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Please note: you do not need to modify your genesis 3 for RGB when you are using a psone screen. Just pull it directly off the CXA1645M chip, in the places used in this tutorial.

http://www.gamesx.com/rgbadd/genesis3.htm

You will not need the caps and resistors unless it's being used on something other than a psone screen.

What modification needs to be done?

This one: http://www.gamesx.com/rgbadd/genesis3.htm

This just in: That's a waste of time, just pull RGB from the CXA1645 directly.

Yeah. That's what my link says if you read it.

But you don't need to do anything on that page; the RGB output is suitable for use directly off the CXA1645...

I thought it was, because I was having some trouble getting it to work on my psone screen. But thinking back on it, I do remember seeing your Genesis 3 working on a psone screen without amplification. I thinking this mod only applies when you're using it on a typical RGB monitor. I'll edit my first post to make that clear.

is that the same on a genesis 2 ?

yes