Generic 4:3 vs 256×240 optim

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  • March 11, 2021 at 11:35 PM #45790
    Michal Stepien
    Participant

      I have 2012 43′ Samsung TV FULL HD.
      Console is SNES PAL 1CHIP
      Cable is RGC SCART PAL Luma on sync
      I use line3x

      and that is is the issue:
      in 256×240 optim picture is amazing but aspect ratio is off a little bit — that is 1.5
      in Generic 4:3 AR is 4:3 but there is slight jitter — you can see it only if you are just at the TV.

      Changing sample phase does not help. Did any one have such issue? Maybe 1.5 AR is fine? Is here anyone
      with CRT and SNES PAL and eg. Super Mario World willing to take picture to show what is correct AR?

      March 13, 2021 at 12:05 PM #45833
      Harrumph
      Participant

        256×240 optimised can only be integer scaled, therefor AR can never be correct in this mode. You can see the multiplication factors here (bottom of page): http://junkerhq.net/xrgb/index.php?title=Optimal_timings

        For reference, AR of SNES visible area should be 256/224 * 8/7 = 1.306122449

        To reduce jitter in generic mode, try toggling TVP H-PLLx2.
        http://junkerhq.net/xrgb/index.php?title=OSSC#Allow_TVP_HPLL2x

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