The glcd library is an extensive modification of the ks0108 library. It now supports more chips and is easier to integrate with different panels. The graphical functions are backwards compatible (except where noted) so existing sketches should work with little or no modification to the code. The configuration mechanism has been changed to facilitate use with a broad range of GLCD chips and ATmega controllers so the configuration information will need modification to work with the new library.
Migrating Configurations
Sketch Migration
Deprecated ks0108 Functions