Unfortunately, Randy does not know what the connector is either. I suppose if you owned one, and you broke the cable, your only option would be to buy the whole board over again.
Not that they break at all, but that wouldn't be the only option. We have some cables in reserve for any such occurrences.
Thanks, Randy -- he ordered two cables from you (one to replace a broken one, actually, but it was from a second hand Turbo Twist). I am glad you have them now -- when we wrote you about this a few months ago, you didn't have them available separataely.
If anyone stubmles across this post, what we are working on is a TRON control panel recreation, including overlay stickers and the proper size/tilt/etc. Groovy Game Gear's TRON handle, along with recreated artwork from other sources, go a long way in to making TRON playable at home with the same feel as the arcade.
I am doing my own interface for the controls, using an Arduino/Teensy type device, so there will just be one cable coming out of the device -- no need for two (like TankStick), or internal hubs and a mess of wires... So far, so good. Plus, the ability to toggle it to send out iCade commands so you could use it with games on an iPad or something (but not for the TurboTwist -- iCade is digital only, no spinner type interface).
I expect we'll post photos when it's all done.