Getting a Naomi 2 Running without a cab using original power supply, Please help.

I just won an auction for a Naomi 2 Arcade system with Virtua Fighter 4 Cartridge, Sega IO board, Original power supply (Marked MP-22160B or is the last digit 8? Not sure). I wanted to know what would be required to get this system working at home without use of an arcade cabinet. The power supply is what worries me the most since unlike a pc power supply it just has a 3 prong thing at the end that looks like something that would plug inside a computer.

Controls will also be a big thing, from looking at forums, I have learned that using a neo geo controller (would probably go with the neo cd game pad) would be the easiest route, if anyone knows of a good guide for pinouts and what wires need to go where, please let me know.

I do plan to add a gd-rom system at one point to play the game I have had laying around for the past few months Lupin III The Typing, which I know can be played by wiring a dreamcast keyboard to the maple interface on the filter board and of course that gd-rom power splitter cable would be needed as well.

For now I just want to figure out how to get the system running at all. I will be connecting the vga to the same monitor I used for my 246 and the audio to my amplified speakers so neither of those would be a problem. Thanks in advance for any help and of course thanks for to anyone who had helped with the 246 earlier this year.

Below is a picture from the auction to give you an idea of what I am working with here.

 

That one is like a pc power sup, for the 3 cables is very easy to power up just find a connector and hook them up to a common power plug cable you can even use a pc powers sup cable just cut one end and join it will give power to the naomi.
The vga you can connect it to the monitor you mention for 32hz, the audio the same you don't need the amp if you have another amp.
Now for the controller you still need the I/O the pin out is the same as any jamma so you just need a jamma harness with the cables for the two players controller and solder them to a 15db connector to use the neo geo controller. But also you can create your own arcade stick controller is very easy to wire out.
For games like marvel vs capcom and capcom vs snk 2 you need the capcom or the sega ver.2 I/O to map 6 button the one you have just map 4.
If you want to use a gd-rom you need the power supply you have there.

Hope that helps.

Edit to add a pdf with the jamma pinout for the i/o
http://www.sega-naomi.com/resources/manuals/NaomiWD.pdf

 

Just wondering, how exactly do I wire the power cable? Do I have to cut off the 3 pin thing on the power supply and splice the wires with a normal pc power plug or is there some way to make an adapter so cutting/damaging the power supply is unnecessary.

Also, is there such a thing as a neo geo extension cable, so I can just wire that to the io and not have to mod the controller itself?

 

Ahhhh that's the one on eBay I was bidding on too! Enjoy it man

 

yes there is a neogeo extension but they cost around 15 to 30 bucks. If you find the connector for the psu you can make the cable and dont need to cut it. But most people just cut it and splice.

But you can also use this cable is the one I use because is 10ft and is the same as the neogeo extension.
http://www.ebay.com/itm/10ft-DB15-M...=US_Video_Cables_Adapters&hash=item4166796f5f

 

I will probably end up getting one of those cables for the controller. Just wondering, where would be the best place to get a neo geo cd gamepad? On ebay the only ones I see are like $50 or more which seams to be pretty high.

Any advice for constructing an adapter for the power supply, like where to get an adapter that would plug into the psu to wire the cord to?

 

All neogeo controller goes for ridiculous prices so you need luck to find one affordable. For the power supply I never used an adapter and I don't remember well the connector but I find something in jameco that you can check it now that you have the connector in hand.
https://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_495613_-1

 

I received the Naomi 2 a few days ago, cleaned the dust out of the system. I have the connector from the inside of a pc power supply with the wire tips stripped. I was thinking of jamming them into the 3 pin connector and electrical taping them into place to power the system then plugging a normal pc power cord into the other end. I figure this should get the job done. Does this sound like it would work? Just wondering before I do something that could potentially destroy this system.

 

the whole " jamming them into the 3 pin connector and electrical taping" doesnt sound like a good idea to me

 

Nor me. I would do some research to make sure you have the wiring correct, and then maybe temporarily tape them together for testing purposes. Once you're sure it's working, you should solder them together.

 

You don't solder power cables. Use terminal block or a proper connector. You can always make an adapter - whether it's worthwhile is another thing, of course!

Your comment about jamming the wires in reminded me of this:

 

Well, he has to solder something, whether it's an adapter or the cable itself. That's better than "jamming them" together, I think.

 

Absolute rubbish. You're supposed to crimp power connectors. And terminal block is a screw.

The suggestion to tape them together temporarily is not recommended. Going on to say "solder them together" as a permanent fixture is a dangerous recommendation.

Use correctly rated terminal block, unless you have access to Molex crimpers. It should ideally be properly fastened to a housing. Something like this:



This, on the other hand, is never a good solution for permanent connection... and you should not be doing this with mains cable!

 

I was able to power the system up, at first I got the good old IO board not connected to Naomi Board message. I connected my jamma harness to the IO board and my pc power supply to that (as I had with my 246 Setup) and the game came on. The only problem I am having is there is no audio at all in the game. I connected the red and white connectors to the line in on my subwoofer as I do with all my other systems and I don't even get the Naomi sound. Any clues? Could it be a dip switch?

Edit: Got sound to fully work, was just a dip switch setting, advertise sound. The only problem now is the game just seams to freeze randomly, I have no idea if the problem is the game or the board. Any clues how to troubleshoot this?

Edit2: Could the problem be my wires connected to the jamma harness, would the game freeze if the io board was not getting the correct voltage for a second or something?

 

Why don't you just get JVS I/O instead of Ancient JAMMA? It has possibility to even add wheel and guns...

I made ATX to JVS conversions myself so I can play in my TV. It's very easy, here is example video: http://www.youtube.com/watch?v=a7WvfItC5sM

 

If you connect the power supply directly to the naomi you don't need power from the jamma. Also the naomi use more power just if using the dimms and the gd rom other than that is just the 5v, the 12v is for the sound amp from the jamma.

 

The jamma IO board needs power or the system does not detect it at all and displays the io board is missing message and will not even get into the game. Is there any way to power the io board without power from the jamma harness, or would a different io board be ideal?

Which would be the best, and where would be the cheapest place to get it?


Edit: Every once in a while it fails to boot the game and displays "spr <0C02C0DE>" in the top left corner, any clue what that means?

 

Find a capcom I/O or a Sega V2 and you are release from those problems.


This picture show what I'm telling you about the power from the naomi, you need the power cable that connect from the naomi to the I/O. Check the important notice.

 

Just wondering, where on the Naomi does it connect to the I/O board using that 5 pin connector? (is it somewhere on the filterboard?)


Would powering issues to the jamma harness explain the spr <0C02C0DE> errors (in top left corner on black screen) randomly and the random freezing or could that be something else?

Side Question: what is that third plug on the Naomi power supply for that does not fit in the Naomi filter board? (its too small)

 

Yes it connect to the filterboard. If that power supply is a naomi dedicated is for the GD rom the extra wire. For the error I really don't know what could it be, if you could find another cart test it and check if it does the same problem. Also check the bios and reseat them.