Sync question before purchase

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  • #25326
    Homerjs1
    Participant

    I’m looking to buy, h have a question regarding scary sync on an N64 with RGB mod, model 1 megadrive through 32x with RGB scart and pal Saturn with speed and region mod running through RGB scart.
    With all of these on my current display, the picture shifts to the left and scans off screen.
    Will the ossc fix this issue?
    N64 is NTSC all others are pal

    #25327
    nmalinoski
    Participant

    If all three of those consoles have their image shifted left off the screen when connected directly to your display, I’d be inclined to say that there’s an issue with your display or its configuration. Does your TV have any kind of image centering controls, and, if so, have you verified that they’re not set all the way to the left (or equivalent) on the RGB SCART input?

    If you don’t have any centering controls for the SCART input, even in the service menu, and your display’s HDMI inputs don’t exhibit that behavior, then using the OSSC to simply digitize 15kHz/SD content (and line-double if your display doesn’t support those modes over HDMI) would sidestep the issue by using a different input.

    Cheap SCART to HDMI converters, like the ones you find on Amazon, would also sidestep the image centering issue, but they will not understand 240p, so they may introduce interlacing artifacts and add a little bit of lag.

    #25330
    Homerjs1
    Participant

    There is no option for centering.
    From what I understand it is because the leads are using c for sync rather than Luma.
    I was wondering whether the ossc can handle this and output without the shift.

    #25331
    Homerjs1
    Participant

    As an addition, it is only these consoles. The SNES, Dreamcast and GameCube all function properly on the same input.
    The consoles also all function properly on my CRT

    #25333
    nmalinoski
    Participant

    The OSSC can take all of composite video, luma, and clean composite sync as a composite sync signal and shouldn’t have the screen centering issues.

    I still think it’s weird that only these consoles are having issues, when the Dreamcast is ostensibly also using clean composite sync, unless you have an aftermarket SCART cable that’s, weirdly, wired for composite or luma.

    Do you know if you have straight-through SCART cables for your Genesis, Saturn, and N64? I know the Genesis and Saturn output TTL (5Vp-p) sync, but your TV is expecting 75Ohm (1Vp-p), so the SCART cables for these systems need (per RetroRGB) a 470 ohm resistor and 220uF capacitor on the sync line, meaning a cable without components will be insufficient. The N64 RGB mods are capable of TTL by bridging solder on a jumper. (PAL SNES doesn’t output clean composite sync, so that SCART cable is probably wired for either luma or composite video.)

    #25335
    Homerjs1
    Participant

    Thanks for getting back.
    The cables for these are after market and all have a label on the scart head that has a tick box with c sync or Lima sync. That all have the tick in c sync. They are quality cables and have all been fine until I decided I would like to use them on the 4k TV (hence the interest in ossc)

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