Agnus

This chip contains many functions and is the "hub" of the chipset.

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It contains the Blitter, the Copper, and controls DMA traffic between the other chips and memory, specifically chipmem and slowmem. Fastmem is available only to the CPU.

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It comes in various versions supporting 0.5, 1, and 2MB chipmem, but they are programmed the same way - you access f.ex. the Blitter or Copper inside the chip via the same custom chip registers.

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In AGA Amigas, the corresponding chip is called Alice.