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RGB NES Loses Image

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This topic contains 7 replies, has 2 voices, and was last updated by  Fnnrqwin 3 months ago.

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  • #13834

    Fnnrqwin
    Participant

    I just got an RGB-modded NES frontloader (NTSC). The image looks great on the OSSC, but when playing Super Mario Bros. I have a problem. Every time the screen switches (between the current # of lives page, between underground and above-ground, between water and normal levels) the screen goes blank for a split second. The OSSC is not displaying any different information during those split seconds, so I don’t think the resolution or Hz are changing.

    Anybody else experience this?

    #13861

    BuckoA51
    Keymaster

    Make sure you’re on the latest firmware and try disabling “Allow TVP HPLL2x” (under Sampling opt).

    #13864

    Fnnrqwin
    Participant

    I’ve tried that (I’m keeping it off anyway) to no avail. It doesn’t happen every time, but the areas in which the video cut out happens don’t switch. It’s only in transition areas between levels or between parts of a level, just not every time those conditions are met. I assume this isn’t something just Super Mario Bros. related though, because I really doubt that game is skipped over by enough people on this forum to have not had this happen to them. So I’m assuming it’s something about the way the OSSC handles the NES. I’ve tried changing LPF settings, but those are not affecting this.

    It’s just enough of a signal cutout to force my TV to reconnect to the OSSC too, so it’s pretty hard to ignore. It’s short enough that the OSSC isn’t changing its light to red during that split second or displaying different information.

    #13868

    BuckoA51
    Keymaster

    No I’m definitely not seeing it here with Super Mario Bros on my RGB modded NTSC NES. Are you sure you’re on the latest firmware?

    #13873

    Fnnrqwin
    Participant

    Yes, I am. Coincidentally, using a SNES with the same settings produces no problems whatsoever. I’m going to try the LineX settings tonight, but 4x has worked great for all my 240p systems so far. I adjusted the LPF and coast settings but nothing made it more stable.

    #13883

    Fnnrqwin
    Participant

    Alright, everything is stable using Line3x and Line5x. It’s interesting that using 4x with my SNES gives me no trouble whatsoever. I would assume that the SNES being the most finicky system would be a good sign for NES compatability. I recognize this is a resolution issue, which means communication with the TV is obviously involved somehow, but I’m not really using a standard resolution for the NES or SNES inputs, so I’m surprised 4x on the NES wouldn’t work. Any ideas?

    #13886

    BuckoA51
    Keymaster

    Interesting… I can confirm I’m using line triple here, as my setup doesn’t support line quadruple.

    #15037

    Fnnrqwin
    Participant

    Welp, reviving this. With the latest firmware the NES runs in Line5x somewhat reliably.

    I have to start every game in 3x mode, but then I can switch the 5x mode and the image stays (only in 1600×1200 mode, not 1920×1200 or 1920×1080). However, certain games still drop out. Super Mario Bros. works perfectly, but Mega Man flickers. Both games display the same resolution/refresh data on the OSSC’s screen.

    Is there something that should differ between the two? Maybe that’ll help me figure out if there’s anything I can change or if it’s just my TV. I have a feeling it’s not the TV since the refresh rate should be the same between 3x and 5x modes.

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