Magewell and monitor read passthru as wrong resolution

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  • June 22, 2017 at 7:50 PM #13414
    HDL
    Participant

      I’m trying to output the proper Genesis signal and ratio (overscan included) at 348×240 using the optimized mode. My monitor and Magewell capture both read passthru as 720×240. If I use line x2 with optimized mode, I get a correct 696×480. Is there a way to pass the correct native resolution and ratio with passthru?

      June 22, 2017 at 10:09 PM #13415
      Mythic
      Participant

        Try switching the HDMI/DVI setting under output. That worked for me.

        June 22, 2017 at 11:01 PM #13416
        HDL
        Participant

          Switching that changes the output from 720×240 to 1440×240.

          June 22, 2017 at 11:14 PM #13417
          Mythic
          Participant

            Whoa, no idea then.

            June 23, 2017 at 6:41 AM #13418
            marqs
            Participant

              You can use Adv. timing to modify default 240p mode parameters, but 348×240 output may not work well/at all because:

              a) Sampling rate will be very low, possibly resulting to jitter
              b) DVI/HDMI interface specifies min. 25MHz pixel clock which won’t then be achieved even with 2x pixel repetition

              Switching from HDMI to DVI TX mode only makes pixel repetition implicit which is why capture card recognizes full width in DVI mode.

              June 23, 2017 at 12:11 PM #13422
              HDL
              Participant

                I see. I went and tried it anyway but as you figured, it didn’t work. So I suppose outputting the pure native resolution of old consoles is just not possible here? That’s rather disappointing. Seems like 696×480 is the next best thing (to maintain integers).

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