There are two libraries in the zip file: GFib49.hp intended for the HP49/49g GFib50.hp intended for the HP49g+/50g The only difference between the code in the two libraries is the formatting of the 'Help' and the 'Version' screen text. The GFib50.hp just takes advantage of the larger screen size in the vertical direction ( 80 vs 64 pixels ). Until I get the coding to automatically adjust for this, there will be two versions of the library. The library available at HPCalc.org will be the GFib49.hp version until the coding is complete. JTC: August 15, 2009