CS401 Assignment 3 Solution 2021 with Solution File | JobMarkaz | Virtual University

 

Download Solution File of CS401 Assignment 3 2021 | Virtual University

Program:

[org 0x0100]

jmp start

oldisr: dd 0

kbisr:

push ax

push es

mov ax, 0xb800

mov es, ax

in al, 0x60

cmp al, 0x39

jne nextcmp

mov ax, 0600h

mov bh, 20h

mov cx, 0000h

mov dx, 1827h

int 10h

nextcmp:

cmp al, 0xB9

jne nextcmp1

mov ax, 0600h

mov bh, 17h

mov cx, 0040h

mov dx, 184Fh

int 10h

nextcmp1:

pop es

pop ax

jmp far [cs:oldisr]

start:

xor ax, ax

mov es, ax

mov ax, [es:9*4]

mov [oldisr], ax

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

mov [oldisr+2], ax

cli

mov word [es:9*4], kbisr

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

sti

rs:

mov ah,0

int 0x16

cmp al,13

jne rs

mov ax,4C00h

int 21h

; end here 

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