In 1987, the Amiga 2000 was released, still featuring a MC-68000 CPU, but this time with 4 custom chips (Agnus, Denise, Paula, Gary). It also shipped with 1MB RAM (which was expandable to 9MB) and a disk drive that could store 880KB on a double-sided, double-density 31/2 disk. The A2000 had a number of slots inside its big-box case, including Zorro-II (the expansion bus) slots, ISA slots, a dedicated video slot, and a processor slot. The Kickstart operating system was embedded in ROM, eliminating the need for a separate disk to boot the machine. A2000 was the basis for other Amigas, being released in various world markets as the A1500 [A2000 with two 3 1/2" drives], A2000HD, A2500/20, A2500/30, A2000HDA/100, A1500 plus and A2000Plus.
The Amiga 500 was also released in 1987, and sold for £359.90 in the UK, making it the first affordable Amiga. It was technically very similar to the A2000, but it only had one expansion slot at the side of the keyboard-like case. It featured a new graphics mode (OCS - Original Chip Set), capable of display 64 colors simultaneously.
The operating environment was upgraded to Workbench 1.2, which also shipped with the last of the A1000s. This version improved AutoConfig and stability, refined graphics a bit (icons were not visible when dragged), and the RAM: disk appeared. This provided a virtual disk drive in memory, which reduced disk swapping.
In 1988, Atari took Commodore to court, claiming that the company gave money to them to research the Amiga and owed them a share of profits, but Commodore won the lawsuit.
In 1989, there were minor changes to the Amiga's custom chipsets. For example, as Agnus was improved, it was renamed "Fat Agnus", and eventually "Fatter Agnus", as the chipset could control 1MB Chip RAM up from the original 512K.
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