"Warning - while you were typing a new reply has been posted. You may wish to review your post." eww... Hmm... According to the Label on your PIC, there should be MIOS on it. But if you have MIOS on your PIC, there should be a message saying "Ready." on the LCD, which is not appearing here. There are two things I would do for troubleshooting in this case: 1. Check the wiring of your LCD. Compare the CORE-schematics with the pinout of your LCD. Try to contact the supplier of the LCD and ask him what he can say about the strange typo in the datasheet. 2. Connect the Core to your PC (MIDI), start MIOS Studio and check if your Core is sending any Upload-Requests at startup. Then Check if there is a MIOS-Version installed on the Core. hope that helps edit: 4-bit mode is a good point, frailn. I haven't thought of that.