Naomi Setup

Alright, I just got this stuff in the past 2 days, and I cant figure out how the hell it works. Ive been working on it, but even with searching sega-naomi.com forums i cant figure it out. Im probably gunna sell this and wait until I find a cab for it locally unless I get it working soon. What you see is what you get, including the mainboard, powersupply, audio amp,sega i/o board, among countless other wires and stuff for a cab. Also included is 1 DOA2 cart. The bios is revision E i believe. A Japanese manual for it will also be included.

 

I had a Naomi setup much like yours and could probably help if you want. It looks like you have everything you need to hook it up.

How are you hooking it up without a cab? A couple of problems come to mind if you are trying to do a cab-less install. First, not all computer VGA monitors can accept the signal from a Naomi system. Why, I don't know. I do know that people have hooked a system up to an arcade VGA monitor with no problems, but then couldn't get it to run right with a regular computer monitor. The other thing that I seem to recall is that even if you do get it hooked up and running, the system may refuse to boot if you do not have any controls connected. I have not tried this personally, but I would imagine that this is simple to overcome by making sure the USB cable is connected between the motherboard and the I/O board.

Here's how I had my system wired up:

 

Alright, ill try that in a bit. Im trying to use my Supergun right now, so ive tried both my TV and 2 monitors. Ill play with it more in a bit.

 

I found the thread over on the Sega-Naomi forums and took a look at it. There is one other thing that I had a problem with that you might also be experiencing. The power supply that came with my setup did not supply a +5v line. This line needs to be present to both the Naomi motherboard through the molex connectors AND the JAMMA harness as the Sega I/O board also needs the +5v line to function properly. When I first hooked it up without it, I got the fans to spin on the board, but no video/audio/game. It sounds like this might also be the problem that you are having. Also, make sure that only dip switch one is on. The others should always be off.

The only other suggestion that I can come up with if the above doesn't work, is to pull and reseat the BIOS chip (just be careful with it).

 

Does the PSU need a seperate power input? I cant find a clear answer on it :\

 

I'm not sure what you mean by a separate input. If the PSU that you have is a completely functional (i.e. it has both the 3.3v and the +5v lines coming out of it), then you should only need the power it supplies. In other words, you plug that PSU into the wall, run the plugs to the Naomi board and connect the ground/+5v/-5v/+12v wires to the JAMMA harness (pins 1-6 & A-F). In this case, you would be completely bypassing any PSU which you had in your supergun.

You can use both PSU's at the same time; one to power the JAMMA harness, and the other to power the Naomi board. Just make sure that they are both plugged in.

 

See, Theres no plug to plug it into the wall, i think thats where im running into issues heh. How do i make a cable for it, theres only one plug left on the PSU.

 

That would definitely be a problem. It's hard to tell, but looking at the pictures, it looks like you have wires coming out of both sides of the PSU. Do the wires connecting to the two Naomi molex connectors all come from one side? If that is the case, how many wires are coming out from the other side (maybe a black, white and green wire)? If there are three, I would say that is your power input.

 

Yep, and the black white green goes to a part or two, then has one seperate piece that doesnt connect to anything. Thing is, its three pins, and my power cords are two. Do i just mod one to fit?

PS. Thanks for helping, the naomi people are useful sometimes though heh

 

I'm a little confused about the pins part. The black/white/green wires should be bare ended or going into a single connector with no other wires going into it. To properly power it up, you must use a grounded three-prong power cable. The easiest thing to do is to take a spare computer power cable, cut off the molded end (keeping the wall plug end) and splice/connect it to the PSU. For safety, I would use a surge protector too, in case it blows up. :smt083

 

Let me go take a picture of it quick

 

Heres that part of the power supply *other part goes straight to the MB of the naomi

 

I think that I have an idea of how it is hooked up, but correct me if I am wrong. In the first new picture, is the yellow/black wire is connected to the heavy black brick (isolation transformer)? That white/green/black connector should *in theory* be what you need to splice in the wall plug. I make no gaurantees as I haven't seen that type of PSU before.

 

Yep, it goes to the brick thing. Any clue how i should splice it? Which goes to which? heh thanks

 

Well, if this were a full (and properly wired) arcade machine, the hot line (from the wall) would come into a line filter (not strictly needed though), run through an on/off switch and into a power distribution block. From the distribution block, the power would normally be split and go to both the isolation transformer (the brick) and the PSU. The isolation transformer conditions the power line and feeds the monitor. Since you are using a supergun, you shouldn't have an isolation transformer at all.

What worries me is it looks like you have multiple white/black pairs coming out of the PSU. Just to be sure, can you tell me where each of these wires are coming from/going to:
- In the first picture, the white/black/green (three plugs).
- In the first picture, the white/black (two plugs).
- In the second picture, the white/black (three plugs).

Since the PSU needs a ground coming into it, it should be the white/black/green cable going into the PSU that the wall plug needs to be connected to. You have a couple of choices in splicing. You can do a pure splice: cut off the connector, strip the wires and twist the appropriate pairs together. You might, however, want to try Radio Shack and see if they have a matching molex style connector.

Oh, and I think that it goes without saying that I take no responsibility for accidents, or if this just causes something to blow up :smt082

 

Going to nothing:


Ground pin thing?


To the power supply:


To the brick

 

I think that I've got it now. I didn't realize that they were all the same "Y" cable. The unconnected end (with two white/two black/one green going into the three-prong connector) is where the power was going in. From there, it was being split between the power supply (white/black two prong connector) and the isolation transformer (white/black/green three prong connector), leaving a loose grounding cable (green with ring connector). Here is what you need to do to get the power working:

- Disconnect the isolation transformer (brick). You do not need it for your setup. Just let the connector remain loose.
- Connect the loose grounding wire from the Y cable to the ground on your supergun.
- Ground the Naomi PSU.
- Splice/connect the wall line to the five-wire/three-prong connector.

As far as the grounding is concerned, there should be a ground wire traveling through all of the controls. Sometimes there are multiple wires which all go to a screw terminal that seems to be in the middle of nowhere, sometimes it is a single wire loop. Connect the ring terminal to the ground. If there is a loose ground wire on the PSU (from either side), you can also just connect that to the ground in the supergun. If there isn't, just run a wire from the metal PSU casing to the ground.

That should just about do it.

 

Alright, just to confirm, i should be using the standard PC type power cable? Which way goes which? heh

 

the best sales thread ever. man i been watching this thread all day. What happened next.

 

It started as a sales thread dammit ><