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PostPosted: Fri Jul 14, 2017 10:10 am 
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I'm not sure if this is the best place to ask this question, but since this forum was linked to from the install doc, I'll ask here.

I did an install following these instructions. https://etim.net.au/nesrgb/installation-famicomav/ I hooked up the palette switch using the Improved, Off (original video), Natural configuration.

The output on Off works fine. I'm guessing it's not using the RGB chip at all in this case. The other 2 settings will give me a black and white screen; just those 2 colors and no gray.

I'm using a SNES composite cable.

Anyone have an idea of what might be wrong? Is something in the installation messed up? Do I just need a different cable? Speaking of cables, what cable is optimal for this install? I have composite, component and scart capabilities.

Here is what it looks like. http://imgur.com/a/eLSSC

Any help would be greatly appreciated.


Last edited by narshe on Fri Jul 14, 2017 1:21 pm, edited 1 time in total.

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PostPosted: Fri Jul 14, 2017 12:05 pm 
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Joined: Sun Apr 13, 2008 11:12 am
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Location: Seattle
I would tentatively guess that your connection is bad between NES PPU pins 14-17 as the NESRGB board. (edit: fix garden path sentence)

Maybe. Not certain.


Last edited by lidnariq on Fri Jul 14, 2017 12:52 pm, edited 1 time in total.

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PostPosted: Fri Jul 14, 2017 12:22 pm 
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You think the NES RGB board is bad? Is there a way to test this? Could it be some solder joints are bad something?


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PostPosted: Fri Jul 14, 2017 12:50 pm 
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Location: Seattle
I really don't know.

If you looked at the composite output of the 2C02 when the NESRGB is active, you'd see white where all background tiles are, and black for all non-transparent sprite pixels. Which isn't actually what your screenshot shows.

Gimmick's start screen uses sprites for START and CONTINUE, using palettes 4 and 5 and using all three colors in both. (Does it change, or just stay white?)
The logo is palette 0, the floor is palette 3. The logo contains text and anti-aliasing that should be colors 1 through 3 (and the floor is similar), but only what was color 0 (black) remains visible, as white. Every other color becomes black.

In any case, I'd still assume a connectivity (soldering) error... Any of pins 1-21 between the mainboard and the NESRGB, or between the NESRGB and the PPU, could be to blame.


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PostPosted: Fri Jul 14, 2017 12:54 pm 
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Could the cable be the problem? I'm using a composite cable. Would that even work for this? I currently don't have a snes csync cable to try with it, just a luma cable.


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PostPosted: Fri Jul 14, 2017 1:00 pm 
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Location: Seattle
I don't know.

You had to wire it up to the jack, so you could test connecting NESRGB Component Y or S-Video Y to your monitor's composite input. A correct greyscale image should appear if you do so...


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PostPosted: Fri Jul 14, 2017 1:20 pm 
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I got it working!!! I was reading up on csync because I have SNES luma sync cables that don't work, and this is hooked up for csync. I thought I'd give the HD Retrovision SNES cables a try, and they work perfectly. The image is ridiculously crisp.

Thanks so much for helping me work through this issue.


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