Source: https://wiki.nesdev.com/w/index.php?tit ... rs#PPUMASKBit 5 emphasizes red on the NTSC PPU, and green on the PAL & Dendy PPUs.
Bit 6 emphasizes green on the NTSC PPU, and red on the PAL & Dendy PPUs.
But it looks like none of the most popular emulators (fceux, Nestopia, Nintendulator) implements the PAL switch.
I made a little test program where I can go through all eight emphasize values with the d-pad. And no matter if I set the emulator to PAL or NTSC (of course, I do a hard reset after switching the region if the emulator doesn't already do it itself), the first value is always the red tint. PAL and NTSC behave identically.
So, is this a thing that all the emulators missed to implement? Or is this an error in the wiki? Or am I misunderstanding anything here?