Flag to upload graphics from the Super FX buffer. Is the value positive then 0x2000 bytes are uploaded from $705800 into $5400 (i.e. the last four rows of the sprite graphics). Is the value negative then the VRAM destination is whatever is stored in $0CF9 & 0x7FE0 and the graphics come from $706800 instead. Upload size stays the same.
Set and used during level load: This one holds the Map16 tile numbers of certain objects for the current tilemap. This allows the game to place different Map16 tiles in different tilesets while using the same object.