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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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Replies to This Discussion
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Permalink Reply by +M.Tariq Malik on
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CS401-assignment-sol
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Permalink Reply by Sohail Basheer on
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it is not the solution
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Permalink Reply by Moatar batool on
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I'm not getting it sir. how can we use this n where ?
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Permalink Reply by M Umar Idrees on
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Respected sir
This is can not be the solution in any case.Kindly share the solution which is pertinent to the question.
Thanks
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Permalink Reply by muhammad salman khan on
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A.o.A Vu ID kahan dy gay code ma
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This is as close to the working solution as i can get, can someone make some amendments here according to the instructions
https://stackoverflow.com/questions/57134021/how-to-print-a-string-...
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CS401 Assignment No 03 Spring 2019 Idea Solution
#Check ur self
#Code
[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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[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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it is not correct. Please read question once.
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correct 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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