The Amiga 2000 is a desktop computer released by Commodore in 1987, featuring a distinctive "big box" tower-style case that distinguished it from the integrated keyboard designs of the Amiga 500. It introduced the Zorro II expansion bus with five slots, allowing extensive hardware upgrades including CPU cards, graphics cards, and Bridgeboards for PC compatibility. The A2000 was designed for professional and power users, featuring internal drive bays, a battery-backed real-time clock, and typically shipped with 1 MB of RAM and the Original Chip Set (OCS), though later revisions included the Enhanced Chip Set (ECS).