CS401 Assignment No 3 Solution Spring 2019

CS401 Assignment No 3 Spring 2019

Dear Students, Here you can read or Download CS401 - Computer Architecture and Assembly Language Programming Assignment No 3 Solution and Discussion of Semester Spring 2019. CS401 Assignment Due Date is 22 July 2019. This assignment covers video lectures 23 to 27. Total Marks are 20. We are here to facilitate your learning and we do not appreciate the idea of copying or replicating solutions. CS401 Assignment Solution File has been added. Previously we shared CS408 Assignment No 3 Solution Spring 2019

CS401 Assignment No 3 Solution and discussion Spring 2019

CS401 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 the submitted solution is copied from any other student or from the internet.

Also Read: CS401 Current and Past Mid Term Paper Spring 2019

Please Note:

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

Topic Covered in CS401 Assignment No 3:

• String Instructions
• Programmable Interval Timer
• Timer Interrupt

CS401 Assignment Question:

Write assembly language (Terminate and Stay Resident) program that will print your complete VUID (only when specific timer ticks are lapsed) by hooking Timer Interrupt. (20 Marks)

Details:

• In this program, you have to hook Timer Interrupt and write your own Interrupt Service Routine (ISR) which will store timer count (tick count)
• In order to store total tick count, use a double word variable
• As soon as tick count reaches last digit of your VUID, your VUID must be printed on the screen. You may treat VUID as a String and give its address and length as a parameter to the subroutine. As an alternative, you may also use String Instructions (like LODS or STOS for printing)
• For Example: if student ID is BC180212356 then after 6 tick counts, BC180212356 should be displayed on the screen.
• There’s no need to include screenshots of final output. Your solution file must be a single Word file containing complete code.

Recommended: CS504 Assignment No 3 Solution Spring 2019

CS401 Assignment No 3 Solution Spring 2019

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Spring 2019 Assignments:

• CS605 Assignment No 3 Solution Spring 2019
• ACC501 Assignment No 1 Solution Spring 2019
• CS502 Assignment No 3 Solution Spring 2019
• CS402 Assignment No 3 Solution Spring 2019

CS401 Assignment 3 Solution Sample Preview

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CS401 Assignment no 3 Solution Spring 2019 Sample Preview

[org 0x0100]

jmp start

oldisr: dd 0 ; space for saving old isr

; keyboard interrupt service routine

kbisr:

push ax

push es

mov ax, 0xb800

mov es, ax ; point es to video memory

in al, 0x60 ; read a character from keyboard port

cmp al, 0x11 ; has the 'w' key pressed

jne nomatch ; no, go to nomatch

mov byte [es:0], '1' ; yes, print 1

mov byte [es:2], '5' ; yes print 0

jmp exit ; leave interrupt routine

nomatch:

pop es

pop ax

jmp far [cs:oldisr] ; call the original ISR

exit

mov al, 0x20

out 0x20, al ; sent EOI to PIC

pop es

pop ax

iret ; return from interrupt

start:

xor ax, ax

mov es, ax ; point es to IVT base

mov ax, [es:9*4]

mov [oldisr], ax ; save offset of old routine

mov ax, [es:9*4+2]

mov [oldisr+2], ax ; save segment of old routine

cli ; disable interrupts

mov word [es:9*4], kbisr ; store offset at n*4

mov [es:9*4+2], cs ; store segment at n*4+2

sti ; enable interrupt

mov dx, start ; end of resident portion

add dx, 15 ; round up to next para

mov cl, 4

shr dx, cl ; number of paras

mov ax, 0x3100 ; terminate and stay residant

int 0x21

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