One computer capable of producing an interlaced image is the Amiga. The Amiga's default video mode is PAL or NTSC. NTSC and PAL interlaced screens have two fields called odd and even. The fields switch every 60th of a second on NTSC, or 50th of a second on PAL, which allows for higher resolution while using a narrower signal bandwidth than full 50 or 60 FPS progressive video would require, but it can also produce an alarming jittering effect for graphics with high contrast details between fields. This NTSC/PAL compatibility gave the Amiga a distinct edge in uses such as television production and gaming, but since the original Amigas were unable to produce vertically high-resolution displays without flickering this was unsuitable for office-like usage where one might need to work with a clear high-resolution image for several hours. Flicker fixers were devised to remedy this.
The later iteration of the Amiga - the Amiga 3000 had a custom chip called Amber which could perform flicker-fixing on any signal. The ECS and AGA chipset could also output VGA display modes. Commodore offered the A2320 Display Enhancer Board for this purpose,[1] The board fit neatly in a video graphics adapter slot on the A2000 series computer. It supported the new video modes offered by the Enhanced Chip Set (ECS) and AmigaOS 2.0, including the Productivity Mode. Also, the earlier A2024 'Hedley' greyscale monitor featured an integrated flicker fixer, supporting up to 8 shades of grey.
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