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The Agnus is the Address Generator Chip. Its main function, in chip area, is the RAM Address Generator and Register Address Encoder which all DMA addresses.
The 8361 Agnus is made up of approximently 21000 Transistor s and contains DMA Channel Controllers. The Blitter and Copper are also contained here.

Agnus features:
  • The Blitter , a Bitmap image manipulator. The Blitter is capable of copying blocks of display data at high speed, while freeing the CPU for concurrent tasks.

  • " Copper " a display synchronized co-processor.

  • 25 Direct Memory Access (DMA) channels, allowing graphics, sound and I/O to be used with minimal CPU intervention.

  • DRAM refresh controller.

  • Memory controller (Memory that can be accessed by the processor and the chipset)

  • Generates the system clock from the 28 MHz oscillator

  • Video timing.


Agnus was replaced by Alice in the Amiga 4000 and Amiga 1200 when the AGA chipset was introduced in 1992.


CHIPS BY CAPABILITY





  • Somewhere 8372A Agnus mentioned as simply "8372".



CHIPS BY PACKAGE


  • 48-lead DIP Agnus (aka '''thin Agnus'''): 8361; 8367


  • 84-contact PLCC Fat Agnus (sometimes on the motherboard named as '''Fat Lady''') 8370; 8371; 3872; 8372A; 8372AB; 8372B; 8375


Notes
'''Fat Agnus 1MB''' and '''Fat Agnus 2MB''' usually known as Super Agnus; Super Fat Agnus; Fatter Agnus; Big Agnus; Big Fat Agnus; Super Fat Agnus, but these aren't official names.


Sources