willbot2000

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  • June 13, 2019 at 5:01 PM in reply to: Help! OSSC + Neo Geo MVS – No Video #26628
    willbot2000
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      I absolutely did not – my mistake. I also have my PVM in parallel.

      For the next revision of my board I plan to add a THS7274 or THS7376 which I believe will give matched impedance. Right now I’m running straight from the JAMMA edge, but attenuated through 500ohm pots (RGB and sync).

      June 12, 2019 at 8:11 AM in reply to: Help! OSSC + Neo Geo MVS – No Video #26596
      willbot2000
      Participant

        I can attenuate it down to 1v peak but then I also have to reduce the “Analog sync Vth” further.

        June 11, 2019 at 9:55 PM in reply to: Help! OSSC + Neo Geo MVS – No Video #26588
        willbot2000
        Participant

          Cracked it! Changed “Sync > Analog sync Vth” to 90mV. I’m guessing this is the voltage threshold for the sync pulse?

          I was checking the sync on my scope earlier and it was peaking at 1.3v.

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