The Amiga architecture is based on custom chips that work in parallel with the CPU: Agnus/Alice (DMA controller, Blitter, Copper), Denise/Lisa (graphics output, sprites, collision detection), Paula (4-channel audio, floppy I/O, interrupts). The Copper is a display co-processor that can change graphics line by line (Copper lists). The Blitter copies/fills/combines memory blocks faster than the CPU. DMA channels share Chip RAM access in a timeslot scheme. This architecture was revolutionary in 1985 and enabled multimedia capabilities that PCs only offered years later.