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Computer Architecture and Assembly Language Programming (CS401) Assignment No. 1

Total marks = 20                                                                               Deadline Date: November 14, 2023

Please carefully read the following instructions before attempting assignment.

RULES FOR MARKING

It should be clear that your assignment would not get any credit if:

• The assignment is submitted after the due date.
• The submitted assignment does not open or file is corrupt.
• Strict action will be taken if submitted solution is copied from any other student or from the internet.

 

You should concern the recommended books to clarify your concepts as handouts are not sufficient.

You are supposed to submit your assignment in .doc or docx format.

Any other formats like scan images, PDF, zip, rar, ppt and bmp etc. will not be accepted.

Lectures covered: 1-10

Topics covered: Data Declaration and Direct Addressing, Indirect Addressing, Branching, Unconditional jumps and relative addressing

NOTE

No assignment will be accepted after the due date via email in any case (whether it is the case of load shedding or internet malfunctioning). Hence refrain from uploading assignment in the last hour of the deadline. It is recommended to upload your solution file at least two days before its closing date.

If you find any mistake or confusion in the assignment (Question statement), please contact your instructor before the deadline. After the deadline, no queries will be entertained in this regard.

For any query, feel free to email at cs401@vu.edu.pk

Problem statements:

Mr. Zaid is a student of Virtual University of Pakistan, his VUID is BC230212345. In Fall 2023, he enrolled himself in the CS401, Computer Architecture and Assembly Language Programming. Mr. Zaid has very good programming skills in Assembly language programming. He wrote an assembly language program in which he used direct addressing method to store some data at specific segment: offset pair. The segment address he provided were the first four numeric digits of his VUID, while offset he provided were preceding four numeric digits i.e., first four digits of his VUID are 2302 and preceding four numbers are 1234. The data he stored in the given offset pair was stored in specific 24254 address in the physical memory.

Task No. 1 (10 Marks)

You are required to use your own VUID as Mr. Zaid did, and do the following tasks:

1)      Find out the physical address from your segment: offset pair.

2)      What will be the last possible physical address accessible using your segment address?

3)      What will be the first possible physical address accessible using your segment address?

4)      Write assembly language instruction(s) to store any data in your offset address of current code segment.

5)      Write assembly language instruction(s) to store any data in your segment offset pair.

Note: Assume the VUID is already in hexadecimal format, so you don’t have to convert it.

 

Task No. 2 (10 Marks)

Write assembly language program that:

a)       Stores VUID in the memory.

b)      Sums up all even digits of your VUID.

c)       Sums up all odd digits of your VUID.

d)      Subtracts the sum of odd digits from the sum of even digits.

e)       Stores the result in memory.

Submission details:

Following are required in a single MS-Word document.

a)       Solution(s) of task 1.

b)      Assembly language program for task 2.

c)       Screenshot showing the results.

 

 “Best of luck”

SOLUTION:

FOR PAID SOLUTION CONTACT ME ON WHATSAPP

https://wa.me/923037155010

 

Change highlighted text according to VUID

TASK No. 1

1)      Find out the physical address from your segment: offset pair.

Physical Address = Segment + Offset

VU ID = BC230212345

Segment: 2302

Offset: 1234.

Physical Address 23020 + 01234

Physical Address = 24254

2)      What will be the last possible physical address accessible using your segment address?

Physical Address Segment + Max Offset

Max Offset FFFF

Physical Address = 23020 + OFFFF

Physical Address 3301F

3)      What will be the first possible physical address accessible using your segment address?

Physical Address Segment + Min Offset

Min offset 0000

Physical Address = 23020 + 00000

Physical Address 23020

 

4)      Write assembly language instruction(s) to store any data in your offset address of current code segment.

.org Ox01001

data: dw 45

mov byte [offset_address], data

mov ax, 0x4c00

int 0x21

5)      Write assembly language instruction(s) to store any data in your segment offset pair.

org[Ox01001

data: dw 3456

mov ax, Ox1904

mov ds, ax

mov [segment_address], data

mov ax, 0x4c00

int 0x21

****************************************************************************************************************************

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Task No. 2

[org 0x0100]

jmp start

stdId: dw 1, 6, 0, 4, 0, 4, 5, 6, 7

odd_sum: dw 0

answer: dw 0

start:

mov bx, stdId

mov cx, 9

xor ax, ax 

loop1:

mov dx, [bx]        

test dx, 1         

jnz odd_number

add ax, dx         

jmp next_number

odd_number:

add [odd_sum], dx  

next_number:

add bx, 2

sub cx, 1

jnz loop1

sub ax, [odd_sum] 

mov [answer], ax

mov ax, 0x4c00

int 0x21