Original Amiga chipset

From Open Circuits

The Original Chip Set (OCS) is the chipset used in the earliest Commodore Amiga computers and defined the Amiga graphics and sound capabilities. It was succeeded by the slightly improved Enhanced Chip Set (ECS) and greatly improved Advanced Graphics Architecture (AGA).

The original chipset appeared in the Amiga 1000, Amiga 2000 and Amiga 500.