The Amiga is a family of personal computers introduced by Commodore in 1985. The original model is one of a number of computers with 16- or 32-bit processors, 256 kB or more of RAM, mouse-based GUIs, and significantly improved graphics and audio compared to previous 8-bit systems. This includes the Atari ST – released earlier the same year – as well as the Macintosh and Acorn Archimedes. Based on the Motorola 68000 microprocessor, the Amiga differs from its contemporaries through the inclusion of custom hardware to accelerate graphics and sound, including sprites and a blitter, and a pre-emptive multitasking operating system called AmigaOS.
The Amiga 1000 was released in July 1985, but production problems kept it from becoming widely available until early 1986. The best-selling model, the Amiga 500 was introduced in 1987 (along with the more expandable Amiga 2000). The Amiga 3000 was introduced in 1990, followed by the Amiga 500 Plus, and the Amiga 600 in March 1992. Finally, the Amiga 1200 and the Amiga 4000 were released in late 1992. The Amiga line sold an estimated 4.85 million units during the late 1980s to early 1990s. (From Wikipedia)