Reddit reviews StarTech.com 0.5m Black Straight Through DB9 RS232 Serial Cable - DB9 RS232 Serial Extension Cable - Male to Female Cable - 50cm (MXT10050CMBK)

I've built my own version to plug into a PC. Its late on my end but I'll get the pin out and a pic of my example when I'm free tomorrow.

You'll need the following

• 1 DB9 Male breakout board ex: amazon
  
• 1 Zero Delay Encoder ex: amazon
  
• 1 DB9 MF cable (if you dont have the original one as well) ex: amazon
  
  Basically you connect a few lines from the zero delay encoder to the breakout board (I'll provide pin outs later). After you complete the wiring, you can now plug the breakout board to the pad and the zero delay encoder to the PC, map the buttons with Stepmania (or whatever you plan to use your pad on), and tada.
  
  Edit: Link to pic of my version & where to place wires. You only need 1 ground line (in this example its the white wire), hence all plugs have 1 wire coming out except the first one which has 2 wires. The black wires lead to the X & O buttons, the blue wires lead to the arrows. The thing the wires run through is a furrite core which is an optional addition.

>Finally, I hate that the CDX doesn't have standard controller port spacing. I like to use the Sega-brand wireless controllers, but they are incompatible with the CDX due to their receiver's form factor.

A couple of these could help with that. It wouldn't be pretty though.

I thought about trying something like this with my G27. I didn't want to take it apart so I was going to use this breakout board along with this cable. I just haven't gotten around to doing that.