Help requested for Naomi-Supergun connection

OldFoo · Post by **OldFoo** » Tue Oct 23, 2007 3:14 am

Hi, I just got a Naomi w/GD-ROM, power supply, and Capcom I/O. I'm using an NTSC TV with a Sigma AV6000 supergun to play the Naomi. However, the picture isn't showing.

I set everything up with the SCSI cable between the motherboard'm DIMM and the GD-ROM (a little loose on the GD-ROM end's right side) and the power supply connected to both the motherboard and GD-ROM. The power supply, motherboard, and GD-ROM all light up and their fans turn on.

I also have audio, VGA, and USB cables running from the motherboard to the Capcom I/O with the Jamma side of the I/O connected to my supergun's Jamma harness.

Now, when I turn on the supergun and plug in the Naomi power supply, I can hear the startup tune to the Naomi but nothing ever shows up on-screen. The startup tune eventually loops and beeps but I haven't been able to produce any other sounds by pressing buttons on my arcade stick. I tried flipping up and down both the leftmost and rightmost of the 4 dipswitches to enable 15.7Khz but still nothing appeared.

Basically, I've hooked everything up exactly as the previous owner described and labeled but can't get a video signal (although the screen does distort a little at the startup). Is there something I'm missing or not doing right? If pictures would help, I can probably supply them. And if it helps knowing what I have in there, I'm trying to play Jingi Storm on a JP BIOS Naomi with the security chip installed. But again, I don't even see a Naomi startup screen (if there is one).

If my next step ought to be ignoring the Capcom converter entirely and just plugging the VGA cable into a computer monitor just for testing the graphical output, I can certainly do that. Any help is much appreciated.

OldFoo · Post by **OldFoo** » Tue Oct 23, 2007 8:22 am

I tried flipping up and down both the leftmost and rightmost of the 4 dipswitches to enable 15.7Khz but still nothing appeared.

Only Dpsw 1 will switch 15/31. The others wont do anything.

If my next step ought to be ignoring the Capcom converter entirely and just plugging the VGA cable into a computer monitor just for testing the graphical output

I would do that too and checking voltage would also be a good idea.

I'm trying to play Jingi Storm on a JP BIOS Naomi with the security chip installed.

Would you mind giving me the serials # on the disc & ic ? That sure wouldnt help solving your problem, but you would help completing our serial list

OldFoo · Post by **OldFoo** » Tue Oct 23, 2007 4:39 pm

Also, keep in mind that the Naomi must be switched off before changing resolutions. If it is changed while the Naomi is running, nothing will happen.

OldFoo · Post by **OldFoo** » Tue Oct 23, 2007 10:59 pm

EDIT: Looks like my Jamma cable just wasn't plugged in all the way on the graphics end so that it was able to output sound but not visuals. Silly me. Thanks for all the help!

BTW, on a supergun-related note, I get wavy horizontal lines on my TV using the supergun that depend on the game's audio (no audio cable connected = no lines, loud sound effects and music = lots of lines and distortion during that time). Is that a result of interference? If so, is it due to the audio cables, video cables, audio port, video port, and/or Jamma harness?

Anyway, here are the IDs on my Jingi Storm:

IC: 253-5509-5122J

CD: 271697

OldFoo · Post by **OldFoo** » Thu Oct 25, 2007 10:00 am

you have pm

OldFoo · Post by **OldFoo** » Thu Oct 25, 2007 7:43 pm

Ganelon wrote:BTW, on a supergun-related note, I get wavy horizontal lines on my TV using the supergun that depend on the game's audio (no audio cable connected = no lines, loud sound effects and music = lots of lines and distortion during that time). Is that a result of interference? If so, is it due to the audio cables, video cables, audio port, video port, and/or Jamma harness?

I got something similar when running a jamma pcb in my cab and there wasn't enough voltage. The amp circuit uses more current when louder sounds are going through it, taking current away from the rest of the pcb. You would see the same thing on a battery powered radio when the batteries are partly used and the display or lights flicker depending on the sound (especially low-end/bass sounds).

OldFoo · Post by **OldFoo** » Thu Nov 01, 2007 3:11 am

Thanks for the help. It wasn't a voltage issue though; it turns out that the lines were the result of interference from the sound cable. By replacing it with a more expensive aluminum coiled sound cable, everything became good.