I completed the web page that describes how to modify your AT91SAM7S256-EK to bring all three serial ports to the two external connectors. You can find the web page by going to
formatting link
and clicking to the Resource page. Then scroll down to Projects and the first link is the conversion web page. Let me know what you think. The images are mostly 1024 x 1024 and have a lot of detail. They may load pretty slowly on dialup.