Nintendo RGB Bypass Amp (Revision 4.1b) + Super CIC ++ CSYNC

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  • November 29, 2024 at 7:15 PM #64208
    BlackSwanRetro
    Participant

      Hello,

      I purchased both these kits from VGP and have installed the Super CIC ++ into a PAL 1 Chip 01 SNSP-CPU-1CHIP-01. I removed R28 and ran buffer csync to Pin 3 on the multi out from the CIC board. I now want to install the rgb bypass and am womdering:

      1. Can I use the buffered csync from the CIC as it is currently setup with the rgb? In this case I would.just bypass the rgb lines and not hook up cysnc to the rgb board
      2. Do I also need to remove D1? It says this is optional to isolate pin 3 In the cic install docs but says I should do it in the rgb bypass docs
      3. Why are the 3 resistors for the brightness fix removed from the RGB bypass board? It seems still need to do this fix so why remove them?
      November 30, 2024 at 10:47 AM #64219
      BuckoA51
      Keymaster

        As I recall, the answer to #3 is because SNES consoles vary too much, so you should, ideally, use a scope to find the correct values when choosing your resistors. https://github.com/borti4938/SNES_RGB_Bypass/blob/master/README.md#brightness-and-ghosting-issues

        November 30, 2024 at 11:11 AM #64221
        TheCorfiot
        Participant

          Good morning

           

          Answers to your questions

           

          1. Yes this is the way, dont double buffer or you will delay csync timing

          2. Yes remove it

          3. See VGPs response

          December 4, 2024 at 1:55 AM #64309
          BlackSwanRetro
          Participant

            Thanks, just got the board and getting into the install now. For the RGB bypass install what is the deal with replacing R18 with the 75 ohm resistor? Should I still do this if I am taking buffered Csync off the Super CIC and not the RGB bypass? It seems like the CSYNC voltage is controlled by the jumpers on the mod boards, so what is the deal with R18 on PAL consoles?

            December 4, 2024 at 2:15 AM #64310
            BlackSwanRetro
            Participant

              Having a look at the Super CIC ++ docs:

              “You can also connect the buffered output to pin 7 (for use with sync-on-luma cables). Just remove R19 instead of R28. Same if you want to wire the buffered output to pin 9 (for use with sync-on-composite video cables). Just remove R18 instead of R28.
              In both cases, close SJ93 for proper signal attenuation.’

              So it seems like R18 is connected to composite video out on Pin 9. Not sure how replacing this relates to csync on Pin 3, but I am getting the impression that I do not need to use the replacement resistor with the super CIC cysnc out. Can anyone help?

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