be used for which of the following task?

Controlling access to a shared printer in a network
Controlling the fuel injection system of an automobile engines
Managing the access to system files in a laptop computers
Ensuring that system clock works correctly on server

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Operating System (OS)
Semaphores

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

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Operating System (OS)
The Storage-to-Storage instructions

which perform indicated operations on two fast registers of the machine and have the result in one of the registers
None of these
have both their operands in the main store.
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, expect in the case of store operation when it is also
All of these

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