Here's a $29.99 solution: http://cgi.ebay.com/Edgeport-4-4-Port-USB-Serial-converter-EIA-RS-232-/400132344208?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item5d29bf0990 Works with OS's up through Win 7 64 Bit. Sends FSK fine without using EXT FSK. Dave Hachadorian, K6LL Big Bear Lake, CA