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DRIVE
SPRING 2017
PROGRAM
B.SC IT
SEMESTER
SECOND
SUBJECT
CODE & NAME BT0068, Computer Organization and Architecture
1. What is a digital computer? Explain using a diagram.
Answer: Digital computers use
the binary number system, which has two digits: 0 and 1. A binary digit is
called a bit.
Information is represented in digital computers in groups of bits. By using
various coding techniques, groups of bits can be made to represent not only
binary numbers but also other discrete symbols, such as decimal digits or
letters of the alphabet. By
2 Mention different types of buses. Give a brief explanation about
each of them.
Answer: The CPU
moves data around the computer on pathways that interconnect it to all the
other components on the motherboard. These pathways are called 'buses'.
The internal bus carries data
within
3 Using block diagram explain Von Neumann architecture.
Answer: The von Neumann
Architecture is based on three key concepts:
1. Data and
instructions are stored in a single read-write memory.
2.
The content of this
4
What is a cache memory and on what principle it is based upon?
Answer: For all instruction cycles, the CPU accesses the
memory at least once to fetch the instruction and sometimes again accesses
memory to fetch the operands. The rate at which the CPU can execute
instructions is limited by the memory cycle time. This limitation is due to the
mismatch between the memory cycle
5 Write short notes on I/O modules.
Answer: It is the entity within a computer that is
responsible for the control of one or more external devices and for the
exchange of data between those devices and main memory and/or CPU. Thus I/O
memory must have
�
Interface to CPU
6 Using a block diagram explain DMA controller.
Answer: DMA has been a built-in feature of PC architecture
since the introduction of the original IBM PC. PC-based DMA was used for floppy
disk I/O in the original PC and for hard disk I/O in later versions. PC-based
DMA technology, along with high-speed bus technology, is
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