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Early multisync monitors designed for use with systems having a small number of specific frequencies, like CGA, EGA and VGA, or built-in Macintosh graphics, supported limited fixed frequencies. On the IBM PC, these were signaled from the graphics card to the monitor through the polarities of one or both H- and V-sync signals sent by the video adapter.<ref name=":0" />
Later designs supported a continuous range of scan frequencies, such as the NEC Multisync which supported horizontal scan rates from 15 to 31 kHz<ref name=":1" /> derived from the sync signal timing rather than the polarity of the sync signals.<ref>{{Cite web|title=PC Mag 1987-03-31 : Free Download, Borrow, and Streaming|url=https://archive.org/details/PC-Mag-1987-03-31|access-date=2020-08-16|website=Internet Archive|date=31 March 1987 |language=en}}</ref> Displays like these could be used on multiple platforms and video cards as long as the frequencies were within range.
Modern monitors produced using the VESA frequency standards generally support arbitrary scan rates between specific minimum and maximum horizontal and vertical rates. Most modern multiscan computer monitors have a minimum horizontal scan frequency of 31 kHz.<ref>{{Cite web|title=Converters {{!}} RetroRGB|url=https://www.retrorgb.com/converters.html|access-date=2020-08-16|language=en-US}}</ref>
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