I built a sim cord for my Futaba T6XH using a old "AT" computer keyboard cord, If you hold the plug with the ground notch on the bottom, break out the 3 pins on the left, and 1 pin on the far right, the only pin left will be the 4th pin,
Used an Ohm meter to check what wires I needed, and tested it out, It wasn't necessary for "me" to jump out the 2 other sockets,
now I'm learning how not to crash my new heli, for only 1.50$
I also got the parallel connector from the old AT mother board,
I hope this can help some one out,,

heres a completed pic of the cord

Which pins did you connect to the parallel connector? Did you need to use a diode?

goto the FMS home page and u will find detailed info on how to make the cable, My local radio Shack said that the connector is no longer being sold by radio shack, So that is how I made my connector.
FMS home page http://n.ethz.ch/student/mmoeller/fms/index_e.html

heres a how to on the cord
http://www.net-express.com/nexus/fmsinterface.html

I also purchased the Com port cord. I just got it in the mail. It was 32$ and came with the FMS program. Also came with more models than the other version of FMS. I made the Parallel port because I was inpatient.