Snes Mini/ N64 RGB CSYNC

Thx for the feedback. I will check this.

 

Well I think I am long overdue for an update since I was OP, and then went MIA on the thread......... The mod worked fine with my revision N64 and the C Sync cable I linked works fine on both the N64 and SNES Mini. While the Ultra Hdmi 64 mod is just now out (and looks amazing), I am still perfectly content with RGB. I don't have a CRT, but wouldnt mind one in the future, and the hdmi route will obviously not cover that.

 

This needs correction: I have been using my n64 rgb modded with composite as sync and wanted to upgrade it to use c-sync. My motherboard revision is NUS-CPU-04.
I did cut the trace for pin 9 and wired it to pin 3 and got no picture.
As far as I can tell, there's no csync on this board.

I've seen people using luma for sync in this n64 revision.

If anyone has any information how to add csync to the multi out of the N64 rev 4, I can test here and post the results.

 

Do you mean my post needs correction or yours?

You can get C-Sync by tapping it off the DAC. What you did doesn't send anything down that pin and removes the composite video output from the Multi-Out.

As for getting C-Sync from the DAC, try connecting pin 14 of the VDC-NUS (marked U4 on the mobo) chip to Multi-Out pin 3 using a 680K ohm resistor.

EDIT: Did not catch that you said you cut the trace for pin 9 for some reason. Fixed my post after reading it again.

 

Its not sending composite video down the csync pin, as hes cut composite video.

 

Ah my bad, I didn't catch that for some reason. I'll edit my post.

 

Haven't tested this myself but I've read in several places that Pin 14 output c-sync in a not standard way - not buffered if I'm not mistaken - and so this is useless.

My guess is that the best method for pure sync out of the N64 rev 4 is LM1881 on the composite video side or using luma for syncing.

 

That's why you need the 680K ohm resistor. There was a guide showing all of this in the first post of this thread.

 

Yeah, thats not the correct way to do it either. The retrorgb page even says as much.