What does one call the area of memory a processor can reach without indirect addressing? What inportance does it hold for the computer graphic programmer?

One call the area of memory a processor can reach without indirect addressing .Importance  it hold for the computer graphic programmer : 

The page of memory a processor can reach with direct addressing is called the zero page. The zero page is important to the graphics programmer because no indirect addressing is required in order to read or write to that area of memory. Since indirect addressing takes longer than direct addressing, data in the zero page can be operated om more rapidly.

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