Compatible RGB PPUs

[thefox]

I can't imagine any situation that would screw with generating the color waveform. Wouldn't the color it intends to draw be latched and fixed somewhere by the time it reaches that point? Even if there was some writes to 2007 or something messing with the palette, I don't think it would interrupt pixel generation.
Does changing color emphasis interrupt pixel generation?

Not pixel generation, but rogue writes might make FPGA's shadow palette out of sync with what NES has.

[Drakon]

Devices that can reconstruct the video signal into a higher quality signal without the issues that come with NTSC Composite Video is a good thing. As others stated the functionality of the NES and from the point of view of the software running is identical to if you had no device attached to the PPU at all. Afterall, you're just spying to recreate the video signal. You aren't interfering with the operation of the system.

I never said it's a bad thing.

[mikejmoffitt]

Devices that can reconstruct the video signal into a higher quality signal without the issues that come with NTSC Composite Video is a good thing. As others stated the functionality of the NES and from the point of view of the software running is identical to if you had no device attached to the PPU at all. Afterall, you're just spying to recreate the video signal. You aren't interfering with the operation of the system.

I never said it's a bad thing.

Okay, but to compare it to an emulator is very far off the mark.

[MottZilla]

Your comment seemed to imply that it was a bad thing. I think it's a cool way to improve video quality for those bothered by Composite Video particularly on Digital TVs. Though for me personally the stock original model NES works great for me.