Difference between revisions of "Palettes"

From NeoGeo Development Wiki
Jump to: navigation, search
m (7 revisions: Import from wikkii)
(No difference)

Revision as of 16:27, 26 June 2011


There are 2 banks of 256 palettes of 16 colors available, made of 16bit RGB definitions. Palettes are located at $400000 in the 68k's memory map.

The bank used for video output is set by registers REG_PALBANK1 ($3A000F) and REG_PALBANK0 ($3A001F).

Only one bank can be used at a time. They can be switched by using register ???

Color definition word: D R0 G0 B0 R4 R3 R2 R1 G4 G3 G2 G1 B4 B3 B2 B1

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Def Dark bit R0G0B0R4R3R2R1G4G3G2G1B4B3B2B1

Sprite tiles can use any of the 256 palettes, while fix tiles can only use the 16 firsts.

Max colors on screen without RLI tricks: 256*16=4096 out of 2^16=65536.

Palettes are stored in Palette RAM.

Last color of palette bank: backdrop color. First color of palette bank: reference color for the video output (during H and V blank ?). Has to be $8000 (black).