Curiosity killed the cat, etc., but: I just installed the new K2 firmware that came with the KAT100. I found that my I/O controller was version 1.03, so I installed the new 1.07 I/O controller. Now...I have had an SSB adapter, NB, KAF2, KPA100, and other stuff and it all worked fine with the 1.03 I/O controller. What kind of changes did you make in three releases of I/O controller? Vic K2VCO