CS401 Assignment No 03 Spring 2019 Solution & Discussion

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[+ M.Tariq Malik]

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[Sohail Basheer]

Tariq bhai please share idea of solution.

[+ M.Tariq Malik]

CS401 Assignment#03 Complete Solution Spring 2019

Link below 

CS401 Assignment#03 Complete Solution Spring 2019

[+ M.Tariq Malik]

Q: 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)Q: 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)

[Sohail Basheer]

Anyone please discuss solution.

[Sohail Basheer]

Anyone please discuss solution.

[+ M.Tariq Malik]

cs401 assignment solution.

[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

[Moatar batool]

sir is mein changings karni hain? taky sab ka same nah ho...copy paste lagy ga esay to

[M Umar Idrees]

Sir none of the given solutions is according to the given requirements.We can not print our VUID after a lapse of certain tickcounts.First the tickcount will start printing and after the lapse of certain number of counts the VUID must be printed and at the same time the portion of the program should remain resident.

[+ M.Tariq Malik]

[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

[Sohail Basheer]

Where is it to be displayed?

[M Umar Idrees]

does any one have the correct solution? Kindly share