[MLConian]

I was thinking of getting RGB cables, but then I read some comments on Reddit where people used the Packapunch RGB cables on a PAL Dreamcast and still have the same issue. Other than that, RGB SCART cables are nearly impossible to find in the Netherlands.
I did manage to find another Dreamcast, and it actually has the very same problem. I was able to capture a video of Sonic Adventure 2 NTSC-U running on it. The same flickering band pops up on 60Hz PAL games, or anything that runs in full screen (I’m not sure Skies of Arcadia PAL actually runs at 60Hz, but it’s definitely full screen), but it was easiest to capture on Sonic Adventure 2.

I’m starting to think this is caused by the CSYNC signal if the video processor runs in PAL mode, because it’s supposedly gone on VGA, which uses VSYNC and HSYNC on separate pins and ignores the PAL/NTSC processing (according to the Dreamcast service manual I found) – but I have no means/skills to actually verify that. I do know, however, that the RGB cables still use the CSYNC pin (pin 10).

[MLConian]

If you want to stay original, you could try running your Dreamcast through VGA on your OSSC. You’d need to adjust the aspect ratio for correct output, but that shouldn’t be a problem for your OSSC. Some games don’t give output on VGA, so beware of that – most do, however, even some where it’s not printed on the box (Shadow Man and Soul Reaver for instance). The list of non-VGA games is quite short, although it does contain some classics. Alternatively, you could equip your Dreamcast with a GDEmu and patch non-VGA games to run through VGA.

As BuckoA51 states, it seems you’ve got a composite to SCART connector (most PAL consoles are shipped with that actually). While that does work on a TV, it doesn’t work on an OSSC as it lacks the hardware to accept composite in any form. You could get a Koryuu and hook that up to your OSSC, that way you can directly link composite and S-Video to your OSSC.

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