Koryuu colours all messed up

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  • October 2, 2021 at 5:42 PM #49560
    Achelon
    Participant

      I bought a Koryuu to use with my OSSC and I can’t get it to work correctly with my Sega Megadrive 1 (which has a 32X and MegaCD 1 connected).

      When I do Sega Megadrive 1 CVBS output –> Sony monitor I get a perfect image. But when use the very same CVBS cable to the Koryuu + OSSC. The colours are wildly screwed up.

      A Megadrive RGB cable —> OSSC works perfectly.

      I have got the OSSC set on the right input (AV2 YPbPr).
      I have connected the component connections correctly,
      I have recapped all the consoles.

      This would seem to suggest a broken Koryuu, but testing with a Megadrive 2 shows correct colours, though it is suspiciously flickery.

      Can anyone help me troubleshoot this?

      October 2, 2021 at 5:45 PM #49561
      Achelon
      Participant

        Examples of what I mean:

        (Normal) Composite output to Sony PVM:
        https://postimg.cc/CdsT3rpj

        (Broken) Composite output to Koryuu:
        https://postimg.cc/75pWGSyH

        October 11, 2021 at 5:35 PM #49696
        BuckoA51
        Keymaster

          What region is your Megadrive and are you running it at the native Hz? Does your Koryuu have the latest firmware?

          October 12, 2021 at 12:33 AM #49714
          Achelon
          Participant

            Region is PAL. Clock frequency is unchanged from stock and Koryuu firmware hasn’t ben changed and thus is v1.1.

            November 8, 2021 at 12:55 PM #50087
            BuckoA51
            Keymaster

              Best guess the colour carrier from the MD is not getting interpreted properly. Unfortunately the composite signal from Megadrive is known not to be too great. I would simply stick to RGB (I guess you want to try composite for proper blending of faux transparencies?)

              November 8, 2021 at 3:42 PM #50092
              Achelon
              Participant

                “I guess you want to try composite for proper blending of faux transparencies?”

                Correct – I know of no other solution for this problem.

                January 10, 2022 at 12:05 AM #51135
                Achelon
                Participant

                  I know it’s a long time after the last post – but just in case anyone else has this issue, the problem was traced to bad connections between the OSSC and the Koryuu.

                  February 1, 2022 at 7:27 PM #51636
                  BuckoA51
                  Keymaster

                    Thanks for letting us know!

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