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Which of the following statements about the CPU's handling interrupts is incorrect? *

• None of the other choices

• The CPU branches to a new instruction sequence

• The hardware saves the old PC location

• The processor ceases to execute the current sequence of instructions

____ is the partitioning of a single server, each of which can support a different operating *

• Multiprocessing

• Multithreading

• Shared processing

• Virtualization

Consider a computer system that has cache memory, main memory (RAM) and disk, and OS uses virtual memory. It takes 1 nsec to access a word from the cache, 10 nsec to access a word from RAM, and 10 msec to access a word from the disk. If the cache hit rate is 95% and main memory hit rate is 99%, what is average time to access a word? *

• a. 1.445 nsec

• b. 5,001.445 nsec

• c. 5,000.495 nsec

• d. 5,000.95 nsec

Booting a general purpose computer involves the following steps except *

• a. Loading the OS

• b. Loading the command interpreter

• c. Loading one or more bootstrap loaders

• d. Execution of a ROM-based POST sequence

As one proceeds down the memory hierarchy (from inboard memory to offline storage), which of the following conditions is correct? *

• Decreasing access time

• None of the other choices

• Decreasing cost per bit

• Decreasing capacity

The two basic types of processor registers are: *

• User-visible and user-invisible registers

• None of the other choices

• Control and Status registers

• General and special registers

Consider a computer system that has cache memory, main memory (RAM) and disk, and OS uses virtual memory. It takes 2 nsec to access a byte from the cache, 20 nsec to access a byte from RAM, and 10 msec to access a block of 1000 bytes from the disk. If a book has 1000 pages, each with 50 lines of 80 characters each, How long it will take to electronically scan the text for the case of the master copy being in each of the level as one proceeds down the memory hierarchy (from inboard memory to offline storage)? *

• 1 msec, 10 msec, 5 sec

• 1 msec, 10 msec, 10 sec

• 2 msec, 20 msec, 10 sec

• 4 msec, 40 msec, 20 sec

The main characteristics of layered system does not include: *

• A. Upper layer can only call functions of closely lower layer

• B. Each layer has well defined functions

• C. Each layer runs independently

• D. Many layers

Which of special register in the CPU points to the top of the current stack in the memory?

• PC

• PSW

• IR

• SP

A CPU may have multiple execution units, so that can carry out multiple instructions in the same time is called: *

• None of the other choices

• Multicore

• Pipeline

• Superscalar