SpritesMind.Net

You could also trade resolution for speed by halving vertical resolution:
* Either render at halved vertical resolution, then DMA that to the VDP, then reduce vscroll by 1 every 2nd row so the plane is stretched vertically by a factor of 2.
* Or DMA the gfx with a transparent line between each ...

Yeah i know it is simplistic combinations but still sometime i really have hard time to figure them :p
Anyway thanks for the link, that would help me in future ;)
If you ever lose the link, just remember "permutations calculator" and it should come up in top search results. (there's a few other ...

About the sound: i made the song with tfm music maker and the 68000 is used to play the music with a tfc replayer that i made in asm, but using only 5 channels, thus i use the sixth channel to make two-channel samples with the z80. The samples are compressed 2 to 1 and is played directly in the z80 ...

For 16 colors, the maximum number of unique combinations (including 2 of the same color -ie the base 16 colors) would be 136, not 128. Though depending on the palette actually chosen (and the colors trying to be approximated) you can get as few as 64 useful psudo colors. (it's also limited to 120 ...

I guess a single plan (and so a single 16 colors palette) can be enough as pixels are always rendered in 2 pixels chunk so you fake more colors (128 actually) by blending these 2 H pixels... We just need to take a good base palette to allow at good representation of the original 256 colors palette ...

I guess a single plan (and so a single 16 colors palette) can be enough as pixels are always rendered in 2 pixels chunk so you fake more colors (128 actually) by blending these 2 H pixels... We just need to take a good base palette to allow at good representation of the original 256 colors palette ...