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HD_CHR_RAM

rustynes_ppu

Constant HD_CHR_RAM 

Source 
pub const HD_CHR_RAM: u32 = u32::MAX; // 4_294_967_295u32
Expand description

chr_tile_index sentinel meaning “CHR is RAM” — the tile is keyed by its 16 CHR bytes (content) rather than by an absolute CHR-ROM tile index.