Reply To: OSSC for PCBs

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August 27, 2019 at 12:55 AM #27681
videogameperfectionrocks
Participant

    I think I have definitive evidence that the problem I’m having with Battle Garegga is an OSSC bug.

    The following settings display the full image but it is squashed vertically:

    Line5x mode 512×240 optim.
    Sampling phase 202 deg
    H. samplerate 432
    H. synclen 41
    H. backporch 46
    H. active 450

    Lowering h.active causes the OSSC to stop outputting an image at all, unless I increase h.synclen and h.backporch like this (although then about 25% of the image is cropped from the bottom and it is still squashed vertically):

    Line5x mode 512×240 optim.
    Sampling phase 202 deg
    H. samplerate 432
    H. synclen 75
    H. backporch 77
    H. active 320

    In both cases my 1600×1200 monitor reports it is receiving 1280×1200 resolution which should never be the case in Line5x mode:

    “With Line5x, horizontal active and mask are adjusted internally so that frame width of 1600 or 1920 (depending on “Line5x format”) is always generated.”

    http://junkerhq.net/xrgb/index.php?title=Optimal_timings#Horizontal_multiplication_factors

    Can we agree this is an OSSC bug?