When I connected the FMS interface I built the other day to my new radio and the laptop I got a very jumpy signal. In the FMS Forum there where two different suggestions what might cause this, either to weak power in the serial port, or the reversed order of the signalcable from my Sanwa radio.
This guy had a similar problem but with another PIC interface, though for this one the source code is available. So maybe I will change mine to that one since the design was similar. Or just reprogram my PIC since I think the design is similar enough to do that, though I have to study it more carefully first.
Also the FMS Forum had a several posts on different hardware interfaces, maybe one can find a simple USB joystick based one there.
