This is something I've been working on for the last couple of weeks.
I Got a New Astro Cab that has been running MAME (via ArcadeVGA/JPAC). I recently acquired a Naomi 2 setup for more modern games. I decided to get both of them installed at the same time, and use 2 switchers to select what system should run (DB25 2-way switch for controls, and DB15 2-way switch for video)
I purchased harness and finger board from JAMMA boards, and wired it all up. For the most part it works GREAT! I can now select what system I want to control/display, and I managed to actually get a full MAME setup + Naomi 2 setup (2 power supplies, and all!) inside a NAC!
To accomplish this I made the following adapters:
- 2 * JAMMA->DB25/DB15 (between Naomi and switchers + between JPAC and switchers)
- 1 JAMMA edge->DB25/DB15 (between NAC harness and switchers)
For DB15, you need to wire R,G,B, GND and SYNC
For DB25, I wired P1/P2 joysticks, P1/P2 buttons 1-6, Start 1, Start 2, GND.
Makes sense?