Red Noise in my image only with RGB

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  • April 6, 2017 at 1:02 AM #12241
    wryguy87
    Participant

      I’ve been using my OSSC for the better part of 3+ months and for the most part I’ve been really enjoying it. Component output on the Wii is basically perfect. VGA with a Dreamcast is great, though there are issues with the length of the image that need to be manually adjusted which will then impact other outputs such as the Wii.

      However, I just recently tried using the OSSC’s RGB output with a modified N64. The image is off, with a great number of random red dots. It sounds similar to an issue Adam Koralik described in a Youtube review.

      I’m wondering if anyone can offer input on this issue?

      April 6, 2017 at 11:36 AM #12249
      paulb_nl
      Participant

        VGA with a Dreamcast is great, though there are issues with the length of the image that need to be manually adjusted which will then impact other outputs such as the Wii.

        Thats why there are profiles.

        Does another device work correctly on the RGB SCART input or is it just the N64 thats not working? Which N64 RGB mod and cable are you using?

        April 6, 2017 at 3:44 PM #12251
        BuckoA51
        Keymaster

          though there are issues with the length of the image that need to be manually adjusted

          Both the Dreamcast and Wii are 480p (rather than 640×480 VESA) so that should really be the only manual adjustment you need there.

          April 6, 2017 at 5:08 PM #12259
          GameJon
          Participant

            I’d suggest trying a couple of different RGB-capable systems to rule out any issues with the OSSC.

            Have a go at adjusting the Video LPF setting, Analog sync LPF setting and (if necessary) you can try playing about with the Sampling Phase setting to see if that fixes anything.

            It could also be as simple as using a different SCART cable for the N64. Is it an NTSC or PAL (french NUS-001) modded console? NTSC ones can use sync-on-luma cables, whereas the PAL ones can’t (IIRC).

            April 6, 2017 at 5:10 PM #12260
            wryguy87
            Participant

              It’s an NTSC N64. Funtastic model with the newer RGB64 modification that works on all consoles. Tried two different varieties of RGB cable, which does include snyc-on-luma.

              I don’t have another RGB capable console at the moment, but that’s worth a shot. I could pick up a Genesis and get a cable.

              April 6, 2017 at 10:33 PM #12265
              marqs
              Participant

                Random red dots sound like digital noise. Have you tried 240p output of Wii/DC or other line multiplication modes than 2x?

                April 6, 2017 at 10:37 PM #12266
                wryguy87
                Participant

                  Didn’t notice anything unusual when using 240p test suite on the Wii. This issue seems pretty much exclusive to the RGB port best I can tell.

                  April 23, 2017 at 1:47 AM #12562
                  wryguy87
                  Participant

                    Alright, I’ve tested with a Sega Genesis I picked up and the issue seems exclusive to the modified N64. Is it possible this is a common problem for modded consoles?

                    April 26, 2017 at 6:38 PM #12601
                    BuckoA51
                    Keymaster

                      Not that we’ve come across I’m afraid.

                      May 3, 2017 at 5:42 PM #12712
                      Fidde_se
                      Participant

                        The red dots is digital noise from the vdc-nus or denc-nus chip due to having the cable from the chip to the RGB board being to long, shorten the cable as much as possible and it will go away.

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