Sega-Naomi

hi To everyone :smt006



i'm testing a Sega i/o rev A board with naomi 1 mobo and virtua tennis 1 rom board.



i tested the naomi mobo with capcom i/o and worl flawless but with sega i/o rev a get stuck (after naomi sreen) in a black screen with the message:



JAMMA I/O boards don't have enough switches of functions.



someone can get me running this sega i/o revA or tel meplease how/what mods i have to do for fix it?



thanks in advance.



Steve

hey steve!

i'm pretty sure this has to do with the switchs setup, i already saw this when i tried to play cvs2 with a sega io rev1, are you sure the USB cable is correctly set into the IO? also is the selection jumper ok? if i remember right there is a switch to select from A to B...

First thing you should check is to see that the system settings is set to one or two players and not 4 players. This 4p setting changes the max amount of buttons per player.



The Jamma I/O Rev. A does not have the A/B select switch. This is an option that was available on Rev. B. You may have to use a different I/O to get this game to work. The only modification for the Rev. A board I know of is to get rid of the counter, which will not help your situation.

ok i got it working.



what i've do:



up the voltage to 5,15 on original sega PSU (naomi power)



drop to 5.00V the voltage on cab PSU



switch the jumper to "A" position



connect power cable to I/O board







without one of these point the I/O don't work. :smt012



this is the I/O rev A (i think, the stiker say SP5002-A) picture:







it's very strange because REV.B I/O work flawless... :smt017





thanks to all for your help :smt006

joshua3dg wrote:The Jamma I/O Rev. A does not have the A/B select switch. This is an option that was available on Rev. B. You may have to use a different I/O to get this game to work. The only modification for the Rev. A board I know of is to get rid of the counter, which will not help your situation.

My mistake about the A/B select switch. I missed it the last time I looked.

glad you got it working!

footix wrote:glad you got it working!

Thanks :smt004

Hello all

a friend of mine has some problem with his naomi 2 and marvel vs capcom in its windy 2 cab

He gets the same error message as STV but the strange thing is that his naomi 2 is hook up in JVS (windy 2 is JVS standard) He also have a jvs to jamma in his cab but he told me it's not hook up

so i don't see why naomi tells him "jamma i/o ...."

so if there some one who know where the prob comes from just tell me ^^



thanks a lot

I've always found problems when the 5V is too low.



VT was a major problem initailly for me.



Is the N2 using a GD, and how is it all powered. Remember the GD will sap a load of juice too