I have to have the Panatwin powered up to run my Naomi i/o even though the Naomi m/b & GD-rom are powered from a seperate PSU. The same for System 246/256.
You probably need to ask the Type-X owners to confirm this
Thanks for confirming!
You don´t need to go further into details because I´m quite familiar with the Type X, but I don´t own a supergun for years, I just wondered if the I/Os need power. Actually, I don´t even plan to get a supergun, it was just a question that crossed my mind every now and then.
My Type-X setup involves a hand-soldered molex wire onto my JAMMA loom, which plugs into my JVS-to-JAMMA board. I hook up the molex on the loom to the Type-X power supply via a molex extension cord i've carefully lead out of the Type-X casing, and everything works perfectly. Ideally, I should probably put the I/O board in an enclosure and only expose the wires I need, but bah, humbug.
Here's a shot of the aforementioned molex wiring setup: