Check this article, it's in German but you can see the diagram. You can use it as a standard keyer or computer keyboard interface. Memories etc. can be loaded from the PC. The kit costs about $100 in Germany. http://www.box73.de/catalog/pdf/BX-008.pdf?osCsid=05616a1ced19ca0022a313a728 191e06 73, Bob WU5T/DJ0MBC