Amiga Advanced Graphics Architecture: Difference between revisions

Revision as of 00:32, 27 August 2019

Revision as of 00:33, 27 August 2019

Line 7:

'''Amiga Advanced Graphics Architecture''' ('''AGA''') is the third-generation [[Amiga]] graphic chipset, first used in the [[Amiga 4000]] in 1992. Before release AGA was codenamed '''Pandora''' by [[Commodore International]].

AGA was originally called '''AA''' for '''Advanced Architecture''' in the United States. The name was later changed to AGA for the European market to reflect that it largely improved the graphical subsystem, and to avoid trademark issues.<ref>[{{Cite web|url=http://www.amigahistory.co.uk/amigaaga.html|title=Amiga TheHistory Guide|website=Amiga AGA Chipset]History}}</ref>

AGA is able to display graphics modes with a depth of up to {{nowrap|8 bit}}s per pixel. This allows for {{nowrap|256 colors}} in indexed display modes and {{nowrap|262,144 colors}} (18-bit) in [[Hold-And-Modify]] (HAM-8) modes. The palette for the AGA chipset has 256 entries from {{nowrap|16,777,216 colors}} (24-bit), whereas previous chipsets, the [[Original Chip Set]] (OCS) and [[Amiga Enhanced Chip Set|Enhanced Chip Set]] (ECS), only allow {{nowrap|32 colors}} out of 4096 or 64 colors in Amiga [[Extra Half-Brite]] (EHB mode). Other features added to AGA over ECS are super-hi-res smooth scrolling and 32-bit fast page memory fetches to supply the graphics data bandwidth for 8 bitplane graphics modes and wider [[Sprites (computer graphics)|sprites]].