SYS file

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SYS files hold palette and sprite data for the game logo displayed in the CDZ menu screen. There's one file for each nationality:

TITLE_J.SYS
TITLE_U.SYS
TITLE_E.SYS

Palettes are stored first, there's space for 45 of them ($5A0 bytes). Following that are 45 sprite tiles in the regular SPR file format, making a 9*5 tiles (144*80 pixels) logo. Tiles are mapped from left to right, top to bottom.

(See cdrom_load_title in cdrom.c of NEOCD 0.31).

TITLE_*.SYS file is loaded into memory at $127800 and takes up $1C20 bytes ($5A0 45 palettes + $1680 45 sprite tiles)

If you overwrite this area of memory when you return from the game to the bios main menu it will corrupt:

SYS file

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