part detection project

i am unable to simulate following code in protous. output port p1 not giving any results as per programe. i need this code on urgent basis. pl. help me.

;******************************************************************************************************
;
;******************************************************************************************************
; XTAL Freq = 12 MHz

;DATA IN PORT P3
;+++++++++++++++++++++++++++++++++++
;
;##################################################
MOV P3,#0FFH ; P3 ASSIGNED AS INPUT PORT FOR LM324 OUTPUT


MAIN:
MOV A,P3
CLR C
SUBB A,#11111110B
JNZ NEXT
AJMP EMPTY

NEXT: MOV A,P3
CLR C
SUBB A ,#11111100B
JNZ NEXT1 ; 2 KEY PRESSED
AJMP NOTOK

NEXT1: MOV A ,P3
CLR C
SUBB A ,#11111000B
JNZ NEXT2 ; 8 KEY PRESSED
AJMP OK
NEXT2:
AJMP MAIN

;\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

EMPTY:
;CAGE IS EMPTY
MOV P1,#11110000B
AJMP MAIN
NOTOK:
;PART IS NOT OK
MOV P1,#10101010B

AJMP MAIN
OK:
;PART IS OK
MOV P1,#00000000B
AJMP MAIN


END

Duplicate post of http://www.8051projects.net/t65184/project-help/project-on-part-detection.htm! closing this topic.