Hi, I just commited a new revision to compile the code using QuartusII 15.0. Maybe it does not work anymore on 13.0. No features added/removed, just same old code. https://github.com/lfantoniosi/rgb2vga/commit/9d2f264a8bd6e32341c62d34d0eb8e5f1f2b5c2f Enjoy,