> "The screen is red on real hardware, this is verified, although some monitors glitch
> out and strip all red from the image instead. (this happens whenever background
> colours are used on CPS1 games with said monitors)"
>
> Do you have any information on how this happens? As someone that used to do repair on
> arcade monitors, I don't understand how this could happen aside from the game PCB
> itself having a defect that kills the red output only for that scene.
>
> Since you mentioned this I pulled up several real PCB videos of this game, and the
> only one I've found so far with red background had other PCB glitches happening. All
> others had black. It does make more sense that way since if you look at the corners
> of the 3 game selections have black instead of red, assuming to blend with the
> background.
Charles Macdonald (and at least one other person) did some tests on the hardware, if you look at the screens where it's black then all the red gets sucked out the image after a few lines, often creating a weird gradient. Hooked up to a capture card, it produced the expected red.
You can see the problem here at 1:16
https://www.youtube.com/watch?v=UiJeLfruoh4
instead of rendering the red the entire red from the image gets stripped away, it effectively subtracts the background colour instead of rendering it. different monitors will do this in different ways, some only doing it after a certain number of lines. there are other games where you basically end up with invisible scenes because of this behavior, so it's clearly not meant to be stripping the colour like this.
We've seen the same with some Semicom boards and others.
I'm not a hardware expert, but apparently it's some kind of design flaw with the signals being generated that some screens react badly to and others don't. There was some mod you could apply to fix it to work with all screens.
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