Tom: Sounds like the computer side of the cable needs the CTS signal jumper, or maybe the computer needs the rts signals turned off. Also check the 10 uh choke on the kio2. It is easy to open one if you accidently get a short. -- Phil Carter, WD8QWR QRPARCI #9986, CQRP #3 Fists #6514, FP #262 QCWA #32302