Logo file

CDZ default loading screen.

KOF 96 custom loading screen (LOGO_E.PRG).

Optional structured files consisting of an index, fix and palette data for CD loading animations.

Can't be bigger than 2kB ? (see BIOS loader routine CDM3-2 @ EDAA)

The BIOS loads these files after checking the IPL file if they are present at the CD's root, at address $120000 according to the console's nationality: LOGO_E.PRG, LOGO_U.PRG, or LOGO_J.PRG.

Other file names can be used for in-game loading screen (LOGO_BDM.PRG in KOF96 for example). How are these specified by the game ?

See install_progress_fix() and check_screen_data in neocd.c of Raine.

File format

Address	Size	Description
0	Word	Data type (known values: $0000, $0001, $0003) The 8 low bits are stored to 0x11C817 by the bios. Bit 0 - If set do not draw the internal 'NOW LOADING please wait' graphic (see picture top right). Bit 1 - If set no progress indicator is drawn. Bit 2 - If set no animation is drawn. No other bits seem to be checked by the bios. The above is true on the first IPL load only. Some games have different in-game loading graphics that do not follow the above. More information is needed on how these work (SAMSHO4 for example).
0+2	Longword	Data type 1:Fix tiles 2:Palette 3:Map 4:Map for animation ?
2+4	Longword	Absolute data start address (Starting from $120000)
...
2+*	Longword	$FFFFFFFF terminator

Fix tiles data

• Offset (longword) $4000 = tile $200
• Size (longword) $4000 = $200 tiles
• Tile data...

Like the regular fix graphics format, but byteswapped.

Palette data

• Palette number (word), the loading bar seems to use palette 0, so don't use it. Remember that fix tiles can only use the 16 first palettes.
• 16 words of color data.

Map data

• Fix address where to start mapping ($7102 is good)
• Width in tiles (word) $18
• Height in tiles (word) $0B
• Tile numbers/palettes...

Mapped left to right, top to down.

Animation map data

• Fix address where to start mapping ($7102 is good)
• Width in tiles (word)
• Height in tiles (word)
• Number of frames in animation
• Animation speed (in frames)
• Tile numbers/palettes...