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Issues with 'official' RGB modded N64

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This topic contains 6 replies, has 6 voices, and was last updated by  ShootTheCore 35 minutes ago.

Viewing 7 posts - 1 through 7 (of 7 total)
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  • #9883

    FelixK15
    Participant

    Hi guys,

    I got my OSSC last week and so far I’m quite happy with it.
    Works perfectly so far with my SNES and GameCube; however, my RGB ‘official’ modded french N64 is giving me some troubles :-/

    If I connect my N64 via the OSSC to my TV, the picture stays mostly black. Sometimes however, I’ll get a picture for a few seconds only for it to disappear again. A video of this can be found here: https://drive.google.com/file/d/0Bw00xmPmBX0-TGpUTVBrMTE1MFE/view

    While trying to find the cause of the problem I noticed that the OSSC LED-display was rapidly oscillating between “313p 49.83Hz” and “312p 49.99Hz”. A video of this can be found here: https://drive.google.com/file/d/0Bw00xmPmBX0-QWEyREIxcW9TSE0/view

    At first I suspected the RGB cable; however, the same cable produces a beautiful, stable picture when I connect it to my SNES.

    I then tried to connect the N64 via the OSSC to my PC monitor. There, I get a constant picture. However, the picture is pretty unsteady.
    Nothing you’d notice during gameplay but especially in menus this gets quickly annoying. I also made a video of this effect which can be found here: https://drive.google.com/file/d/0Bw00xmPmBX0-R0pvT2RSOVZQTVU/view

    Does anyone have any clues as to why this happens?
    Help is highly appreciated.

    #9929

    BuckoA51
    Keymaster

    It seems your N64 has an unusual sync signal. Can you tell me who modded it and which method was used?

    #9930

    marqs
    Participant

    Try setting H-PLL pre and post coast to 3, and then increase Hsync tolerance. Tweaking analog sync Vth could also help. Which cable do you use btw?

    #10198

    oursique
    Participant

    Hello,

    I was about the report possibly the same issue.

    My setup:

    – OSSC firmware 0.73
    – Optoma HD26 video projector (my only HD “TV” to try with)
    – Original RGB SCART cable from my SNES

    This is the setting that happily works with all of my retro consoles, at last the ones outputting RGB on the SCART of course. The cable in particular is being used with the SNES for a week, and the OSSC never failed me even after hours of playing.

    Now I have a Nintendo 64 NUS-001 (FRA) modded for RGB output. This is the actual modded console I bought, for technical details: http://www.ebay.fr/itm/182323687980 (it’s the French store but the seller is also using English).

    At first, I was afraid because OSSC didn’t output anything and my old CRT displayed a distorted picture. But the modder told me I had to cut a wire he installed for modern displays. Indeed afterwards my CRT displayed a sharp picture but still not the projector.

    Then I tried with a PC monitor and it worked, except for small loses of the picture, but anyhow the OSSC is outputting a picture.

    Now I’m trying to figure out what’s wrong with the projector it was intended for.

    At turning on the OSSC with default settings, I get the test screen and when I switch to AV1 input with the remote, sometimes I get the picture from the game, with correct colors but shifted somehow and “scrambling”. It’s very brief so I recorded it: http://dl.free.fr/s1ukKgCNU

    With default settings, the OSSC LED is green and the LCD displays: “AV1: RGBS 313p 15.62kHz 49.92Hz”.

    With the info button, it displays: “Vmod: 288p LO: 626 VSM: 0”.

    I followed your indications above and increased H-PLL pre and post coast to 3, even 5. I also increased Hsync tolerance by steps of 10 us until I reached the maximum. I also increased and decreased analog sync Vth. The projector is always like trying to find a picture and fails with “no signal”.

    The OSSC LDC displays the same information as with the default settings.

    I also tried the other options in the menu, restarting the OSSC to reset settings as necessary to avoid changing too many things at the same time and not knowing what could work.

    The projector only got HDMI inputs so I have to use a DVI-to-HDMI adapter. I guess it’s just a passive device joining electrical pins together.

    What could I also try? Except for “another TV”? 🙂

    Thanks!

    • This reply was modified 1 day, 1 hour ago by  oursique. Reason: spelling
    #10200

    oursique
    Participant

    By the way, I don’t think the projector is really that picky, because line triple mode works with it.

    #10228

    borti4938
    Participant

    Hey, I do have modded a French N64 with the same method…

    Modding work

    Unfortunately, I wasn’t my N64 but I remember that I have tested the work over the OSSC, too. It behaved as like as the other consoles on my TV set. So it might be your TV which has the problem…

    #10235

    ShootTheCore
    Participant

    I saw this exact problem with my RGB-modded N64 on my OSCC when I used a sync-on-composite EuroSCART cable (even though my launch N64 supports composite sync). Switching to a sync-on-luma EuroSCART cable cleared it right up.

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