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Problem with ISR code AT89c51

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vreg

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Hi, could someone please tell me what is wrong with the code. I want to use keyboard interrupts in AT89c51 to turn on an led when someone presses the button
led.JPG

Code: 
ORG 0 
LJMP MAIN

;--ISR for INT
ORG 003BH ;Vector Address for Keyboard interrupt
setb P1.3 ;turn on LED
RETI ;return from ISR

ORG 0100H
MAIN:
clr p1.3
mov 0B1h,00000001b ;enable keyboard interrupt
mov 9Dh, 10000000b	;Set KBF. 7 bit in KBF register to enable interrupt request
mov 9Ch, 10000000b	;Set KBLS7 to enable a high level detection on Port line 7.
HERE: SJMP HERE

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