The file has been updated to fix a bug when using SYMBOLS=1. So if you already downloaded the file, replace it with the new one in the main post.
Do not p-mail me for help compiling my updates, ask on the board.
Do not request sound for your favorite game. I work on whatever, when I get around to it.
If you have schematics for discrete sound games not easily found on the net, I would be interested.