This document defines variables and registers for an LCD display and keypad input. It then sets up a password entry program that displays a prompt, reads 3 keys from the keypad, and checks if the entered keys match the password. If the password is correct it displays a success message, if incorrect it displays a failure message and restarts the program.

1. TRISB=0
TRISC=%11110000
DEFINE LCD_DREG PORTB
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 0
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 1
X VARBYTE
PORTB=0: PORTC=0
X=0
LCDOUT $FE, 1
LCDOUT $FE, 2, “INGRESE CLAVE”
LDOUT $FE, $C0, “-“
TECLA1:
GOSUB TECLADO: LCDOUT,”*”
IF X<> 1 THEN GOTO FALSO1
TECLA2:
GOSUB TECLADO: LCDOUT,”*”
IF X<> 2 THEN GOTO FALSO2
TECLA3:
GOSUB TECLADO: LCDOUT,”*”
IF X<> 3 THEN GOTO FALSO3
CLAVEOK:
LCDOUT $FE, 1
LCDOUT $FE, 2, “CLAVE CORRECTA”
LDOUT $FE, $C0, “PUERTA ABIERTA“
PAUSE 3000
GOTO INICIO
FALSO1:
GOSUB TECLADO: LCDOUT,”*”
FALSO2:
GOSUB TECLADO: LCDOUT,”*”
FOLSO3:
LCDOUT $FE, 1
LCDOUT $FE, 2, “CLAVE INCORRECTA”
LCDOUT $FE, $C0, “Reiniciando”
PAUSE 3000
GOTO INICIO
TECLADO
TECLADO:

2. LOW F1
IF C1=0 THEN X=1 : GOSUB AR: RETURN
IF C2=0 THEN x=2 : GOSUB AR : RETURN
IF C3=0 THEN X=3 : GOSUB AR: RETURN
IF C4=0 THEN X=”A”: GOSUB AR: RETURN
HIGH F1
LOW F2
IF C1=0 THEN X=4: GOSUB AR : RETURN
IF C2=0 THEN x=5: GOSUB AR : RETURN
IF C3=0 THEN X=6: GOSUB AR : RETURN
IF C4=0 THEN X=”B”: GOSUB AR : RETURN
HIGH F2
LOW F3
IF C1=0 THEN X=7: GOSUB AR : RETURN
IF C2=0 THEN x=8: GOSUB AR : RETURN
IF C3=0 THEN X=9: GOSUB AR : RETURN
IF C4=0 THEN X=”C”: GOSUB AR : RETURN
HIGH F3
LOW F4
IF C1=0 THEN X=”*” : GOSUB AR : RETURN
IF C2=0 THEN x=0: GOSUB AR : RETURN
IF C3=0 THEN X=”#”: GOSUB AR: RETURN
IF C4=0 THEN X=”D”: GOSUB AR : RETURN
HIGH F4
PAUSE 10
GOTO TECLADO
AR :
IF C1=0 THEN GOTO AR
IF C2=0 THEN GOTO AR
IF C3=0 THEN GOTO AR
IF C4=0 THEN GOTO AR
RETURN
END