Connection question - power cable splitter

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 6:59 pm

OH AND BY THE WAY....

I don't care what the main page says.

DO NOT TRY TO POWER AN ENTIRE GDROM SETUP OFF OF THE CAPCOM I/O's POWER!!!! Thats the most retarted, n00b suggestion I've ever heard, and I honestly think it should be revised... but who cares what I think hah.

Cranking your 5v to the max and running the naomi *might* work for a couple of hours, but I can PROMISE you that you'll burn out either the Capcom I/O, motherboard, Dimm or GDRom.

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 7:45 pm

billd420 wrote:Hey- hooking up the Naomi GDRom is super-easy. Just make sure to do the following:

Naomi RCA Cables (red and white) to capcom I/O

Naomi USB JVS Cable to capcom I/O

Jamma edge harness to capcom I/O edge connector

Square JST power plugs from Sun PSU to Naomi power plugs

SCSI Cable from Dimm to GDRom

Sun PSU AC power to ac outlet (White/Black = neutral/hot, green = earth ground)

Not sure on your GDRom cable, but there are two types. Both should be compatible with your Sun PSU (assuming its not hacked).

If you have the splitter cable, plug the two square JST power plugs from the Sun PSU into the splitter, then splitter to Naomi. You should be left with one single row JST power connector for the GDRom

If you have the GDRom Power Cable (not splitter), you plug that directly into the female connector coming off of the sun PSU. Its the middle connector pictured below, if I'm not clear in the description.

http://www.sega-naomi.com/pics/segapsu.jpg

Assuming your sun PSU is un-hacked, everything should be plug and play.

Hope that helps!

Bill

Hey Bill,

I'm good with 90-95% of this, but my only question pertains to the PSU to mobo power connections.

There are three connections in that picture.

The big 8-pin connector goes to the big 8-pin connector on the mobo. I got that part.

The slightly smaller 6-pin JST connector can connect to the Naomi mobo, but my question is, does it have to? Without the GD rom drive, I currently don't use that connection.

The third/smaller 6-pin connector could be used for a GD rom cable. I know that as well.

I just want to be sure before powering it on that I don't need to have two power cables running from the PSU to the mobo.

Thoughts?

Thanks,

Steve

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 7:52 pm

If you are using a Capcom I/O you don't need to worry about using the PSU for motherboard power, just the GD-ROM itself. :smt020

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 8:28 pm

DJ Infinity wrote:If you are using a Capcom I/O you don't need to worry about using the PSU for motherboard power, just the GD-ROM itself. :smt020

I've been told more than once not to connect the Capcom I/O to the mobo when using the PSU to power the GD rom drive.

Is that what you mean?

Or, are you referring to the 6-pin JST on the PSU to the 6-pin JST on the motherboard not being needed because the JAMMA powers the Capcom I/O?

Just a little unsure of what you mean.

Thanks,

Steve

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 8:33 pm

I would recommend using JUST the Sun PSU when powering a GDRom drive.

While it may work running the naomi off of the Capcom I/O's power converter, and the GDRom off of the Sun PSU, the voltages won't be exactly the same. The capcom I/O might put out 5.01v while the sun PSU might be on 5.12v. Different power sources, as well as voltage fluctuations *may* cause complications.

Its best for the electronics to use one or the other power source, not both.

And yes Steve, that is correct about not needing the secondary 6pin square plug. I'd recommend using it to split up the voltage load, however its not 100% needed. If you trace the pins with your multimeter, you'll see that all the 5v and 12v and GND lines in the 6 pin connector are tied to the bigger 8 pin connector.

So you clear on hooking up the GDRom now? If you're not, I can snap a picture or two of my set.

-Bill

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 8:42 pm

Orrimarrko wrote:
DJ Infinity wrote:If you are using a Capcom I/O you don't need to worry about using the PSU for motherboard power, just the GD-ROM itself. :smt020

I've been told more than once not to connect the Capcom I/O to the mobo when using the PSU to power the GD rom drive.

Is that what you mean?

Or, are you referring to the 6-pin JST on the PSU to the 6-pin JST on the motherboard not being needed because the JAMMA powers the Capcom I/O?

Just a little unsure of what you mean.

Thanks,

Steve

From what I have picked up being around forums is you CAN NOT use the Capcom I/O to power BOTH the motherboard & GD-ROM drive. I personally do not see the problem with the extra supply just to power the GD-ROM. The Capcom I/O can still power just the motherboard. :smt020

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 8:50 pm

DJ Infinity wrote:From what I have picked up being around forums is you CAN NOT use the Capcom I/O to power BOTH the motherboard & GD-ROM drive. I personally do not see the problem with the extra supply just to power the GD-ROM. The Capcom I/O can still power just the motherboard. :smt020

Powering the Naomi 1 GDRom with JUST a capcom I/O will not work.

Powering the Naomi 2 GDRom with JUST a capcom I/O will work, however you need to max out your 5v rail on your power supply. This is not recommended as you WILL strain your power supply, capcom I/O and Naomi. The parts are made to accecpt 5v DC, not 5.5v+.

Powering the Naomi motherboard with the Capcom I/O and the GDRom with the Sun PSU is not a good idea. Mixing the two different power sources will more than likely cause complications and pre-mature hardware failure.

I mean do what you want, I'm just giving suggestions. Its your hardware that can potentially be ruined, not mine.

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 8:53 pm

delete

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 8:55 pm

billd420 wrote:I would recommend using JUST the Sun PSU when powering a GDRom drive.

While it may work running the naomi off of the Capcom I/O's power converter, and the GDRom off of the Sun PSU, the voltages won't be exactly the same. The capcom I/O might put out 5.01v while the sun PSU might be on 5.12v. Different power sources, as well as voltage fluctuations *may* cause complications.

Its best for the electronics to use one or the other power source, not both.

And yes Steve, that is correct about not needing the secondary 6pin square plug. I'd recommend using it to split up the voltage load, however its not 100% needed. If you trace the pins with your multimeter, you'll see that all the 5v and 12v and GND lines in the 6 pin connector are tied to the bigger 8 pin connector.

So you clear on hooking up the GDRom now? If you're not, I can snap a picture or two of my set.

-Bill

I think I am, but pics are ALWAYS appreciated.

I'm definitely a visual person, and I'm still not very familiar with all of the voltage talk yet.

Thanks,

Steve

OldFoo · Post by **OldFoo** » Tue Sep 09, 2008 9:01 pm

It is mentioned earlier that when using the Capcom I/O, you do not need a separate power supply. This is NOT true when using the GD-Rom upgrade. The I/O converter does not supply the N1 motherboard and the gd-rom unit with enough power, due to slight internal power management differences between N1 & N2.

That is taken from the main site. It doesn not say that having an extra supply would ruin anything. I don't see how this is possible. So If someone more knowledgeable could explain this to me it would be appreciated (Andy, Josh, Or Grant) :smt020