N64 RGB Amp 1.2b with NUS-CPU-02

[mroach]

I’ve just ordered the N64 RGB amp Rev 1.2b. I’m doing my homework on the installation before it arrives. The product page and installation instructions make mention of the -03 and -04 boards, but not -02. I examined my board and confirmed that the stock CSYNC components are installed and wired-up to pin 3.

Does this amp require removing the existing components to use buffered CSYNC? Or does the stock wiring do what’s needed and then I just leave J3 open?

As a point of comparison, I was reading the installation instructions for the Voultar amp which clearly says if you have have the buffered CSYNC wiring installed in your board, you don’t wire-up the sync cable or do anything else. https://voultar.com/N64RGB%20Installation%20Guide.pdf

FWIW this is an NTSC-J system, I’ve ordered an SNES NTSC SCART cable, and will use it with OSSC.

[BuckoA51]

Took me a while of asking around to find a definitive answer on this, but here goes:-

There is no problem with using the existing buffered C-sync on the n64 and as already stated by the OP, just leave J3 open on the RGB amp. I would advise that the scart cable has a 470ohm resistor on the C-sync line though. I don’t remember exactly what voltage the buffered C-sync on the N64 is but it has the same circuit as the one in the SNES give or take some slightly different resistor values so best to be on the safe side and add a 470 ohm resistor.

If the scart cable is not 470 ohm attenuated and for some reason it can’t be added or it is not convenient to do so then you would need to use the attenuated C-sync on the RGB amp instead, but if so don’t forget to disconnect the existing N64 C-sync cicuit by removing the 75ohm resistor and 47pf capacitor.

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