Thanks @misteraddons! Yes, flipping the CHAMMA switch did the trick, pressing SELECT now brings up the menu. Everything is working perfectly now and my Neo Geo dreams have become a reality!Excellent, thanks for following up. Like Aurich said, the NeoGeo cabinets should have an adapter for JAMMA since they use stereo audio and JAMMA is mono. Can you tell me which JAMMA pin the “select” button is wired to?
If it’s MVS wiring then looks like it should be: “Select Up” = P1B5 and “Select Down” = P2B5. Flip the CHAMMA switch to on and give it a shot. https://wiki.neogeodev.org/index.php?title=JAMMA_connector_pinout
Can't wait for the second Mistercade and DE-10 to arrive so I can hook up my Big Blue and get all that Jotego CPS goodness too