Sega-Naomi

Over the last 6 months, I collected all the parts necessary to get a working Naomi 1 GD-ROM system. I got a Supergun in the mail today, to tie me over until i get an actual arcade cabinet (preferably a Taito Egret II if I can find one somewhere).



I decide to hook everything up to test it. Everything is hooked up as in the beginner's guide by maxchainsplendid, but with the Naomi and GD-ROM unit hooked up to an external PSU.



The game (Ikaruga) boots up and looks like it would play, but the I/O board seems to have a few issues... idk whether it's my I/O board or my supergun:



1. Video doesn't output via JAMMA, no matter where I set the resolution dipswitch. It won't view on my TV. Video is fine when I connect it to a standard LCD monitor, however.



2. Controls don't work. I've used 2 different USB cables fwiw.



3. Audio is fine. Went into the test menu to confirm that.



4. The machine doesn't detect the I/O board, as found in the test menu.



I hope I've posted sufficient information. Perhaps someone here could help me? =]

The Capcom I/O is powered by the JAMMA harness, and by what you are telling, it seems like the Capcom I/O does not get any power at all..?



Make sure your supergun provides sufficient power to the Jamma harness, perhaps just measure it using a multimeter.

I figured that would be the problem. Everything points to that, actually; I neglected to mention that the Naomi mainboard doesn't power on through the I/O board either.



I should probably run one more test without the GD-ROM attached to see if it works, but in the event that it doesn't, what can I do to increase power? Should I simply swap out the fuse? Or rather, *should* I be increasing power and just hold out 'till I get a cabinet instead?

No, changing the fuse will not do anything (other than potentially harm your system ).



A hunch; check if the JAMMA connector is connected like it should (ie. not upside down).

Negative, Ghost Rider. There's a small node put in place to keep me from turning it upside down.



Also, yeah, good to know on the fuse. This supergun would probably work out better for, say, neo-geo and cps2 stuffs.



Looks like I need to track down a candy cab or two.

Carcinogen wrote:Negative, Ghost Rider. There's a small node put in place to keep me from turning it upside down.



Also, yeah, good to know on the fuse. This supergun would probably work out better for, say, neo-geo and cps2 stuffs.



Looks like I need to track down a candy cab or two.

I suspect you do not have a multimeter (or simple probe) to measure if there is really 12V and 5V on the JAMMA harness? Or somebody that can help you with it?

Not in my immediate vicinity, no.



But in the event that I did, and the voltage didn't match up, what would be my next move?

Carcinogen wrote:Not in my immediate vicinity, no.



But in the event that I did, and the voltage didn't match up, what would be my next move?

most superguns have the ability to tweak these voltages. Check for (small) potentiometers at the back, or at the rear of the supergun.

There's a big yellow button. That's the only other switch on it there is, besides the power switch.

Do you have a manual for the supergun? These potentiometers often are quite small, about 4-5mm in diameter. How is the supergun powered? External power supply, or an internal one?