Cinematronics Brix arcade game Jamma adapter that we made years ago to test Brix circuit boards on our Jamma test bench.
Note that this one doesn't look to be completed: It looks like the player inputs were never wired up. The wiring is there from the Jamma side, but will need to be routed to the Brix connector side. We have include some extra pins to complete the build.
Also note that you will need a Jamma fingerboard to mate this to your Jamma harness or test rig.