Big Red - Not Able to Start a Game

[TheSegaDude]

Hey guys,

I need some advice as to where to start looking.

When I boot up my Big Red 4-slot things look normal. I'll see the Neo Geo splash screen, first game will start in attract mode and then cycle to the next game and so on.

Both Player 1 and Player 2 buttons don't appear to work. Nothing happens when I try to start a game.

But I can enter the UniBIOS (4.0) 'In Game Menu' by holding A B C and pressing player 1. Pressing A B C does nothing but it should bring me to the main 'UNIVERSE BIOS Menu'.

I have a spare 4-slot motherboard and I installed it and I'm getting the same behaviour.

What do you think is going on?

Thanks.

 

[Neo Alec]

ABC must be held at power on or during a reset to access the menu. If you're stuck in MVS mode, you'll need to coin up before you can do anything.

 

[TheSegaDude]

ABC must be held at power on or during a reset to access the menu. If you're stuck in MVS mode, you'll need to coin up before you can do anything.

OK, you got me sorted. It was in MVS/Arcade mode. I don't know how it changed from home/AES mode. So that is why player 1 and 2 weren't giving me credits.
I had forgotten that you need to hold A B C while powering on to get into the UniBIOS. I setup home mode a long time ago and don't really use UniBIOS for anything else.

Thank you Neo Alec!

 

[Neo Alec]

MVS mode is the default, so if it was set to home mode but then went back to MVS it means your board doesn't have a battery that was able to keep the setting for that long.