Here’s a low cost, DIY solution for a custom cabinet adapter. This will allow you to convert your cabinet to the JAMMA standard with a little bit of wire and some soldering.
In this kit you will receive a 56 pin female edge connector for the JAMMA side, and a 44 pin cabinet conversion board. You supply your own wire, or as an option some can be included in the kit.
The conversion board has clearly labeled, large pads and holes that make routing and securing wires super easy.
Version 1.0: Initial design, currently available.