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CS401 Assignment No 03 Spring 2019 Solution & Discussion
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Spring 2019_CS401_3.docx, 55 KB
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Permalink Reply by +M.Tariq Malik on
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Please Discuss here about this assignment.Thanks
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Permalink Reply by Sohail Basheer on
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Tariq bhai please share idea of solution.
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CS401 Assignment#03 Complete Solution Spring 2019
Link below
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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)
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Anyone please discuss solution.
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Anyone please discuss solution.
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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
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Permalink Reply by Moatar batool on
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sir is mein changings karni hain? taky sab ka same nah ho...copy paste lagy ga esay to
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Permalink Reply by M Umar Idrees on
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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.
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[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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Where is it to be displayed?
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does any one have the correct solution? Kindly share
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