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The NES graphics processor (PPU) does not generate RGB in any way. Rumor has it that it's possible to install a PPU chip from a Vs. NES or Playchoice-10 arcade board, but apparently those chips sometimes display incorrect colors (NES uses a very clever/cheap method to generate colors that has some interesting side effects).
I haven't tried it, but as far as I know NTSC games should play in color, and will have slowdown. I would expect that there will be some kind of border, possibly garbage-filled, but I'm not really sure about the details. |