required solution of cs401 assignment No 03.!

[waqas.aryan786]

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plz share the solution of cs401 assignment no.03 .........!due date is 11-06-2012

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[Vuhelper]

ok....................

[Vuhelper]

; show scancode on external LEDs connected through parallel port
[org 0x0100]
jmp  start

oldisr:       dd   0                  ; space for saving old ISR

; keyboard interrupt service routine
kbisr:        push ax
push dx

in   al, 0×60           ; read char from keyboard port
mov  dx, 0×378
out  dx, al             ; write char to parallel port

pop  ax
pop  dx
jmp  far [cs:oldisr]    ; call original ISR

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 interrupts

mov  dx, start          ; end of resident portion
add  dx, 15             ; round up to next para

and keyboard comprisan code for this problems are

e = 0×012

r= 0×13

f= 0×21

s=0x1f