Designing a better S-Video mod, also maybe YPbPr

[keithcourage]

I'm not sure what is inside the cables but using both the RetroVision or Retrogamingcables Megadrive Component cables both look fantastic paired with a RGB modded PC Engine.

[turboxray]

Bump:

keithcourage: I'm also interested in the old svideo mod (that uses the composite output, not RGB). Can you post that circuit? If I remember correctly, Y+C.. Y gets a pure Y signal and C actually gets Y+C right? So no Chroma interference to Luma, but luma interference on Chroma. I'm curious what that looks like. And if it's possible to use a clean Y to pull the Y interference out of the Y+C, to clean up "C".

I've been doing some tests lately with the vectorscope I recently picked up. It only handles composite and component video, but I'm able to use the retrotink RGB2COMP to compare RGB in YUV color space. I'm documenting all the characteristics of the PCE CVBS colors (there's a lot to show!), so I need a reference point. RGB works for now, I but I'd also like to get SNES and Genesis into the mix via CVBS.

SamIam discovered something about the composite output; the external resistance is a feedback mechanism to the internal generation of the other components. As in, the final phase of composite colors is the finetune circuit of the resistors coming off the pins of the VCE. While Svideo is possible, it's going to take some time to figure out what resistor values are needed for that circuit to replicate the same color characteristics of the original CVBS. And because of how that works, I'm beginning to think that YPbPr isn't directly possible using the VCE outputs (because of the mixing and feedback nature for color space generation). But now that I have a vectorscope capable of component video, I could try such a component circuit with some inline pots to see if it's possible to dial it in.