:After serveral trys to implement a 4 bit Interface to an HD44780 driven 2 x :16 LCD display I desperately seek some help. If you do not mind doing some actual coding yourself, the thing you need is HD44780 manual. Now, fortunately, it is online. In http://www.hea.com/hean2/lcdc/hd44780list.htm at Hyundai pages you can find a rather complete manual for HD44780. Notice the initilaization procedure, you need at the beginning. You need that to set the 4-bit operating mode! For 4-bit interface you need 7 lines: Enable, Register Select, Red/Write and Data lines 4-7. Initiation of the 4-bit mode is described in the "Initialization: By Instructions" link and 8-bit data is written over the 4-bit interface with most significant nibble first. -- Lauri --- For more info.