Super Famicom and OSSC

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  • #21103
    igo12
    Participant

    Hello, I ran into a problem on my Sony TV Bravia 50w808c. When connecting to SCART RGB “Super Famicom” produces such a picture.
    Video Yotube
    I’ve tried different options for connecting the synchronization in the super famicom connector.
    3 contact – the picture is constantly shifted horizontally by a couple of pixels.
    9 contact – problems like on video.
    7 contact – Everything works, but sometimes the problem is like on the 9th contact.
    8 contact – no picture.
    I tried the 9th contact through the lm1881 circuit. The result was similar to using 3 contacts.
    I found another serious problem with the image lines moving apart:
    image
    I conducted checks on several TV effect as the pictures are saved everywhere but the problems like the video disappear. I still have PS1 PAL / NTSC, PS2 PAL / NTSC, Sega Mega Drive NTSC-J, Super 32x NTSC-J with them there is no problem with standard connection in SCART RGB.
    To solve this problem I want to buy OSSC but the information is very contradictory somewhere it says that the problem will also help in the erroneous translation of 240p to 480i and somewhere that does not help the problem with the frame rate famicom. Please tell me, will OSSC help in my case, especially with regard to the problem as to images with mismatched lines?

    #21104
    BuckoA51
    Keymaster

    Feeding the image directly to the TV means the TVs deinterlacer will be processing the picture when it should be handled as a progressive image. This can cause all kinds of problems. Will OSSC fix this particular issue? Probably, but remember SNES is one of the most problematic systems and you might need to fit a de-jitter board to your console too (https://videogameperfection.com/forums/topic/nes-snes-240p-audio-video-stability-issues-read-before-posting/).

    #21112
    Anonymous
    Inactive

    Is there an ETA on the dejitter board? It seems like it will be a nice upgrade, and I like upgrading my consoles. 🙂

    #21115
    BuckoA51
    Keymaster

    There’s about 5 being tested at the moment, just a handful of minor issues still being investigated.

    #21152
    igo12
    Participant

    Thanks for the quick response, I have new information my Super Famicom when outputting to 480i disappears the problem of dividing the lines in different directions at the top. I hope this information will help determine whether the OSSC will solve my problem with my TV.
    Modifying the console option is also interesting as the last chance I would like to not disassemble my famicom.

    #21174
    Harrumph
    Participant

    Looks to me like it could be related to the jitter issue, since it only affects the top half and then gradually corrects itself. Your observation on 480i output further strengthens that.

    However, the digital processing is probably different to the analog in, because I’ve never heard this is a problem on the Sony W series when running through the OSSC.

    #21197
    noodohs
    Participant

    The jitter mod is pretty much complete according to Marqs over on shmups: https://shmups.system11.org/viewtopic.php?f=6&t=61285&start=90. I’m getting one for my NES and my SNES, hopefully that will fix the audio issues I have with anything above line2x on those two consoles. All the others seem to work fine beyond that (except 480p x2 on my TV, for some reason).

    #21409
    Anonymous
    Inactive

    How can one acquire a dejitter board? My google fu may be weak. I see mentions here and on shmups about them starting to become available, but nothing clearly about “get them here”. Sorry if I’m being dense, any help appreciated.

    #21426
    Harrumph
    Participant

    Pretty sure VGP will have them for sale quite soon. What’s out there now is people DIYing it, and there was a group buy for parts/assembly in the shmups thread recently. You could try posting there if you are desperate.

    #21427
    BuckoA51
    Keymaster

    Yep we’re just waiting for the initial batch from the suppliers.

    #21428
    noodohs
    Participant

    That is awesome! I have some coming from the fellow in that thread. I am hoping that someone will put together an NES guide for it, specifically a toploader with an NESRGB in it. Those are the only two systems that don’t work in 5x on my TV and really it’s just the audio that doesn’t work, so I can’t wait to get them fixed.

    #21437
    Anonymous
    Inactive

    I’m just looking for a bare pcb. Marqs posted the mouser bom, which is extremely helpful, and im pretty confident I can diy it, with the exception of being able to fab a pcb. If anyone has a spare here, I am interested. I will ask at shmups also.

    #21439
    noodohs
    Participant

    There is a link in that shmups thread for an OSH Park file, you can get the PCB (well, usually a minimum order of 3) from them for pretty cheap.

    #21443
    Anonymous
    Inactive

    I didn’t find it in the thread, but did find it in the readme on github.

    https://oshpark.com/shared_projects/XwqVt6Gq

    thank you for pointing me in the right direction, noodohs!

    #21880
    igo12
    Participant

    Hello.
    I got my OSSC and it successfully coped with the problem. The super famicom picture became very beautiful.

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