I've connected a Hitachi 44780 LCD to a 16F84 exactly the same way as shown in the manual's page 94(pdf version).

This is my program:
DEFINE LCD_DREG PORTA
DEFINE LCD_DBIT 0
DEFINE LCD_RSREG PORTA
DEFINE LCD_RSBIT 4
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 3
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2

TRISB.0 = 0
PAUSE 2000
LOOP:
LCDOUT $FE,1,"hello"
PORTB.0 = 1 'LED on
PAUSE 500
LCDOUT $FE,1
PORTB.0 = 0 'LED off
PAUSE 500
GOTO LOOP
END


When i tested it, the LED blinks but the LCD displays black boxes instead of "hello". HELP!!!! I've been trying to solve this problem for weeks!!!!! btw, i'm using PBP v2.40