Hello everyone, today I stumbled on a undocumented feature I didn't know existed: 16 extra colors.!
I searched on the wiki and the forums and I didn't see it mentioned anywhere (except this thread, but it was a differnt thing and that feature was removed by zep at that time).
If you change the screen palette via poke (0x5f10 to 0x5f1f) to a value above 0x80, the color will change as shown below:
Here's world 2 of Jack of Spades with all colors swapped, except black and yellow:
Original colors for comparison:
You can't have more than 16 colors in a single frame though, since poking (0x5f00 to 0x5f0f) will just make the color transparent, as documented in the wiki. Still it's good for fades, and can be used for someting like stage-specific palettes like in the NES and other old consoles.
@BoneVolt Are you sure?
(UPDATE: Looks like it's just PAL swapping with the extended palette - Zep just used all the available blues from both palettes)
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