Palettes adresses in CRAM

[vreuzon]

I want to use paletted sprites and paletted background (NBG1). My problem is : I can't force sprites and NGB1 to use different palettes. So :

1. Does anybody know how the palette index and the palette starting adress are related, depending on the color mode ?

2. Do you know if it is possible to simultaneously have multiple palettes for sprites ?

thanks

 

[antime]

1. Does anybody know how the palette index and the palette starting adress are related, depending on the color mode ?

The palette index make up the upper bits of the 11-bit address. The color RAM offset bits are added to the top bits of this value (color RAM mode 1 extends the address to 12 bits in the final step). See chapter 10 of the VDP2 manual. (Note that 24-bit colour palette entries are split between the two banks, see Charles MacDonald's technotes for an explanation.)

2. Do you know if it is possible to simultaneously have multiple palettes for sprites ?

Yes, you use the CMDCOLR word to specify palette.

 

[vreuzon]

thanks, antime.