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No Sync Intellivision

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This topic contains 11 replies, has 4 voices, and was last updated by  marqs 1 month ago.

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  • #17092

    grips03
    Participant

    Does OSSC need status RGB signal (pin 16) in order to work with AV1/RGBS selected?

    I have Intellivision with RGB connected to XRGB2. It displays fine on Sony TV.

    I switch to my Euro SCART cable and connect it to OSSC and OSSC says no sync. Same Euro SCART cable works with my Odyssey 2 console, so not sure what the problem is.

    #17096

    BuckoA51
    Keymaster

    No OSSC doesn’t need that pin connected. Those consoles definitely outputting RGB? (I guess yes since you said you had them working on an XRGB2 as well, but doesn’t hurt to check).

    #17250

    grips03
    Participant

    Yes, Intellivision is outputting RGB using RGB mod board. It syncs using Sony PVM or XRGB2, just not OSSC. Let know what to do. I have scope if needed.

    #17267

    BuckoA51
    Keymaster

    Did you try adjusting Hsync tolerance under Sync opt.?

    #17293

    grips03
    Participant

    Yes, just tried tonight. Same result. Anything else to try?

    #17547

    KylJoy
    Participant

    I have this same issue. My OSSC will not sync to my RGB modded Intellivision (AV1) but my Intellivision works fine on my xRGB-mini. I have upgraded to 0.79a. How would I know what to set the many menu Sync options to for the Intellivision? Any ideas?

    #17602

    marqs
    Participant

    @grips03 if you have a scope, could you probe sync output of the mod board and take a capture of vsync (typically 3 scanlines) and some lines before and after it? You could also try increasing HPLL pre and post coast to 3 or 4 in sync menu to see if it helps.

    #17662

    grips03
    Participant

    I tried HPLL pre and post coast at 3 and 4. Still no sync.

    I can take picture of sync signal. Is there a certain spot to take picture of? I have Rigol 1102E.

    #17668

    marqs
    Participant

    Just use pulse trigger with “wider than” function on the negative pulse to lock to vsync.

    #17991

    KylJoy
    Participant

    Below is a picture of my RGB modded Intellivision’s sync pulse on my ancient oscilloscope.

    I set the scope so that the vertical was .5v per CM (between each line) and 0 volts was at the bottom

    Here is a picture of the calibration on the scope:

    calibration

    Then I set the time (horizontal) to 5 uS while looking at sync signal:

    Sync signal

    I am not an expert on video so please let me know what else it would make sense to look at.

    Thanks!

    #18070

    KylJoy
    Participant

    Anyone?

    #18078

    marqs
    Participant

    Your capture looks like horizontal sync signal. I assume that sync line is unloaded as it shows around 3.3Vpp. It’d help if you can redo the measurement with 75ohm load, preferably capturing vblank portion of the composite sync (like here) if possible.

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