BCA215 - Computer Organization

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BACHELOR OF COMPUTER APPLICATIONS (BCA)

SEMESTER - II

SUBJECT CODE & NAME

BCA215 - Computer Organization

Q1.  What do you mean by addressing modes? List the different types of addressing modes. 3+7

Answer. Addressing Modes

In general, a program operates on data that reside in the computer’s memory. These data can be organized in a variety of ways. If we want to keep track of students’ names, we can write them in a list. If we want to associate information with each name, for example to record telephone numbers or marks in various courses, we may organize this

Q2 Explain the programmer’s model of 8086. 10

Answer. The programmer’s model of 8086 is the most important concept to study in the 8086 model. Figure below shows the register organization of 8086. This is termed as the Programmer’s model of 8086. The registers shown in the programmer’s

Q3 Explain the process of fetching a word from the memory. 10

 Answer. To fetch a word of information from the memory CPU must specify the address of the memory location where this word is located and request a read operation. This includes whether the information to be fetched represents an instruction

Set - 2

Q1. Write a note on replacement algorithms. 10

Answer. When a new block is to be  brought into the cache and all the positions that it may occupy are full, then the cache controller must decide which of the old blocks to overwrite. Because the programs usually stay in localized areas for a reasonable period of time, there is high probability that the blocks that have been referenced recently will be

Q2. Explain the concept of coprocessor. Also explain its functions. 4+6

Answer. Coprocessor

Coprocessor is a relatively new concept in the area of multiprocessing. A coprocessor refers to a computer processor which is utilized as an addition to the functions of the cpu (the primary processor). A coprocessor is also known as a math processor or a numeric processor. It is capable of carrying out large amount of computations, thereby

Q3. How CPU responds to an interrupt? 10

Answer. The CPU checks periodically to determine if an interrupt signal is pending. This check is usually done at the end of each instruction, although some modern machines allow for interrupts to be checked for several times during the execution of very long instructions. When the CPU detects an interrupt, it then saves its current state (at least the PC

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