Okay, I have made a few modifications according to some of your recommendat=
ions. =A0It all seems to be working in the sim. =A0The only thing left is t=
o test it in the real world. =A0I included some of the timer initialization=
 just to give a slightly better idea. =A0I was surprised how little the ext=
ra instructions have affected the runtime.

The port shadowing in particular is probably going to help the stability of=
 the design since there is a very real chance of noise on one of the inputs=
 from a remote sensor. =A0Thank you all for your suggestions.

#include p10f200.inc
; initial vars declaration, proprietary, etc. =A0You aint gonna see it.

BeginCountdown
=A0 =A0 clrw =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0; Ensur=
e our port is in the proper state
=A0 =A0 movwf =A0 shadow =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0; before beginn=
ing
=A0 =A0 movwf =A0 GPIO
=A0 =A0 movlw =A0 .2
=A0 =A0 movwf =A0 TimerW
=A0 =A0 movlw =A0 .252
=A0 =A0 movwf =A0 TimerE
=A0 =A0 movlw =A0 .47
=A0 =A0 movwf =A0 TimerH
=A0 =A0 movlw =A0 .245
=A0 =A0 movwf =A0 TimerL
Delay5m
=A0 =A0 nop
=A0 =A0 nop
=A0 =A0 nop
=A0 =A0 nop
=A0 =A0 nop
=A0 =A0 nop;e.avi

=A0 =A0 decfsz =A0TimerL,f
=A0 =A0 goto =A0 =A0Delay5m

=A0 =A0 btfss =A0 Beep,DoIBeep
=A0 =A0 goto =A0 =A0Delay5m.DecTmrH
=A0 =A0 movlw =A0 LED_MASK =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0; Sound a tone to=
 remind the user that
=A0 =A0 xorwf =A0 shadow,W =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0; the door is ope=
n.
=A0 =A0 movwf =A0 shadow
=A0 =A0 movwf =A0 GPIO

Delay5m.DecTmrH
=A0 =A0 decfsz =A0TimerH,f
=A0 =A0 goto =A0 =A0Delay5m

=A0 =A0 movf =A0 =A0TimerE,W =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0; Sound tone du=
ring 6/256 TimerE iterations
=A0 =A0 andlw =A0 b'11111000' =A0 =A0 =A0 =A0 =A0 =A0 ; Throw out the lower=
 3 bits.
=A0 =A0 xorlw =A0 b'11111000' =A0 =A0 =A0 =A0 =A0 =A0 ; Compare the upper 5=
..
=A0 =A0 btfss =A0 STATUS,Z
=A0 =A0 goto =A0 =A0Dec5m.DecTmrE
=A0 =A0 movlw =A0 1
=A0 =A0 xorwf =A0 Beep,f

Dec5m.DecTmrE
=A0 =A0 decfsz =A0TimerE,f
=A0 =A0 goto =A0 =A0Delay5m

=A0 =A0 decfsz =A0TimerW,f
=A0 =A0 goto =A0 =A0Delay5m 		 	   		 =20
--=20
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