OutRun Deluxe Upright

gzsfrk

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OutRun Deluxe Upright - Horizon issue

Hello arcade gurus!

Well, it seems like I'm playing the gopher game here; I make progress on one front, and another problem pops up for me to figure out. I was recently having some sound issues with my OutRun cab (discussed in this thread) which I was able to successfully fix by removing, polishing the pins of, and re-seating all the removable EPROMs on my Rev.B PCB. Huzzah! I get to hear that lovely music in all its pristine glory again.

However, after re-assembling my cabinet I have now run into a NEW issue: the blue levels and vertical position seem to be malfunctioning. See the below photos:

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8JPfoZ0.jpg


LAQHUAB.jpg


As you can see, the "horizon line" for the blue sky in the background doesn't come down far enough. It still moves up and down as you crest hills or your view shifts downward, and you can still vaguely see the clouds against a white background, but before they were starkly contrasted against the blue sky. There also seems to be an issue with blue levels on the progress map screen as well, and maybe some general coloration issues during various stages.

These were all working perfectly before I pulled out the PCB to clean all the EPROM pins. Here's a video I recorded to demonstrate the now-fixed sound issue:



Now just to answer a couple of anticipated questions: yes, I'm all but certain all of the EPROMs and chips were replaced exactly the way they were when I removed them (with the exception of two which, if you'll read in the other linked thread, were incorrectly seated), as I did them each one at a time. And no, I didn't make any changes to the monitors color/brightness/contrast adjusters. The only thing that was changed was me unhooking all the connectors from the PCB, disassembling the top/bottom pieces, removing-cleaning-replacing all the removable chips, re-assembling the PCB, re-installing it in the cabinet, and re-attaching all the connectors.

I can't seem to find it now, but in the back of my head I remember reading about someone having a very similar (if not exactly the same) problem, but I don't recall what the resolution, if any, was.

Can you guys give me some guidance? I supposed I can disassemble everything and go through the remove/replace of all the EPROMs again, but I don't want to do that if the problem is likely to lie elsewhere.

Thanks much for any help that can be offered!
 
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Alright, let me provide some more information. Having watched demo mode for quite some time cycling through various backgrounds, I no longer think it's really an issue with the blue sky. I think it's the background horizon tiles themselves, whether the clouds on stage 1, or the mountains, or forest, or what have you. The sky colors themselves seem to display just fine, including the graidents on the later stages. I think it's a problem with the coloring (or maybe transprency value?) of the horizon background images. It's strange, though--some stages look very close to accurate if not perfectly so. But others you can tell there's some weird color issues going on.

Does that help any? I will take a video later when I can and post it so you can see what I'm talking about.

Thanks again for any suggestions, assistance, or guidance!
 
So I've played around with it some more and done some comparisions between what I'm seeing and videos of correctly working cabs on YouTube, and I'm pretty sure the problem is the colors in the horizon graphics tiles are either wrong or the transparency layer isn't working. See the below videos to understand what I'm talking about:


It's hard to make out, but the cloud horizon graphics are there, but instead of the area surrounding them being transparent and letting the blue sky show through, it's solid white.


Same here, except that the hill horizon graphics are much shorter than the clouds. And instead of the transparent area being white, they're blocked in as a greenish color.


On the mountain stage, everything almost looks okay, except that the trees in the horizon foreground, again the transparency layer isn't working like it should.

Does anyone know which chip handles the transparency layers? I'm feeling like that's where I should be focusing. Either that, or on the ROMs which actually hold the horizon tile graphic data.

Thoughts? Suggestions?
 
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