yes this should work fine, I use the same with my TvS board as well. I am not sure about wiring on Blast city but with JP1 jumper set to B, 5 buttons per player come from JAMMA connector.
*EDIT: Something like this:
I am having error code 1 on one of my naomi motherboards when installing DIMM boards (game carts work just fine though). I have two DIMM boards and both give me same error. Both of these DIMM boards work just fine on my other naomi motherboard. What could be issue here? I am using official SUN...
I am going to put my UltraSIMMs setup in Jasen's case, is it ok for the extra long Dipswitch cable to be just sitting on the motherboard ? or should should I tie it and tape to the top of the case ?