Lawfer wrote:For cables, I use Retro Access BNC Cable for Nintendo 64 RGB Mod plugged directly on my broadcast monitor, it's pretty much the same Retro Access BNC cables and same monitor that I use for my other consoles which have normal white level brightness.
That's a similar setup to mine (except I use DE15 instead of BNC). Do you know that your BNC cables do not have any resistors on them? I know mine don't. Back when whites/colors appearing duller via RGB for some people were being discussed, Borti mentioned this:
White is white - all bits in the digital color vectors are set to one here. In the digital way there is no way to further 'boost' them.
What you can try to do with viletims board:
If you have caps inside your RGB cable, just remove them. They are not needed and may reduce the contrast a bit.
Also, you have R49, R50 and R51 on viletims board. These are 270 ohm resistors, which are unfortunately not labeled but luckely the only 270ohm ones.
These resistors together with the R2R ladder gives a Upp of 0.696V, which is below standard (0.714V in US) but normally close enough.
You can replace them with 280ohm resistors which gives you 0.716V.
If you want to overshoot the standard a bit more to saturate earlier, you may also want to use 290ohm or 300ohm resistors (giving you Upp=0.756V)
You can find further discussion in this topic starting from page 30 especially:
viewtopic.php?f=6&t=56988&start=870
Doing a quick search for "white" you'll find a bunch of references to it, with someone being able to match their N64 RGB white to other consoles as well as S-video after calibrating the monitor, while others being unable to do so. In my case I double checked by comparing the white screen of the 240p test suite on the N64, Megadrive/Genesis, and even a 1Chip SFC. I didn't measure anything with an osciloscope or probe so nothing scientific, but to my eye the N64 whites look as intense. I also dug out an S-video cable and compared it and white is the same, not dull or grayish whatsoever.
Another potential factor to consider besides resistors on the cable, or something else on the chain, are the settings on the N64 Advanced board. My settings for reference:
Output format: RGBS/RGsB
240p-DeBlur: Always
15bit mode: Off
Gamma Value: 1.0
Linedoubling off, no filter bypass
So pretty confident the N64Advanced board doesn't have the problem you mentioned inherently, but it would be good if someone else besides us two can share experience with it.