I spent the better part of this afternoon addressing my Nintendo 64 RGB problem, as you may recall I had sync issues with the Nintendo 64 and my Commodore 1084.
As it turns out, there was no sync signal on pin 3 at all! I had to make a connection between pin 14 on the U4 VDC chip and pin 3 on the Nintendo 64 multi out. I had read a bunch of tutorials/guides on adding RGB output to the Nintendo 64, but no where had I read that there was a need to add the sync signal to the multi out.
I also added an RGB amp (quick and easy mmmonkey mod method (http://www.mmmonkey.co.uk/console/nintendo/ntsc_nintendo_64_rgb.htm)) and switch while the Nintendo 64 was open.
And to round the entire project off I wired up a custom RGB dongle!
Finally! Nintendo 64 RGB!
Thanks.
Edit: A couple of pictures for you folk...
(http://img200.imageshack.us/img200/9848/dsc000028be.th.jpg) (http://img200.imageshack.us/my.php?image=dsc000028be.jpg) (http://img134.imageshack.us/img134/3392/dsc000081qp.th.jpg) (http://img134.imageshack.us/my.php?image=dsc000081qp.jpg) (http://img199.imageshack.us/img199/9614/dsc000155qg.th.jpg) (http://img199.imageshack.us/my.php?image=dsc000155qg.jpg) (http://img200.imageshack.us/img200/8465/dsc000191dn.th.jpg) (http://img200.imageshack.us/my.php?image=dsc000191dn.jpg)
(http://img134.imageshack.us/img134/5049/dsc000238ij.th.jpg) (http://img134.imageshack.us/my.php?image=dsc000238ij.jpg) (http://img200.imageshack.us/img200/9079/dsc000244zo.th.jpg) (http://img200.imageshack.us/my.php?image=dsc000244zo.jpg) (http://img99.imageshack.us/img99/5530/dsc000272of.th.jpg) (http://img99.imageshack.us/my.php?image=dsc000272of.jpg) (http://img200.imageshack.us/img200/226/dsc000301ew.th.jpg) (http://img200.imageshack.us/my.php?image=dsc000301ew.jpg)