There are a few different kinds of sync signals that exist . For the kind you commonly see for retro gaming RGBS , you typically have Composite sync csync or clean sync the horizontal and vertical sync signals combined into one signal and sent all by themselves as a standalone signal . This is generally the most desirable . Sync on composite video The composite video signal is used for sync . It ' s basically like taking the brightness luma , the colour chroma and the sync , and combining them all in one signal . This is how composite video normally works . The downside is that over the length of a cable , the chroma part of the composite video signal can couple in to the RGB lines and cause interference . This is undesirable . Also , some devices like Extron devices only support csync . Sync on luma The luma the green wire in component video , or one of the two signals in SVideo is used for sync . This tends not to cause interference , so it ' s normally fine to use , as long as you don ' t have any devices that require csync . There are some other sync types , such as separate sync RGBHV , used for VGA and syncongreen RGsB , sometimes used for VGA too , but those are less common in retro gaming . Anyhow , the reason why you only have certain sync types on certain consoles is because not all consoles output csync . For example , the SNES ' s output connector has a csync pin , but the Playstation does not . The Playstation does support SVideo , however , so you can use the luma pin on the playstation output for sync . It ' s the best quality sync available from the Playstation . Some consoles don ' t even have that , forcing you to use their composite video output for sync . One thing to understand is that SCART cables only have one pin that is used for sync the composite video pin actually , so no matter what sync type you ' re dealing with , the signal is going to get connected to that pin . That ' s why something confusing like sync on luma and composite sync can work on the same device , because it ' s different signals being connected to the same pin . An important note on sync strippers these are devices that will strip off everything but the sync from the signal , resulting in csync . However , this does nothing to avoid interference , because these sync strippers are normally installed in the SCART plug part of the cable , all the way at the end , after the signals have already gone down the wire causing interference . The only thing that a sync stripper is good for is connecting to a device that can only support csync .