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To this day you can buy passive cables which separate out S-Video and composite signals from VGA. There's always a warning to check whether your graphics adapter output these over the VGA connector. While I have seen a number of video cards which had a separate S-Video connector, up to the ATI HD 3650 and the Geforce 6200 but I have never in my life seen or heard of a card which outputted S-Video over VGA. Anyone...?

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Some Matrox cards output composite and S-Video using the HD15 port; for example, the G450 PCI (see the TV output chapter in its manual). The adapter cable was optional though and isn’t commonly included with the graphics adapter.

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    I'll be damned, you are right. I thought of something much more obscure, maybe some ATI All In Wonder card. Cable: cablesonline.com/svidrcavidou.html Pinout: allpinouts.org/pinouts/cables/audio_video/…
    – chx
    Apr 20, 2017 at 10:15
  • Yes, I thought of the AIWs as well, but I think they had separate ports for composite and S-Video, sometimes with break-out cables, but not combined with the VGA port (although this suggests I’m wrong about that). Apr 20, 2017 at 10:55
  • @StephenKitt That diagram you linked seems to be connecting a CGA digital DE-9 connector to the analogue RGB pins of a SCART connector. I'm not sure that would actually work, but it's not an example of VGA port outputting a composite or S-Video signal.
    – user722
    Apr 22, 2017 at 5:37
  • @Ross the diagram is wrong, look at the list of pins. There never were Radeon cards with CGA-style connectors. Apr 22, 2017 at 9:09
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    Online PDF, see chapter about TV output: matrox.com/graphics/media/pdf/products/graphics_cards/g_series/…
    – Stavr00
    Oct 15, 2019 at 14:04

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