If it is a Jrok Multi then you need to make an adapter harness since James no longer sells them.
It connects the Jrok to the original boards.
Here is a link to a wiring diagram to help you out. Page 6 has harness adapter info.
http://jrok.com/hardware/wsf/sys_fpga_guide_v11.pdf
The other option is to just use the Jrok with a jamma harness and switcher instead of the originals.