 These support chips are controlled via a series of registers that can be user-controlled via memory load/store instructions running on the 6502.For example, the GTIA uses a series of registers to select colors for the screen; these colors can be changed by inserting the correct values into its registers, which are mapped into the address space that is visible to the 6502.Some of the coprocessors use data stored in RAM, notably ANTIC's display buffer and Display List, as well as GTIA's Player/Missile (sprite) information.