nesdev.org

Hi!
I finally got a NESRGB from Tim Worthington in Australia and installed it on my European PAL NES (french NES).

The image quality is awesome compared to what it used to output. However, I seem to have an issue with the Video SYNC. I first tried using composite sync (labeled V on the board) and it gave me a picture with a checkerboard pattern on the background. I then switched to CSYNC (CS# on board) and it got noticeably better, but the pattern is still there (not noticeable unless you look for it).

My question is, should I be connecting the CSYNC line to ground through a 75ohm resistor? or, alternatively, should I be using sync on LUMA (labeled Y on the board)?

I have an European PAL NES and I am connecting it to my HDMI TV through an OSSC.

A few things:

On my PAL SNES I also had the checkerboard pattern when using composite sync, but after changing to SYNC on LUMA, the checkerboard pattern disappeared.

On this specific NES console I never had a checkerboard patter issue before installing the NESRGB.

Thank you in advance for your help.

alfredocalza wrote: ↑Sat Jan 04, 2020 11:41 am My question is, should I be connecting the CSYNC line to ground through a 75ohm resistor? or, alternatively, should I be using sync on LUMA (labeled Y on the board)?

In the NESRGB documentation, it says:

Tim Worthington wrote:Jumper J8 appears only on board V1.4 (NESRGB14) and later.
It is for selecting composite sync output type.
Open for TTL, short for 75 ohm (recommended).

As far as the checkerboarding ... I'm sorry, I don't know.

I also have a PAL NES with the NESRGB installed and I remember not having a 100% pixel perfect image when playing through an upscaler. Now I've been playing it exclusively on a CRT for years, though, and I don't notice any issues there.

I'm not very knowledgeable about video interferance like this, but I bet someone else would be able to help you if you posted some pictures of the issue.

lidnariq wrote: ↑Sat Jan 04, 2020 3:02 pm

alfredocalza wrote: ↑Sat Jan 04, 2020 11:41 am My question is, should I be connecting the CSYNC line to ground through a 75ohm resistor? or, alternatively, should I be using sync on LUMA (labeled Y on the board)?

In the NESRGB documentation, it says:

Tim Worthington wrote:Jumper J8 appears only on board V1.4 (NESRGB14) and later.
It is for selecting composite sync output type.
Open for TTL, short for 75 ohm (recommended).

As far as the checkerboarding ... I'm sorry, I don't know.

Ok I just shorted J8 and got much better. I did not read that part in the instructions. No more checkerboard pattern! Thanks!

Here are some pictures of my mod. I spent almost 3 vacation days doing this! lol... My wife wasn't happy about it, but we had fun playing Probotector afterwards!

more pictures on the outside of the console..

Very nice mod, but why didn't you use the existing rgb out instead of putting in that scart port? I live in sweden but bought a french nes just so that I wouldn't have to alter the case...

Well anyways, glad it worked out for you!

pwnskar wrote: ↑Tue Jan 07, 2020 2:38 am Very nice mod, but why didn't you use the existing rgb out instead of putting in that scart port? I live in sweden but bought a french nes just so that I wouldn't have to alter the case...

Well anyways, glad it worked out for you!

Hey, thanks! I'll upload some pictures later comparing the video quality before vs. after the installation. I used the scart out port because I have some premium quality male to male scart cables that I bought NOS on ebay which I wanted to use (they are all individually shielded and very high quality). Also, high quality male to male scart cables are easy to find, whereas no good quality cables are available for the French NES.

However, I do have one high quality rgb cable compatible with the French NES multi-out, but it is a cable that I built myself and it is the only one I have. Also, I did not use Tim Worthington's proposed solution of the 8pin video cable + a separate audio cable because I did not want to deal with two different types of cables.

Here are the pictures. I think they don't do justice to the big improvement on the video quality, but the kit does make a big difference in picture quality and gives you a much better gaming experience in my opinion.

alfredocalza wrote: ↑Tue Jan 07, 2020 12:39 pm Also, high quality male to male scart cables are easy to find, whereas no good quality cables are available for the French NES.

Retro-access? You may have to look under the SNES section for a multi-out one.

calima wrote: ↑Wed Jan 08, 2020 2:13 am Retro-access? You may have to look under the SNES section for a multi-out one.

Unfortunately the french NES rgb out is not the same as Nintendo's later consoles. I think the connector is mechanically the same as the FDS, unfortunately.

Bah, of course. Typical Nintendo to use non-compatible things just because. Sorry, I thought from quick googling it was the standard multi-out.

Previous info, including pinout and krzysiobal's reverse-engineered schematic: viewtopic.php?f=9&t=18861