Can the OSSC supports this slightly non-standard input signal

NewHome › Forums › OSSC, OSSC Pro and DExx-vd isl › OSSC – Discussion and support › Can the OSSC supports this slightly non-standard input signal

Viewing 5 posts - 1 through 5 (of 5 total)
  • Author
    Posts
  • August 9, 2025 at 5:27 PM #66785
    FrancoisL
    Participant

      Hi would the OSSC works out of the box, or can it be configured to work with the following input signal specification:

       

      Pixel clock: exactly 29.7984 MHz

      Vertical sync: 60 Hz with 550 µsec low during vertical blank every 16.7 msec

      Horizontal sync: 29.1 kHz with 10.2 µsec low during horizontal blank every 34.4 µsec

      Input resolution: 720 x 455

       

      Thanks in advance!

      Francois

      August 9, 2025 at 5:31 PM #66786
      FrancoisL
      Participant

        Additional info: the signal is TTL RGB 0-5V

        August 10, 2025 at 10:26 AM #66788
        BuckoA51
        Keymaster

          Where is this signal coming from and what do you intend to do with it after digitising it?

          August 10, 2025 at 3:32 PM #66791
          FrancoisL
          Participant

            The signal is from an old HP computer the very rare hP9845C. This is what you get if you built the RGB board. As for the type output from the OSSC, I don’t care as long as it is standard resolution. Could be as low as 720×480. Or 1024×768 would be nice.

            August 11, 2025 at 9:25 PM #66803
            marqs
            Participant

              At least you need a conversion circuit for RGB which is supposed to be video level (0.7Vpp). Ossc is able to digitize the specified ~485 line signal but you need a display which can show 720 x 455 (or its 2x multiple) properly. For conversion to a standard resolution OSSC Pro or another more featured scaler is required.

            • Author
              Posts
            Viewing 5 posts - 1 through 5 (of 5 total)
            • You must be logged in to reply to this topic.