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→Key features: the NTSC PPU does not output 256x224! It outputs 256x240, but the television set itself covers up the top and bottom 8 scanlines |
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The PPU is controlled via eight [[Processor register|registers]] visible in the [[CPU]]'s address space in the addresses $2000 through $2007. All data and information is passed to the PPU through these, except the raw tile data, which is hardwired to the PPU's address space. The PPU uses the tile graphics data together with information stored by the program in the PPU's RAM, such as color and position, to render the final graphical output to the screen.
The lowest graphical components the PPU operates with are [[tile]]s, which are blocks of 8×8 or 8×16 pixels. The tiles are stored in a [[Read-only memory|ROM]]
Essentially, the PPU supports two different kinds of objects: movable (sprites) and non-movable (background). Both kind of objects are basically a tile, and moreover a sprite and background object can use the same tile. The difference is that a tile used as a sprite can move around, whereas a tile used as a background cannot.
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