do a search for MX880 graphics.  The 780 is nearly identical.  you need to have a piece of software to extract the .vfd file, then add your graphics to that file, and zip it back up as a .vfd.  all the info is in the mx880 thread and the link to the software should be there too.


actually, come to think of it, that might just be for doing custom backgrounds.  if you just add your .png file to the proper folder, it should show up.  i can check my work laptop on monday.