IGNOU ‘Introduction to Computer Organization’ Papers

CS – 64: Introduction to Computer Organization

Time: 3 hours                                                                                    Maximum Marks: 75

Note: Question number 1 is compulsory. Answer any three questions from the rest.

1.  (a) Describe the following in the context of computer organisation and / or 8086 microprocessor, with the help of an example, if  necessary :  (15)

(i) Use of Interrupt 21H for data string input
(ii) Characteristics of Von Neumann machine
(iii) Types of programmer visible registers
(iv) Selective complement and Insert operation
(v) Write a program to illustrate addition of two 8-bit registers in 8086 having packed BCD numbers.

(b) Discuss how floating point numbers are represented in a computer. Take suitable examples.  (5)

(c) Discuss the instruction fetch and execute cycles in a digital computer.  (5)

(d) Simplify the following boolean function:  (5)

2. (a) Draw and briefly explain the memory hierarchy.  (6)

(b) Briefly explain the terms unit of transfer and access modes for the memory system.  (5)

(c) Write the steps involved in the communication of l / O module  with the peripheral for a read or write operation.  (4)

3. (a) Explain any two addressing schemes for the computer system, with suitable examples.  (10)

(b) Draw and explain the basic structure of CPU.  (5)

4.  (a) Draw and explain the architecture of microcomputer.  (10)

(b) What is an interrupt? How is it processed?  (5)

5. (a) Write an 8086 assembly language program to find the smallest and largest of the values in an array.  (10)

(b) How are assembly language routines interfaced with high level  language programs?   (5)