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Which expansion port are you talking about?

I cant recall what the port was... A serial port? I cant recall - but just that it was on all O2s and it was just knocking out the plastic cover to get access to it.

One of the video ports. I think digital video port.

The base model supported audio and "moose cam" (A webcam, in 1996!). If you paid extra you got video.

Oh, this was the SDI hack, but it needed a separate port expander - it was more involved than just removing a plate.

You could buy the base AV1 "analog" video I/O card and then plug an SDI expansion breakout board (I think the Miranda VIVO was the most popular) into the webcam port, instead of buying the much more expensive AV2 "digital" video I/O card.

There were two video options you could buy, with analog and digital versions, plus there were special parts to provide alternative options for display outs (by default it had sgi-style 13W3 only)

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