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Thread: CS401 assignment #1 fall 2010 solution required due date 08 Nov2010

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    Bfly CS401 assignment #1 fall 2010 solution required due date 08 Nov2010

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    CS401- Computer Architecture and Assembly Language Programming
    Assignment # 1
    Fall 2010
    Total Marks: 20
    Due Date
    Your assignment must be uploaded before or on 8th Nov 2010.
    Upload Instructions
    Please view the document related to assignment submission process provided to you by the Virtual University to upload the assignment.
    Rules for Marking
    Kindly note that your assignment will NOT be graded if:
     It is submitted after due date
     The file you uploaded does not open
     The file you uploaded is copied from someone else
     It is in the format other than .doc
    Objective
    This assignment has been designed to enable you:
     To understand how effective address is calculated
     To understand how physical memory address is calculated
     To understand Register
     To understand the use of debugger and how to read value from Debugger


    Assignment

    Question_1: [marks: 5]
    What is the effective address generated by each of the following instruction?
    Initially AX= 0x0FED, BX=0x0400, label=0x04201, and SI=0x00E1
    (Offsets in part a, b and f are in decimal)


    a. mov ax, [bx+65]
    b. mov bx, [ax+35]

    c. mov ax, [bx+label]
    d. mov bx, [label+ax]

    e. mov bx, [ax+si]


    Question_2: [marks: 5]
    Calculate the physical memory address generated by the following segmentffset pairs (both are hexadecimal values).

    a. 0000:FFFF
    b. 0100:0100

    c. DEF8:2222
    d. 543F:3254
    e. FFFF:AAAA


    Question_3:
    Write the given program, assemble it and then analyze it in Debugger [marks: 10]

    [org 0x0100]
    mov al, [num1]
    mov bl, [num1+1]
    mov bl, [num1+2]
    add al, bl
    mov ax, 0x4c00
    int 0x21


    num1: db 5, 10, 15, 0


    After analysis you have to provide all information that is asked under:

    al,bl and IP Register

    You have to fill the table given below and write the values of al,bl and IP registers before and after execution of an instruction as you analyze in debugger. You also have to give reason that why the value of al,bl and IP registers change after a particular instruction. Give reason in corresponding column.

    Instruction Before Execution After Execution(with Reasons)
    Value of al Value of bl Value of IP Value of al Value of bl Value of IP
    mov al,[num1]

    mov bl,[num1+1]

    add al,bl

    mov bl,[num1+2]

    add al,bl

    mov [num1+3],al


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    You also have to provide the following information

    Address of num1=?
    Address of num1+1=?
    Address of num1+2=?
    Address of num1+3=?
    Value of num1+3(at end of program) =?

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