Question about SNES sync drop

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  • March 3, 2021 at 12:02 AM #45647
    paulb_nl
    Participant

      are the resuls with Analog STC LPF set to 0.5MHz (SDTV)?

      Yeah I have tried changing every sync setting but there was no improvement.

      Also, could someone take a picture of the LM1881 circuit built into the cable? If it’s not done properly (e.g. missing termination on input), it can do more harm than good

      On pictures the cables with sync stripper on the SCART end don’t seem to terminate on input. Here is an example: https://www.retrogamingcables.co.uk/image/catalog/EU-8%20CSYNC%20SCART%20with%20LM1881.JPG

      With the Universal SNES cable I measured around 75 Ohm to ground at the console end of the cable.

      March 3, 2021 at 12:57 PM #45650
      Michal Stepien
      Participant

        I’ve just got Otaku’s CSYNC PAL SNES cable (also with lm1881 board) and the problem is exactly the same. Loss of sync happens exactly in the same moments like in the case of RGC CSYNC PAL SNES cable.

        March 9, 2021 at 10:39 PM #45754
        Michal Stepien
        Participant

          I can confirm that LUMA SYNC PAL SNES cable from RGC works like a charm with OSSC and 1CHIP PAL SNES.

          March 11, 2021 at 11:00 PM #45787
          dojima
          Participant

            Sorry for the somewhat off-topic question, but is the SNES sync issue that presents with some displays just a problem with SCART or does it also happen with composite and s-video? Considering getting the Koryuu, but if I would just have the same issue anyway, I’ll go with something like the RetroTINK instead.

            Thanks.

            March 16, 2021 at 8:05 PM #45919
            Harrumph
            Participant

              Yes the sync jitter is by design at the PPU level, so it affects all outputs (in 60 Hz mode). In fact, it was intentionally created to decrease composite video artefacts.

              March 16, 2021 at 8:37 PM #45921
              Michal Stepien
              Participant

                Actually since I have Luma SYNC scart cable now and it works both with OSSC and Retrotink, I can focuse on image quality. Maybe my TV has shitty scaling of 576p (that is what Retrotink produces in case of my PAL SNES) but 720p (line3x) made by OSSC looks much better. 720p from OSSC looks like output from Batocera (emulation) on RPI3.

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