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IGNOU UNIVERSITY MCA - I (SEM 1) DEC 2009 : Computer Organisation & Assembly Language Programming

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MCS-012 MCA (Revised) .1* O 0 Term-End Examination December, 2009 O MCS-012 : COMPUTER ORGANISATION & ASSEMBLY LANGUAGE PROGRAMMING Time : 3 hours Maximum Marks : 100 (VVeightage 75%) Note : Question number 1 is compulsory and carries 40 marks. Attempt any three questions from the rest. 1. (a) Differentiate between SRAM and DRAM. Draw the cell of a DRAM. 5 Explain the use of I/O interface in digital circuits. 5 Prepare the truth table for the following boolean expressions and simplify them using K-Maps. 5 (i) ABC+ABC (A+B) . ( A+B) (d) Explain the functioning of a 3-bit synchronous counter with the help of its logic diagram. MCS-012 1 5 P.T.O. (g) (h) 2. 3. (a) (a) MCS-012 Explain how does a CPU fetches and executes a simple ADD instruction using microoperations. Make suitable assumptions whereever necessary. Explain any five features of RISC architecture. Explain the working of the following instructions in 8086 processor. MOV AX, BX MOV AX, [BX] (iii) MOV AX, [BX + SI] Make suitable assumptions if any. Write an assembly language program for 8086 micro processor to add two 32 bit numbers. Explain any six addressing modes with the help of an example each. Write the code sequence in 8086 assembly language for performing the following operation- Z == ((A B)/10*C) * * 2. What is a segment in 8086 microprocessor ? Discuss the advantages of segmentation in this processor. How addresses are calculated in 8086 microprocessor ? Discuss the differences between Hardwired Control and Microprogrammed Control Units. 2 5 5 5 5 9 5 6 5 (b) What will be the value for R2 operand if : 5 Mask operation clears register R1 Bits 10110001 is to be inserted in an 8 bit R1 register. You may assume the contents of R1 initially as 01010101. (c) Explain the process of subroutine CALL and RETURN with the help of a suitable diagram. (d) Explain how data is stored in a CD-ROM with the help of a suitable diagram. 5 (a) Which of the I/O techniques does not require an interrupt signal ? Is this technique useful in multiprograming operating systems ? Give reason. 5 Calculate the number of entries required in the FAT table using the following parameters for an MS-DOS system. 4. 5 5 Disk capacity 30MB Block Size 512 bytes Blocks/Cluster 4. Explain the term Resolution and how it applies to Monitors, Printers and Scanners. 5 (d) What is RAID ? What are the techniques used by RAID for enhancing reliability. 5 MCS-012 3 P.T.O. 5. (a) Add the following numbers in 8-bit register 4 using 2's complement notation. +50 and 5 + 45 and 65 (iii) + 75 and +85 Also indicate the overflow if any. (b) Explain the following terms with the help 16 of an example/diagram/illustration if needed. SCSI I node Daisy chain interrupt handling Address space in virtual memory .EXE files INT 21h Assembler Encoder -o0o- MCS-012 4

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Additional Info : Mca - I (sem 1) December 2009 Question Paper - Computer Organisation & Assembly Language Programming(Revised Course
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