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The SGI O2 has a standard VGA port, but when I connect it to a CRT computer monitor, I do not get a signal. Do I need a specific kind of monitor in order to use the O2?

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It needs to be sync-on-green capable (any good monitor should have this mentioned in the specs).

But even then you may have issues, I have a few O2's and I have observed that sometimes one of my monitors (Dell U2410, SOG capable) really distorts the colors (towards green), replugging the cable solves the issue. I had no issues with an Octane with 13W3->VGA cable.

There are devices on the market that can help, called sync stripper - such device could remove the sync signal from green channel and put it on the regular VGA sync line, but it might be cheaper to buy an old 15-17 inch monitor that supports SOG by default. (O2 won't do anything more than 1600x1200 without extreme tweaks anyway).

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    Note that "no signal" may mean a problem other than lack of sync-on-green support. IIRC, the O2 output both SOG and standard sync, so a monitor that does not support SOG usually reacts by tinting the whole image green, rather than by not displaying anything. – Mark May 20 '16 at 1:44
  • @Kuba, does a 240p/480i signal on your U2410 (such as from your C64) look better with or without the XRGB-Mini? Could you explain the difference in what you see? – traal May 20 '16 at 5:59
  • @traal No, it looks worse for a few reasons - U2410 doesn't have s-video so I have to use composite. The picture is stretched to the full size (1920x1200 at 16x9). – Kuba Tyszko May 20 '16 at 7:29

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