Editing Flicker fixer (section)

== Use with the Amiga ==

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 (signal processing)|bandwidth]] than full 50 or 60 [[frame rate|FPS]] progressive video would require, but it can also produce an alarming [[jitter]]ing 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 [[computer game|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 [[Amiga custom chips#Amber|Amber]] which could perform flicker-fixing on any signal. The [[Enhanced Chip Set|ECS]] and [[Advanced Graphics Architecture|AGA]] [[chipset]] could also output VGA display modes. Commodore offered the A2320 Display Enhancer Board for this purpose,[https://web.archive.org/web/20110517230430/http://amiga-hardware.com/showhardware.cgi?HARDID=360] The board fit neatly in a video graphics adapter slot on the A2000 series computer. It supported the new video modes offered by the [[Amiga Enhanced Chip Set|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.

An alternative is a screen cover. [[Jerry Pournelle]] reported in 1989 that Flicker Master, "a screen that you Velcro over your Amiga monitor ... reduces the flicker from interlace mode something wonderful ... I wouldn't be without it".<ref name="pournelle198902">{{Cite magazine |last=Pournelle |first=Jerry |date=February 1989 |title=Ready Line Overload |url=https://archive.org/details/eu_BYTE-1989-02_OCR/page/n175/mode/2up?view=theater |access-date=2024-10-08 |magazine=BYTE |pages=121-137}}</ref>