some SEGA Jamma I/O PCB questions!!!!!!

OldFoo · Post by **OldFoo** » Sun Dec 02, 2007 4:22 am

Hi every one,I'm a newer with the sega-naomi.And now I met some questions,please help me!!

I got some sega Jamma I/O pcb,they look same but with different number.

I use "guity gear x" to try them and there is a problem:

I try the I/O with the number"SP5001-A" first:

In JVS Test it is perfectly:

In JVS Test---Input Test:

Then I try the second I/O number"SP5002-A" with the same game and the same cable:

In JVS Test it looks correctly:

But in JVS Test---Input Test,the "COIN" display"8000 8000" and I can't coin in the game:

Last I try the I/O number"SP5001-B":

It looks like no connect with the I/O board:

What can I do with the I/O board number"SP5002-A" and "SP5001-B"?

Please help me!!! Thank you

OldFoo · Post by **OldFoo** » Sun Dec 02, 2007 7:29 pm

This issue has been identified, and posted in the FAQ section. Sega Naomi I/O's will not work properly without connecting a coin counter.

I hope this helps!

OldFoo · Post by **OldFoo** » Sun Dec 02, 2007 7:52 pm

Add a +5Vline with a 100k ohm resistor to the meter lines, it works a treat.

OldFoo · Post by **OldFoo** » Sun Dec 02, 2007 11:51 pm

heheh always listen to what master geezer said :p

OldFoo · Post by **OldFoo** » Mon Dec 03, 2007 12:34 am

The 'resistor option' is always available, of course. I just can never seem to remember the resistor value. :smt110

OldFoo · Post by **OldFoo** » Mon Dec 03, 2007 12:50 am

heheh indeed worked fine to me :p

OldFoo · Post by **OldFoo** » Mon Dec 03, 2007 4:20 am

I just not see.

Would you please answer simply and clearly?

Why my"SP5002-A" I/O board display "COIN 8000 8000"?Is there any version and the compatible with the I/O board?

That is difficult!!!!

Help me.

OldFoo · Post by **OldFoo** » Mon Dec 03, 2007 4:46 am

So for the resistor value, it's 100k! On the Sega I/O post I made, it was 100, no wonder it didn't work! Awesome! Good luck w/your I/Os dude; are you understanding what everyone's telling you?

OldFoo · Post by **OldFoo** » Mon Dec 03, 2007 5:26 am

The I/O that shows as 'not connected' could have a problem with it. It might not be working. That or it was not wired with power correctly. The problem is not compatibility, but connection/dead issue. I'm not sure why you have 2 I/O, but just use the one that works. :smt045

Like what was mentioned before, these I/O will NOT work properly until the counter connection issue is resolved. Fist, connect a counter or 100k ohm resistor as mentioned, then your game will 'coin'.

OldFoo · Post by **OldFoo** » Mon Dec 03, 2007 5:40 am

Hi sir,Do you mean I would add a +5V line with 100k oum on the I/O board?

How and where to add it?

Are there all "SP5002-A"I/O board need add it?

Why "SP5001-A"I/O board do not need?

Why my "SP5001-B"I/O board display no I/O?Is it broken?

I'm now have just 10 naomi kit,some with capcom's I/O,some with "SP5001-A"I/O,these no problem,but some with "SP5002-A" I can't coin.The Input test shows 8000 8000.

I use the same cable,I don't know why 5001-A can coin but 5002-A can't coin.

what differences with the 2 I/O board?

5001-B I think it maybe broken,right?

Thank you all!!!!!!1