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PROGRAM - B.SC IT

SEMESTER - SECOND

SUBJECT CODE & NAME

BT0068 & Computer Organization and Architecture

CREDIT - 4

BK ID - B0952

MAX. MARKS - 60

Q1. Perform the following conversions : 5*2 = 10

1. (437.1)8 = ()10

2. ( AB)16= ()10

3. ( 87.5)10 = ()2

4. ( 721)8=()16

5. ( AB1)16=()8

Ans:

1. (437.1)8 = (287)10

2. (AB)16= (171)10

3. (87.

Q2. What is a bus? Explain its structure. 4+6 = 10

Ans: What is a bus: A bus consists of 1 or more wires. There's usually a bus that connects the CPU to memory and to disk and I/O devices. Real computers usually have several busses, even though the simple computer

Q3. Explain the how instruction are represented in CPU with necessary diagram and example. 6+4 = 10

Ans: Instruction Representation: Each instruction is represented by a sequence of bits. The instruction is divided into fields, corresponding to the constituent elements of the instruction. This layout of the instruction is called Instruction Format. With most instruction sets, more than one format is

Q4. Explain memory interleaving with the help of a diagram. 6+4 = 10

Ans: Memory interleaving: Another technique called memory interleaving divides the system into anumber of modules and arranges them so that successive words in the address space are placed in different modules. If memory access requests are made for consecutive addresses, then the access will be made for different modules. Since parallel access to these modules is possible, the average rate of fetching words

Q5. What is magnetic disk? Describe data organization and formatting of magnetic disk. 3+7 = 10 Ans: Magnetic Disk: A disk is a circular platter constructed of metal or of plastic coated with a magnetic material. Data are recorded on and later retrieved from the disk via a conducting coil named the head. During a read or write operation, the head is stationary while the platter rotates beneath it. Writing is achieved

Q6. What is an interrupt? Explain how CPU responses to an interrrupt. 5+5 = 10

Ans: Interrupt: An interrupt is an exception condition in a computer system caused by an event external to the CPU. Interrupts are commonly used in I/O operations by a device interface (or controller) to notify the CPU that it has completed an I/O operation. An interrupt is indicated by a signal sent by the device interface to the CPU via an interrupt request line (on an external bus). This signal notifies the CPU

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