Flipped screen on a Jamma game?

Vongoosewink

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Hey gang,

Got a question here, hopefully someone can help. I've got a Jamma cab that I'd like to be able to run 'Gate of Doom' in, but when I hook up the board, the game is upside down.

I know about the dip switches -- I tried flipping the dip to flip the screen, but it is still the same. And I've tested about 2 dozen other games on this cab, they all display correctly.

Thinking the Gate of Doom board might be jinxed, I pulled out my OTHER Gate of Doom board, and still the same thing -- upside down, even when the dip switch is flipped. So I tested the Gate of Doom in another cab (set up for Konami 4-player), and it displays correctly.

Anybody have an idea what is going on with this? I'm stumped. I know you can hack the back of your monitor to flip the screen, but I don't want to have to do this (the idea is to be able to swap games out of this machine, but this one just doesn't seem to want to work.)
 
Yeah, still the same.

I don't understand why flipping the dips gets no result on 2 different boards. Am I missing something?
 
Are you sure you're flipping the correct switch?

I have seen DIP switches fail before though. I once had a Twin Eagle board that would always display upside down, regardless of the switch. Turned out to be a bad switch - I jumpered around it so I could play it, but then I wished I hadn't. Twin Eagle is a terrible game.

-Ian
 
Are you sure you're flipping the correct switch?

I have seen DIP switches fail before though. I once had a Twin Eagle board that would always display upside down, regardless of the switch. Turned out to be a bad switch - I jumpered around it so I could play it, but then I wished I hadn't. Twin Eagle is a terrible game.

-Ian

It would be weird if the switches on BOTH boards failed though, and it displays correctly on the Konami-cab. Could it be something up with the cab or harness? That would explain why I get the same reaction from both boards.
 
You sure the other cab doesn't have the monitor set up to display the other way? That would explain why it works ok in that cab. I've got a couple PCB's that displayed upside down in a friends JAMMA cab, but they didn't have a dipswitch to flip the video :(
 
I'm pretty sure this is the monitor, lt looks like it was set up upside down for some reason. Maybe it came from Australia! :-D

The boards were part of it, the dips didn't flip the screen until I switched ALL the switches -- maybe I didn't get them flipped all the way?

Anyway, thanks for the input guys!
 
There are two sets of dip switches on the Gate Of Doom board. Normal video is Dip Switch 1 - switches 7 on 8 off. Flipped is switches 7 & 8 off

If you switched the ones on Switch block 2 you turned continuation mode on and attract mode sound off. Which wouldn't be apparent right away.

ken
 
I'm pretty sure this is the monitor, lt looks like it was set up upside down for some reason. Maybe it came from Australia! :-D

The boards were part of it, the dips didn't flip the screen until I switched ALL the switches -- maybe I didn't get them flipped all the way?

Anyway, thanks for the input guys!

It's funny, I had a Gate of Doom in a converted Taito cab that had the monitor installed upside down. I don't remember what chassis it was but it looked like the ones put in the Dynamo cabs in the late 80's/early 90's. The frame was cut so the back door would close.
 
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