It doesn't appear that you are initializing the LCD controller at all. There's a sequence that needs to be gone through. I've only done the 8 bit sequence, though. The "black squares on top line" is the classic "not initialized" indication from the LCD. Harold -- FCC Rules Updated Daily at http://www.hallikainen.com - Advertising opportunities available! -- -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist