nv_dac2_palette
if (nv_dac2_palette(r,g,b) != B_OK) return B_ERROR;
head1_palette = (dac_palette) nv_dac2_palette;
head2_palette = (dac_palette) nv_dac2_palette;
status_t nv_dac2_palette(uint8 r[256],uint8 g[256],uint8 b[256]);