jamma to vga OSSC

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  • November 8, 2018 at 8:18 AM #23645
    TheBortot
    Participant

      Hi, since we dont have SCART conectors here, i was thinking about plugging an arcade pcb into OSSC by VGA video input. But do i need to attenuate the R,G,B and Sync signals?What resistors to choose?

      November 8, 2018 at 7:02 PM #23650
      nmalinoski
      Participant

        I’m not sure where ‘here’ is, but, if it’s the US, you can get console SCART cables from Retro-Access or Retro Gaming Cables, and you can get reasonably-decent male-to-male SCART cables on Amazon.

        As I understand it, people generally use Superguns for adapting JAMMA to SCART and/or DE-15 (which you probably know already since you mentioned SCART).

        If you’re going to hook up your board to AV3, I don’t think you need to do anything to the RGB lines, but you need to make sure that sync is TTL, not the 75Ohm you’d need for AV1/SCART.

        November 9, 2018 at 5:06 PM #23658
        Anonymous

          Maybe some info on what game or games you’re trying to connect would also be helpful. Is it something, like a NAOMI, that natively outputs VGA?

          Or, are you building a custom cable for the interface? Also, are you trying to split the signal, for (for instance) capturing through the OSSC, while playing on a cab?

          nmalinoski – isn’t game PCB sync output typically TTL? So, it really would be a simple direct connection for RGBS to a HD-15 the appropriate pins on AV3 (csync on pin13)?

          November 9, 2018 at 5:52 PM #23659
          nmalinoski
          Participant

            nmalinoski – isn’t game PCB sync output typically TTL? So, it really would be a simple direct connection for RGBS to a HD-15 the appropriate pins on AV3 (csync on pin13)?

            I don’t really have experience with arcade hardware, but if it’s TTL RGBS like an SNES, then yeah; you could slice off the end of any old VGA cable, attach R, G, B, and S to the screw terminals (Good luck making a connection with ground/shield, though), and AV3 should take it.

            The possible concern is if it’s not very-high-quality RGB output, like a lot of old home consoles. If that’s the case, it would be better to use a cable with components, or something like a supergun, to take advantage of the better low-pass filtering on AV1.

            November 9, 2018 at 6:25 PM #23663
            Anonymous

              (Good luck making a connection with ground/shield, though)

              You mean the shield on the cut VGA cable? Yeah, how exactly is the best way to bond to that? I’ve seen in my scart cables that they basically just pinch the shield against a ground point or ground wire, so it’s making constant contact, but it’s by no means mechanically attached.

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