Advanced Graphics Architecture (AGA) was the name used for the improved graphics chipset of the third generation Amiga computers at the beginning of the 1990s. Second generation had ECS. In computing, Amiga is a range of home/personal computers primarily using the Motorola 68000 processor family, whose development started in 1982, initially as a game machine. ... Jump to: navigation, search // Events and trends The 1990s are generally classified as having moved slightly away from the more conservative 1980s, but otherwise retaining the same mindset. ... Enhanced Chip Set (ECS) is the name used for the enhanced version of the Amiga computers original chipset (OCS). ...

AGA is able to do 8-bit (256 colors) in normal display mode and 262144 colors in Hold-And-Modify (HAM) mode (18-bit color, 6-bit per RGB channel). Palette for AGA chipset is 16777216 colors (24-bit). The original Amiga chipset (OCS) had 4096 colors (12-bit, 4-bit per RGB channel), of which 32 could be displayed unless in half-bright (which provided an additional 32 colors fixed at half the brightness of the first 32) or HAM mode. Other features added to AGA over ECS were superhires smooth scrolling and 32-bit memory fetches to supply the graphics data bandwidth for 8 bitplane graphics modes. Hold-and-Modify (more commonly known as HAM) is a screenmode of the Amiga micro computer. ... The RGB color model utilizes the additive model in which red, green, and blue light are combined in various ways to create other colors. ... Jump to: navigation, search The Commodore Amiga Original Chip Set (OCS) is a chipset used in the earliest Amiga computers, from the 1985 Amiga 1000 onwards. ... The RGB color model utilizes the additive model in which red, green, and blue light are combined in various ways to create other colors. ...

Unfortunately many opportunities to add further improvements, which would have made the chipset more competitive, were missed. Apart from the graphics data fetches the chipset still operates on 16-bit data only, meaning that a lot of bandwidth is wasted during register accesses and copper and blitter operations. Also the lack of a chunky graphics mode was a speed impediment to graphics operations not tailored for planar modes. Over all the AGA chipset was a basic evolutionary upgrade that could not compensate for years of technical progress that the Commodore Amiga took little part of. In chunky or packed pixel frame buffer organization, the bits defining each pixel are grouped together. ... Jump to: navigation, search Something is called planar if it is made up of flat planes, or pertaining to planes. ...

AGA was included in the CD32, Amiga 1200 and Amiga 4000. The AmigaCD32 was the first 32bit CD-ROM based game console. ... The Amiga 1200, or A1200, was Commodore Internationals third-generation Amiga computer, aimed at the home market. ... The A4000, or Commodore Amiga 4000, was the successor of the A2000 and A3000 computers. ...

See also

• ECS
• OCS