Got an ATX 24 pin housing and pins in the mail today so I could finally assemble my adapter, as the old one I had was getting crusty. This time built to last 
I bought silicone 18AWG wires off ebay, which makes it soft and flexible. I used two wires for each 3.3V and 5V pin on the Naomi end, and hooked this up to a dedicated pin on the ATX side. This should keep voltage drop to a minimum not only in the adapter, but also all the way back to the ATX PSU.
4x18AWG should be the same as 1x12AWG, which should keep voltage drop to a minimum on both 3.3V and 5V rails.
I used a Hozan P-706crimper which worked great for the ATX side, and ok to passable on the JST-VL side.
Links:
Naomi connector: https://wiki.arcadeotaku.com/w/JST_VL
ATX connector: https://wiki.arcadeotaku.com/w/Molex_Mini-Fit,_Jr.
I bought silicone 18AWG wires off ebay, which makes it soft and flexible. I used two wires for each 3.3V and 5V pin on the Naomi end, and hooked this up to a dedicated pin on the ATX side. This should keep voltage drop to a minimum not only in the adapter, but also all the way back to the ATX PSU.
4x18AWG should be the same as 1x12AWG, which should keep voltage drop to a minimum on both 3.3V and 5V rails.
I used a Hozan P-706crimper which worked great for the ATX side, and ok to passable on the JST-VL side.
Links:
Naomi connector: https://wiki.arcadeotaku.com/w/JST_VL
ATX connector: https://wiki.arcadeotaku.com/w/Molex_Mini-Fit,_Jr.
