Content deleted Content added
subcat |
No edit summary |
||
Line 11:
AGA was an incremental upgrade, rather than the dramatic upgrade of the other chipset that Commodore had begun in 1988, the [[Amiga Advanced Architecture chipset]] (AAA), lacking many features that would have made it competitive with other graphic chipsets of its time. Apart from the graphics data fetches, AGA still operates on 16-bit data only, meaning that a lot of bandwidth is wasted during register accesses and [[Original Chip Set#Copper|Amiga 'copper']] and [[blitter]] operations. Also the lack of a [[packed pixel|chunky]] graphics mode is a speed impediment to graphics operations not tailored for [[Planar (computer graphics)|planar]] modes, resulting in ghost artifacts during the common productivity task of [[scrolling]]. In practice, the AGA HAM mode is mainly useful in painting programs, picture viewers and for video playback. Workbench in 256 colors is much slower than [[Amiga Enhanced Chip Set|ECS]] operation modes for normal application use; a workaround is to use multiple screens with different color depths. AGA lacks flicker free higher resolution modes, being only able to display {{nowrap|640 × 480}} at {{nowrap|72 Hz}} flicker-free operation. {{nowrap|800 × 600}} mode is rarely used as it can only operate at a flickering {{nowrap|60 Hz}} interlaced mode. In contrast, higher-end PC systems of this era can operate {{nowrap|1024 × 768}} at {{nowrap|72 Hz}} with a full 256-color display. AGA's highest resolution is {{nowrap|1440 × 580}} {{nowrap|(262 144 colors)}} in interlaced {{nowrap|50 Hz}} {{nowrap|PAL mode,}} when overscan is used.
These missed opportunities in the AGA upgrade contributed to the [[Amiga]] ultimately losing technical leadership in the area of [[multimedia]]
AGA is present in the [[Amiga CD32|CD32]], [[Amiga 1200]] and [[Amiga 4000]].
| |||