Dreamcast Flicker Issue – Fix

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This topic contains 4 replies, has 4 voices, and was last updated by  themrcul 11 hours, 4 minutes ago.

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  • #10021


    Hi there. Just got my OSSC and I’m absolutely loving it. I had a flicker issue with my Dreamcast, running through a Kuro VGA box on a Sony XBR55X810C and recently discovered the fix. Thought it might help others having the same issue: Navigate to:

    Sync Options -> H-PLL Post-Coast -> 1 lines (really anything more than 0 lines seems to help)

    This solved the issue for me and my Dreamcast looks beautiful running through the OSSC now. Hopefully you guys find this useful!

    • This topic was modified 1 week, 1 day ago by  amstrick17.
    • This topic was modified 1 week, 1 day ago by  amstrick17.


    Really odd that you would need this setting for the Dreamcast though.



    Yeah I thought it was weird too, but adjusting that sync setting fixed my issue.



    H-PLL coast settings should not have any effect in RGBHV mode as coast is internally disabled.



    Heya fellas,
    I found that my Dreamcast would flicker on default settings until I changed the “480p in sampler” setting to “DTV 480p”.

    For some reason after that the flickering hasn’t occurred anymore.

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