Neo Geo MVS Big red 4 slots

[kazanova225]

So I'm finally getting around to finish my neo geo big red restoration.
I have noticed something weird about the coin mechs.
I can add coin in player 1 and player 2 however not matter how many coins I have in either side
let says I have 5 coins in player 1 and 0 player 2, I cannot coin up player 2 and vise versa.
unless I add coin for that specific player I can not use the coin I have in player 1 to bring up a character for the second player in Samsho for exemple.
none of the dip switch are on, and the board has the latest Unibios.
What could be the issue ?

 

[Neo-Alec]

Are you looking at the LED displays on the cab for the credits? Check all the connections to the credit LED's.

 

[Ape Cosplay]

Isn't it BIOS/region related?
I think I remember the US BIOS uses separate credit counters for each player while EUR/JAP uses a common one.

 

[lithy]

Maybe a slight language issue but your question isn't quite clear. Is it the game or the cabinet LEDs or both that won't add a credit to one side if the other is already coined up?

 

[Kujako]

Pictures might help identify the subject of discussion...

 

[nauman]

Isn't it BIOS/region related?
I think I remember the US BIOS uses separate credit counters for each player while EUR/JAP uses a common one.

I would agree with this one. If you are running the system with US region, the coin system is not shared between players and hence giving the effect you are describing. Since you are running Unibios, just change it to match your desire, which most likely is Europe.