No Sync Intellivision

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  • January 29, 2018 at 3:33 PM #18816
    grips03
    Participant

      I think you need to adjust period in to show more signal. Like in marqs post above.

      February 1, 2018 at 12:00 AM #18884
      marqs
      Participant

        @KylJoy You should capture vblank section of the signal as well. As you see from above captures, hsync is around 5us so you’ll need to set trigger mode to pulse and (negative) width threshold e.g. to around >10us.

        February 1, 2018 at 4:02 AM #18891
        KylJoy
        Participant

          Finally got back to this. Is this helpful?

          Intellivision RGB Mod Sync Output:
          Vertical Sync

          NTSC Test Signal Generator Output:
          NTSC Test Signal

          February 6, 2018 at 6:03 PM #19056
          marqs
          Participant

            There are no hsync pulses around vsync which is likely to be problem – that’s something I’ve not seen with any other console. You can try increasing H-PLL pre and post coast values to 4 or 5 but I’m afraid that may not help if the digitizer doesn’t recognize the signal as proper sync.

            February 6, 2018 at 6:15 PM #19059
            KylJoy
            Participant

              I’ll give that a shot. Thanks for the info!

              February 13, 2018 at 2:40 AM #19258
              grips03
              Participant

                I tried that before and it did not work. Would it help to mail you a console?

                February 13, 2018 at 4:32 AM #19263
                KylJoy
                Participant

                  Yes, messing with those settings did not work.

                  There must be a way to get this to sync with the OSSC. What else can we try? Can the firmware be altered to accomodate this sync signal?

                  Thanks again.

                  February 13, 2018 at 10:42 AM #19266
                  BuckoA51
                  Keymaster

                    Who makes those Intellivision RGB boards by the way? Perhaps they can chip in, if there’s something wrong with the design they maybe didn’t realise at the time and it can be improved.

                    February 13, 2018 at 3:42 PM #19268
                    grips03
                    Participant

                      Bruce Abbott and Fred Kono make them. They both do the same thing. Both work to Sony PVM via RGB and other RGB to HDMI adapters. Just not OSSC. Both adapters provide RGB and composite sync.

                      February 13, 2018 at 7:33 PM #19271
                      marqs
                      Participant

                        Unfortunately there’s not much to be done on the firmware side if digitizer frontend cannot lock on the sync. TVP7002 sync processing path is a bit different when using digital sync inputs, so wiring the sync signal without termination to VGA input pin 13 and using AV3-RGBS might provide different results, but I wouldn’t have high hopes. It just seems that TVP7002’s robustness to very unusual sync signals is not on par with some other chips.

                        October 17, 2018 at 3:29 AM #23364
                        jboner1058
                        Participant

                          Was this ever resolved? Im in the same boat. No sync on the intellivision RGB Fred Kono board

                          October 17, 2018 at 5:41 AM #23366
                          KylJoy
                          Participant

                            Not for me.

                            October 17, 2018 at 10:11 AM #23367
                            BuckoA51
                            Keymaster

                              Has anyone tried contacting Bruce Abbott and Fred Kono directly?

                              October 17, 2018 at 7:22 PM #23373
                              KylJoy
                              Participant

                                I THINK I was able to get ahold of Bruce Abbott but it’s been a while. I think he told me that this was not his baby. I believe I became otherwise occupied after that but I’d love to have a solution for this.

                                October 17, 2018 at 7:32 PM #23374
                                KylJoy
                                Participant

                                  I found a reference to Fred Kono’s email of “fred at geemail” so I’m trying that now.

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