Re: ::: vuaskari.com ::: plz any body send solution of cs401

; TSR Program to change the background color of DOS when key is pressed
[org 0x0100]
jmp start

oldisr: dd 0 ; space for saving old ISR

; subroutine to clear the screen
clrscr: push es
push ax
push cx
push di

mov ax, 0xb800
mov es, ax ; point es to video base
xor di, di ; point di to top left column
mov ax, 0x0720 ; space char in normal attribute
mov cx, 2000 ; number of screen locations

cld ; auto increment mode
rep stosw ; clear the whole screen

pop di
pop cx
pop ax
pop es
ret

; keyboard interrupt service routine
kbisr: push ax
push es
push cx
push dx

mov ax, 0xb800
mov es, ax ; point es to video memory

in al, 0x60 ; read a char from keyboard port
cmp al, 0x22 ; has the g key pressed
jne nextcmp ; no, try next comparison

mov ax, 0x600 ; setting green background
mov bh, 0x2a ; attribute of color
mov cx, 0000h ; where the color starts to point
mov dx, 184fh ; where the color ends to point
int 10h
jmp exit ; leave interrupt routine

nextcmp: cmp al, 0x30 ; has the b key pressed
jne nocmp ; no, chain to old ISR

mov ax, 0x600 ; setting blue background
mov bh, 0x19 ; attribute of color
mov cx, 0000h ; where the color starts to point
mov dx, 184fh ; where the color ends to point
int 10h
jmp exit ; leave interrupt routine

nocmp: pop dx
pop cx
pop es
pop ax
jmp far [cs:oldisr] ; call the original ISR

exit: mov al, 0x20
out 0x20, al ; send EOI to PIC

pop dx
pop cx
pop es
pop ax
iret ; return from interrupt

start: call clrscr ; clear the screen

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 interrupts

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 resident
int 0x21

On Thu, Jun 9, 2011 at 10:10 AM, wafiullah naeemzi <wnaeemzi@gmail.com> wrote:

plz br help me in cs401

On Thu, Jun 9, 2011 at 8:58 AM, mc100401317 Razia Sultana <mc100401317@vu.edu.pk> wrote:

mery pass jo file hy wo execute nahi ho rahi hy plz send me  execute able file

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