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The Original Chip Set (OCS) is a chipset used in the earliest Commodore Amiga computers and defined the Amiga's graphics and sound capabilities. It was succeeded by the slightly improved Enhanced Chip Set (ECS) and the greatly improved Advanced Graphics Architecture (AGA).
All Amiga computers use two 8520 CIAs (Complex Interface Adapter) for peripheral interfacing and the system timers, except for the CD32, where these functions are performed by the Akiko chip. The CIA chips were also used in some other Commodore devices. 'Even' CIA functions: floppy control, serial control, some parallel port status
The Amiga's Original Chip Set, code-named Lorraine, was designed by the Amiga Corporation during the end of the first home video game boom. Development of the Lorraine project was done using a Sage IV machine nicknamed "Agony" which had 64-kbit memory modules with a capacity of 1 mbit and a 8 MHz CPU .
First desktop Amiga with internal expansion slots used the Amiga 1000 chipset 512 KB Chip RAM, 512 KB Fast RAM on CPU slot card Amiga 500: 1987–1991 68000 512 KB 1.2 – 1.3 3.1 / 3.2 First "low-end" Amiga; later A500s shipped with 1 MB memory Amiga 2000: 1987–1992 68000 1 MB: 1.2 – 2.04 3.9 / 3.2
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The 1990 third-party Video Toaster made the Amiga a comparatively low cost option for video production. In later years, the Amiga started losing market share to IBM PC compatibles and video game consoles, eventually leading to Commodore's bankruptcy in 1994 and then the end of Amiga. Commodore is estimated to have sold an 4.85 million Amigas.
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This category, and its subcategories, categories all articles relating to the Amiga computer platform, including hardware, software, people involved in its development, etc. Wikimedia Commons has media related to Commodore Amiga .