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A '''multiple-sync''' ('''multisync''') '''monitor''', also known as a '''multiscan''' or '''multimode''' monitor, is a [[Raster scan|raster-scan]] [[analog device|analog]] video [[Computer display|monitor]] that can properly [[Synchronization|synchronise]] with multiple [[Horizontal scan rate|horizontal]] and [[Vertical synchronization|vertical]] [[Vertical scan rate|scan rate]]s.<ref>{{cite web|title=13 What's the difference between fixed frequency and multisynchronous monitors?|url=http://stason.org/TULARC/pc/video-faq/13-What-s-the-difference-between-fixed-frequency-andmultisynchronous-monitors.html}} 070808 stason.org</ref><ref>{{Cite web|last=|first=|date=|title=Standards FAQ|url=https://vesa.org/vesa-standards/standards-faq/|url-status=live|archive-url=|archive-date=|access-date=2020-08-16|website=VESA - Interface Standards for The Display Industry|language=en-US|quote=Multimode monitors can measure the incoming sync signal frequencies and thus sync to any frequency within their range of operation.}}</ref> In contrast, fixed frequency monitors can only synchronise with a specific set of scan rates. They are generally used for computer displays, but sometimes for television, and the terminology is mostly applied to [[Cathode-ray tube|CRT displays]] although the concept applies to other technologies.
Multiscan computer monitors appeared during the mid 1980s, offering flexibility as computer video hardware shifted from producing a single fixed scan rate to multiple possible scan rates.<ref>{{cite web|title=MultiSync 25th Anniversary{{Snd}} The Evolution of the MultiSync|url=http://www.nec-display.com/ap/en_display/25th/}}</ref> "MultiSync" specifically was a trademark of one of [[NEC|NEC's]] first multiple-sync monitors.<ref name=":1" />
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