Operating System (OS)
Multi programming systems ......

Are easier to develop than single programming system
Are used only by large mainframe computer
Execute each job faster
Execute more jobs in the same time period

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Operating System (OS)
Semaphores

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

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Operating System (OS)
The CPU, after receiving an interrupt from an I/O device

hands over control of address bus and data bus to the interrupting device
branches off to the interrupt service routine immediately
branches off to the interrupt service routine after completion of the current instruction
None of these
halts for a predetermined time

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