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March 14, 2016 AT 3:03 pm

NES Graphics Explained #NES #NinjaGaiden

ninjas-in-field

However, most games can’t afford to spend their time waiting in loops, especially during action scenes where CPU time is precious. For these cases, special hardware (called a mapper, because it uses its own memory mapping) is in the carts which can retrieve notifications when a certain scanline occurs removing the need to have wait loops at all. The game code can do whatever task it wants, whenever it wants, resulting in better cpu utilization.

train-level

Notice that all of the different moving sections occupy strict horizontal bands; that is, none of the background layers overlap each other. This is a consequence of the fact that splits are made by changing the scroll at individual scanlines.

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