I am trying to get a 4 Line 40 Character LCD Display to display characters but so far have been unable to do so. I have a couple of 2 Line 24 Character displays that I have working but I can't get the 4 line display to display any characters. I have read what little information I have been able to find but it has been of little help. The 4 Line uses 2 of the same controllers that the 2 line display uses ( all lines are common except for the Enable lines. I have set it up on the bench with jumpers and switches. Has anyoneinterfaced to a 4 Line display ??